TY  - JOUR
AU  - Đorđević, Katarina Lj.
AU  - Markushev, Dragana K.
AU  - Popović, Marica N.
AU  - Nesić, Mioljub V.
AU  - Galović, Slobodanka
AU  - Lukić, Dragan V.
AU  - Markushev, Dragan D.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10858
AB  - In this paper, the possibility of determining the thermal, elastic and geometric characteristics of a thin TiO2 film deposited on a silicon substrate, with a thickness of 30 μm, in the frequency range of 20 to 20 kHz with neural networks were analysed. For this purpose, the geometric (thickness), thermal (thermal diffusivity, coefficient of linear expansion) and electronic parameters of substrates were known and constant in the two-layer model, while the following nano-layer thin-film parameters were changed: thickness, expansion and thermal diffusivity. Predictions of these three parameters of the thin-film were analysed separately with three neural networks. All of them together were joined by a fourth neural network. It was shown that the neural network, which analysed all three parameters at the same time, achieved the highest accuracy, so the use of networks that provide predictions for only one parameter is less reliable. The obtained results showed that the application of neural networks in determining the thermoelastic properties of a thin film on a supporting substrate enables the estimation of its characteristics with great accuracy.
T2  - Materials
T1  - Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks
VL  - 16
IS  - 7
SP  - 2865
DO  - 10.3390/ma16072865
ER  - 

@article{
author = "Đorđević, Katarina Lj. and Markushev, Dragana K. and Popović, Marica N. and Nesić, Mioljub V. and Galović, Slobodanka and Lukić, Dragan V. and Markushev, Dragan D.",
year = "2023",
abstract = "In this paper, the possibility of determining the thermal, elastic and geometric characteristics of a thin TiO2 film deposited on a silicon substrate, with a thickness of 30 μm, in the frequency range of 20 to 20 kHz with neural networks were analysed. For this purpose, the geometric (thickness), thermal (thermal diffusivity, coefficient of linear expansion) and electronic parameters of substrates were known and constant in the two-layer model, while the following nano-layer thin-film parameters were changed: thickness, expansion and thermal diffusivity. Predictions of these three parameters of the thin-film were analysed separately with three neural networks. All of them together were joined by a fourth neural network. It was shown that the neural network, which analysed all three parameters at the same time, achieved the highest accuracy, so the use of networks that provide predictions for only one parameter is less reliable. The obtained results showed that the application of neural networks in determining the thermoelastic properties of a thin film on a supporting substrate enables the estimation of its characteristics with great accuracy.",
journal = "Materials",
title = "Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks",
volume = "16",
number = "7",
pages = "2865",
doi = "10.3390/ma16072865"
}

Đorđević, K. Lj., Markushev, D. K., Popović, M. N., Nesić, M. V., Galović, S., Lukić, D. V.,& Markushev, D. D.. (2023). Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks. in Materials, 16(7), 2865.
https://doi.org/10.3390/ma16072865

Đorđević KL, Markushev DK, Popović MN, Nesić MV, Galović S, Lukić DV, Markushev DD. Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks. in Materials. 2023;16(7):2865.
doi:10.3390/ma16072865 .

Đorđević, Katarina Lj., Markushev, Dragana K., Popović, Marica N., Nesić, Mioljub V., Galović, Slobodanka, Lukić, Dragan V., Markushev, Dragan D., "Photoacoustic Characterization of TiO2 Thin-Films Deposited on Silicon Substrate Using Neural Networks" in Materials, 16, no. 7 (2023):2865,
https://doi.org/10.3390/ma16072865 . .

TY  - JOUR
AU  - Stanimirović, Ivanka
AU  - Markushev, Dragana
AU  - Stanimirović, Zdravko
AU  - Galović, Slobodanka
AU  - Đorđević, Katarina Lj.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11205
AB  - The plasma-elastic component of the photoacoustic response in the time-domain of thin semiconductor samples excited by long electromagnetic radiation pulses is analyzed in detail. The plasma-elastic component model assumes that ambipolar diffusion can be approximated by the minority carrier diffusion. The results obtained show that the plasma-elastic component in thin semiconductor samples affects photoacoustic measurements in the time domain, which is important for the photoacoustic determination of semiconductor electronic properties. © 2023 Author(s).
T2  - Journal of Applied Physics
T1  - Analysis of plasma-elastic component of time-domain photoacoustic response
VL  - 133
IS  - 23
SP  - 235701
DO  - 10.1063/5.0152713
ER  - 

@article{
author = "Stanimirović, Ivanka and Markushev, Dragana and Stanimirović, Zdravko and Galović, Slobodanka and Đorđević, Katarina Lj.",
year = "2023",
abstract = "The plasma-elastic component of the photoacoustic response in the time-domain of thin semiconductor samples excited by long electromagnetic radiation pulses is analyzed in detail. The plasma-elastic component model assumes that ambipolar diffusion can be approximated by the minority carrier diffusion. The results obtained show that the plasma-elastic component in thin semiconductor samples affects photoacoustic measurements in the time domain, which is important for the photoacoustic determination of semiconductor electronic properties. © 2023 Author(s).",
journal = "Journal of Applied Physics",
title = "Analysis of plasma-elastic component of time-domain photoacoustic response",
volume = "133",
number = "23",
pages = "235701",
doi = "10.1063/5.0152713"
}

Stanimirović, I., Markushev, D., Stanimirović, Z., Galović, S.,& Đorđević, K. Lj.. (2023). Analysis of plasma-elastic component of time-domain photoacoustic response. in Journal of Applied Physics, 133(23), 235701.
https://doi.org/10.1063/5.0152713

Stanimirović I, Markushev D, Stanimirović Z, Galović S, Đorđević KL. Analysis of plasma-elastic component of time-domain photoacoustic response. in Journal of Applied Physics. 2023;133(23):235701.
doi:10.1063/5.0152713 .

Stanimirović, Ivanka, Markushev, Dragana, Stanimirović, Zdravko, Galović, Slobodanka, Đorđević, Katarina Lj., "Analysis of plasma-elastic component of time-domain photoacoustic response" in Journal of Applied Physics, 133, no. 23 (2023):235701,
https://doi.org/10.1063/5.0152713 . .

TY  - JOUR
AU  - Galović, Slobodanka
AU  - Đorđević, Katarina Lj.
AU  - Nešić, Mioljub V.
AU  - Popović, Marica N.
AU  - Markushev, Dragan D.
AU  - Markushev, Dragana K.
AU  - Todorović, Dragan M.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11210
AB  - The model of a photoacoustic gas-microphone signal in the time domain recorded in a transmission configuration using a minimum volume cell is derived. This model takes into account the inertial thermal relaxations of both the sample and the gas filling the cell by means of the generalized hyperbolic theory of heat conduction. With the introduction of electro-thermal analogy for the thin sample and short microphone length cavity, characteristic quantities are defined, which can be used in solving the inverse problem in time-domain photoacoustic in both cases, when thermal relaxations are neglected as well as when they are considered. The derived model that includes thermal relaxation explains the experimentally observed occurrence of overshoots and undershoots as well as an oscillatory approach to the steady values of the recorded signal in high-resolution time-domain photoacoustic measurements of thin semiconductor membranes, which will be presented in detail in Paper II of the paper. © 2023 Author(s).
T2  - Journal of Applied Physics
T1  - Time-domain minimum-volume cell photoacoustic of thin semiconductor layer. I. Theory
VL  - 133
IS  - 24
SP  - 245701
DO  - 10.1063/5.0152519
ER  - 

@article{
author = "Galović, Slobodanka and Đorđević, Katarina Lj. and Nešić, Mioljub V. and Popović, Marica N. and Markushev, Dragan D. and Markushev, Dragana K. and Todorović, Dragan M.",
year = "2023",
abstract = "The model of a photoacoustic gas-microphone signal in the time domain recorded in a transmission configuration using a minimum volume cell is derived. This model takes into account the inertial thermal relaxations of both the sample and the gas filling the cell by means of the generalized hyperbolic theory of heat conduction. With the introduction of electro-thermal analogy for the thin sample and short microphone length cavity, characteristic quantities are defined, which can be used in solving the inverse problem in time-domain photoacoustic in both cases, when thermal relaxations are neglected as well as when they are considered. The derived model that includes thermal relaxation explains the experimentally observed occurrence of overshoots and undershoots as well as an oscillatory approach to the steady values of the recorded signal in high-resolution time-domain photoacoustic measurements of thin semiconductor membranes, which will be presented in detail in Paper II of the paper. © 2023 Author(s).",
journal = "Journal of Applied Physics",
title = "Time-domain minimum-volume cell photoacoustic of thin semiconductor layer. I. Theory",
volume = "133",
number = "24",
pages = "245701",
doi = "10.1063/5.0152519"
}

Galović, S., Đorđević, K. Lj., Nešić, M. V., Popović, M. N., Markushev, D. D., Markushev, D. K.,& Todorović, D. M.. (2023). Time-domain minimum-volume cell photoacoustic of thin semiconductor layer. I. Theory. in Journal of Applied Physics, 133(24), 245701.
https://doi.org/10.1063/5.0152519

Galović S, Đorđević KL, Nešić MV, Popović MN, Markushev DD, Markushev DK, Todorović DM. Time-domain minimum-volume cell photoacoustic of thin semiconductor layer. I. Theory. in Journal of Applied Physics. 2023;133(24):245701.
doi:10.1063/5.0152519 .

Galović, Slobodanka, Đorđević, Katarina Lj., Nešić, Mioljub V., Popović, Marica N., Markushev, Dragan D., Markushev, Dragana K., Todorović, Dragan M., "Time-domain minimum-volume cell photoacoustic of thin semiconductor layer. I. Theory" in Journal of Applied Physics, 133, no. 24 (2023):245701,
https://doi.org/10.1063/5.0152519 . .

TY  - JOUR
AU  - Stanojević, Neda
AU  - Markushev, Dragana K.
AU  - Aleksić, Sanja M.
AU  - Pantić, Dragan S.
AU  - Galović, Slobodanka
AU  - Markushev, Dragan D.
AU  - Ordonez-Miranda, Jose
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11211
AB  - Based on the analogy between resistor-capacitor (RC) filters and the thermoelastic component of a photoacoustic signal, the complex thermoelastic response of an open photoacoustic cell is described as a simple linear time-invariant system of a low-pass RC filter. This description is done by finding a linear relation between the thermoelastic cut-off frequency and sample material thickness within the range of 10-1000 μm. Based on the theory of a composite piston, we run numerical simulations of the proposed method for n-type silicon, described as either a surface or volume absorber. Theoretical predictions are experimentally validated by using an open photoacoustic cell setup to record the signal of an 850-μm-thick n-type silicon wafer illuminated by a blue light source modulated with frequencies from 20 Hz to 20 kHz. The obtained experimental results confirm the linear dependence of the thermoelastic cut-off frequency on the sample thickness, and, therefore, they lay the foundation of a new method for the thermal characterization of materials. © 2023 Author(s).
T2  - Journal of Applied Physics
T1  - Thermal characterization of n-type silicon based on an electro-acoustic analogy
VL  - 133
IS  - 24
SP  - 245102
DO  - 10.1063/5.0152495
ER  - 

@article{
author = "Stanojević, Neda and Markushev, Dragana K. and Aleksić, Sanja M. and Pantić, Dragan S. and Galović, Slobodanka and Markushev, Dragan D. and Ordonez-Miranda, Jose",
year = "2023",
abstract = "Based on the analogy between resistor-capacitor (RC) filters and the thermoelastic component of a photoacoustic signal, the complex thermoelastic response of an open photoacoustic cell is described as a simple linear time-invariant system of a low-pass RC filter. This description is done by finding a linear relation between the thermoelastic cut-off frequency and sample material thickness within the range of 10-1000 μm. Based on the theory of a composite piston, we run numerical simulations of the proposed method for n-type silicon, described as either a surface or volume absorber. Theoretical predictions are experimentally validated by using an open photoacoustic cell setup to record the signal of an 850-μm-thick n-type silicon wafer illuminated by a blue light source modulated with frequencies from 20 Hz to 20 kHz. The obtained experimental results confirm the linear dependence of the thermoelastic cut-off frequency on the sample thickness, and, therefore, they lay the foundation of a new method for the thermal characterization of materials. © 2023 Author(s).",
journal = "Journal of Applied Physics",
title = "Thermal characterization of n-type silicon based on an electro-acoustic analogy",
volume = "133",
number = "24",
pages = "245102",
doi = "10.1063/5.0152495"
}

Stanojević, N., Markushev, D. K., Aleksić, S. M., Pantić, D. S., Galović, S., Markushev, D. D.,& Ordonez-Miranda, J.. (2023). Thermal characterization of n-type silicon based on an electro-acoustic analogy. in Journal of Applied Physics, 133(24), 245102.
https://doi.org/10.1063/5.0152495

Stanojević N, Markushev DK, Aleksić SM, Pantić DS, Galović S, Markushev DD, Ordonez-Miranda J. Thermal characterization of n-type silicon based on an electro-acoustic analogy. in Journal of Applied Physics. 2023;133(24):245102.
doi:10.1063/5.0152495 .

Stanojević, Neda, Markushev, Dragana K., Aleksić, Sanja M., Pantić, Dragan S., Galović, Slobodanka, Markushev, Dragan D., Ordonez-Miranda, Jose, "Thermal characterization of n-type silicon based on an electro-acoustic analogy" in Journal of Applied Physics, 133, no. 24 (2023):245102,
https://doi.org/10.1063/5.0152495 . .

TY  - JOUR
AU  - Stanojević, Neda
AU  - Markushev, Dragana K.
AU  - Aleksić, Sanja M.
AU  - Pantić, Dragan S.
AU  - Galović, Slobodanka
AU  - Markushev, Dragan D.
AU  - Ordonez-Miranda, Jose
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11212
AB  - Based on the analogy between resistor-capacitor (RC) filters and the thermoelastic component of a photoacoustic signal, the complex thermoelastic response of an open photoacoustic cell is described as a simple linear time-invariant system of a low-pass RC filter. This description is done by finding a linear relation between the thermoelastic cut-off frequency and sample material thickness within the range of 10-1000 μm. Based on the theory of a composite piston, we run numerical simulations of the proposed method for n-type silicon, described as either a surface or volume absorber. Theoretical predictions are experimentally validated by using an open photoacoustic cell setup to record the signal of an 850-μm-thick n-type silicon wafer illuminated by a blue light source modulated with frequencies from 20 Hz to 20 kHz. The obtained experimental results confirm the linear dependence of the thermoelastic cut-off frequency on the sample thickness, and, therefore, they lay the foundation of a new method for the thermal characterization of materials. © 2023 Author(s).
T2  - Journal of Applied Physics
T1  - Thermal characterization of n-type silicon based on an electro-acoustic analogy
VL  - 133
IS  - 24
SP  - 245102
DO  - 10.1063/5.0152495
ER  - 

@article{
author = "Stanojević, Neda and Markushev, Dragana K. and Aleksić, Sanja M. and Pantić, Dragan S. and Galović, Slobodanka and Markushev, Dragan D. and Ordonez-Miranda, Jose",
year = "2023",
abstract = "Based on the analogy between resistor-capacitor (RC) filters and the thermoelastic component of a photoacoustic signal, the complex thermoelastic response of an open photoacoustic cell is described as a simple linear time-invariant system of a low-pass RC filter. This description is done by finding a linear relation between the thermoelastic cut-off frequency and sample material thickness within the range of 10-1000 μm. Based on the theory of a composite piston, we run numerical simulations of the proposed method for n-type silicon, described as either a surface or volume absorber. Theoretical predictions are experimentally validated by using an open photoacoustic cell setup to record the signal of an 850-μm-thick n-type silicon wafer illuminated by a blue light source modulated with frequencies from 20 Hz to 20 kHz. The obtained experimental results confirm the linear dependence of the thermoelastic cut-off frequency on the sample thickness, and, therefore, they lay the foundation of a new method for the thermal characterization of materials. © 2023 Author(s).",
journal = "Journal of Applied Physics",
title = "Thermal characterization of n-type silicon based on an electro-acoustic analogy",
volume = "133",
number = "24",
pages = "245102",
doi = "10.1063/5.0152495"
}

Stanojević, N., Markushev, D. K., Aleksić, S. M., Pantić, D. S., Galović, S., Markushev, D. D.,& Ordonez-Miranda, J.. (2023). Thermal characterization of n-type silicon based on an electro-acoustic analogy. in Journal of Applied Physics, 133(24), 245102.
https://doi.org/10.1063/5.0152495

Stanojević N, Markushev DK, Aleksić SM, Pantić DS, Galović S, Markushev DD, Ordonez-Miranda J. Thermal characterization of n-type silicon based on an electro-acoustic analogy. in Journal of Applied Physics. 2023;133(24):245102.
doi:10.1063/5.0152495 .

Stanojević, Neda, Markushev, Dragana K., Aleksić, Sanja M., Pantić, Dragan S., Galović, Slobodanka, Markushev, Dragan D., Ordonez-Miranda, Jose, "Thermal characterization of n-type silicon based on an electro-acoustic analogy" in Journal of Applied Physics, 133, no. 24 (2023):245102,
https://doi.org/10.1063/5.0152495 . .

TY  - CONF
AU  - Đorđević, Katarina Lj.
AU  - Galović, Slobodanka
AU  - Dragaš, Milica A.
AU  - Markushev, Dragana K.
AU  - Markushev, Dragan D.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11800
AB  - Nano mechanical structures (NEMS) are being developed for application in pressure and temperature sensors. They consist of a very thin oxide layer on a silicon wafer. This layer is placed to improve their sensitivity to pressure changes. In this paper, it was investigated how much this layer affects the physical properties of such structures. In the research, the photoacoustic gas microphone experimental measurement method was applied and neural networks were developed for solving the inverse photoacoustic problem. The obtained results show that controlling the thickness of the oxide layer can be done by engineering the thermal elastic and optical properties of the NEMS.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - Influence of thin oxide layer to photoacoustic signal of nano-mechanical structures
SP  - 38
EP  - 38
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11800
ER  - 

@conference{
author = "Đorđević, Katarina Lj. and Galović, Slobodanka and Dragaš, Milica A. and Markushev, Dragana K. and Markushev, Dragan D.",
year = "2023",
abstract = "Nano mechanical structures (NEMS) are being developed for application in pressure and temperature sensors. They consist of a very thin oxide layer on a silicon wafer. This layer is placed to improve their sensitivity to pressure changes. In this paper, it was investigated how much this layer affects the physical properties of such structures. In the research, the photoacoustic gas microphone experimental measurement method was applied and neural networks were developed for solving the inverse photoacoustic problem. The obtained results show that controlling the thickness of the oxide layer can be done by engineering the thermal elastic and optical properties of the NEMS.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "Influence of thin oxide layer to photoacoustic signal of nano-mechanical structures",
pages = "38-38",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11800"
}

Đorđević, K. Lj., Galović, S., Dragaš, M. A., Markushev, D. K.,& Markushev, D. D.. (2023). Influence of thin oxide layer to photoacoustic signal of nano-mechanical structures. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 38-38.
https://hdl.handle.net/21.15107/rcub_vinar_11800

Đorđević KL, Galović S, Dragaš MA, Markushev DK, Markushev DD. Influence of thin oxide layer to photoacoustic signal of nano-mechanical structures. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:38-38.
https://hdl.handle.net/21.15107/rcub_vinar_11800 .

Đorđević, Katarina Lj., Galović, Slobodanka, Dragaš, Milica A., Markushev, Dragana K., Markushev, Dragan D., "Influence of thin oxide layer to photoacoustic signal of nano-mechanical structures" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):38-38,
https://hdl.handle.net/21.15107/rcub_vinar_11800 .

TY  - CONF
AU  - Đorđević, Katarina Lj.
AU  - Galović, Slobodanka
AU  - Jordović-Pavlović, Miroslava I.
AU  - Markushev, Dragan D.
AU  - Markushev, Dragana K.
AU  - Nešić, Mioljub V.
AU  - Popović, Marica N.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11938
AB  - The idea of this paper is to develop a method for determination thermal diffusivity, linear expansion coefficient and thickness of a semiconductor sample from photoacoustic phase measurement by using neural network. The neural network has been trained on photoacoustic phases obtained from a theoretical model of measured signal for Si n-type in the range of 20Hz to 20kHz. For the analysis of parameter determination from phases, we trained phase neural networks on a large database obtained from numerical experiments in the expected range of parameter changes. An analysis of a theoretical photoacoustic model with a phase neural network is demonstrated. The advantages of using a phase neural network with high accuracy and precision in prediction depending on the number of epochs are presented, as well as analyzes of the application of random Gaussian noise to the network in order to better predict the experimental photoacoustic signal.
C3  - Proceedings of Science
T1  - Еvaluation of Thermophysical Properties of Semiconductors by Photoacoustic Phase Neural Network
VL  - 427
SP  - 193246
DO  - 10.22323/1.427.0157
ER  - 

@conference{
author = "Đorđević, Katarina Lj. and Galović, Slobodanka and Jordović-Pavlović, Miroslava I. and Markushev, Dragan D. and Markushev, Dragana K. and Nešić, Mioljub V. and Popović, Marica N.",
year = "2023",
abstract = "The idea of this paper is to develop a method for determination thermal diffusivity, linear expansion coefficient and thickness of a semiconductor sample from photoacoustic phase measurement by using neural network. The neural network has been trained on photoacoustic phases obtained from a theoretical model of measured signal for Si n-type in the range of 20Hz to 20kHz. For the analysis of parameter determination from phases, we trained phase neural networks on a large database obtained from numerical experiments in the expected range of parameter changes. An analysis of a theoretical photoacoustic model with a phase neural network is demonstrated. The advantages of using a phase neural network with high accuracy and precision in prediction depending on the number of epochs are presented, as well as analyzes of the application of random Gaussian noise to the network in order to better predict the experimental photoacoustic signal.",
journal = "Proceedings of Science",
title = "Еvaluation of Thermophysical Properties of Semiconductors by Photoacoustic Phase Neural Network",
volume = "427",
pages = "193246",
doi = "10.22323/1.427.0157"
}

Đorđević, K. Lj., Galović, S., Jordović-Pavlović, M. I., Markushev, D. D., Markushev, D. K., Nešić, M. V.,& Popović, M. N.. (2023). Еvaluation of Thermophysical Properties of Semiconductors by Photoacoustic Phase Neural Network. in Proceedings of Science, 427, 193246.
https://doi.org/10.22323/1.427.0157

Đorđević KL, Galović S, Jordović-Pavlović MI, Markushev DD, Markushev DK, Nešić MV, Popović MN. Еvaluation of Thermophysical Properties of Semiconductors by Photoacoustic Phase Neural Network. in Proceedings of Science. 2023;427:193246.
doi:10.22323/1.427.0157 .

Đorđević, Katarina Lj., Galović, Slobodanka, Jordović-Pavlović, Miroslava I., Markushev, Dragan D., Markushev, Dragana K., Nešić, Mioljub V., Popović, Marica N., "Еvaluation of Thermophysical Properties of Semiconductors by Photoacoustic Phase Neural Network" in Proceedings of Science, 427 (2023):193246,
https://doi.org/10.22323/1.427.0157 . .

TY  - CONF
AU  - Miletić, Vesna
AU  - Markushev, Dragana K.
AU  - Markushev, Dragan D.
AU  - Popović, Marica
AU  - Đorđević, Katarina Lj.
AU  - Galović, Slobodanka
AU  - Nešić, Mioljub
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10961
AB  - U ovom radu ispitivan je uticaj nanetog sloja boje na površinske temperaturske varijacije uzorka poliamida. Uzorak, dobijen laserskim sinterovanjem industrijskog praha PA2200, se obasjava mnodulisanim laserskim snopom, dok se naneti sloj boje ne pobuđuje direktno. Razmatra se dinamička komponenta temperaturske promene na površini uzorka u transmisionoj i refleksionoj konfiguraciji, kao ključna komponenta formiranja fotoaksutičkog odziva.
AB  - In this paper, the influence of the applied dye layer on surface temperature variations of polyamide sampleis investigated. The sample, obtained by laser sintering of PA2200 industrial powder, is irradiated by a modulated laser beam, while the applied layer is not excited directly. Dynamic component of temperature change at sample surface is considered, in both transmission and reflexion configuration, as the key componetn in the formation of photoacoustic resopnse.
PB  - Istočno Sarajevo : Elektrotehnički fakultet
C3  - InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina
T1  - Ispitivanje uticaja nanetog sloja boje na površinske temperaturske varijacije laserski sinterovanog poliamida
T1  - Investigation of the influence of the applied dye layer on surface temperature variations of laser sintered polyamide
SP  - 156
EP  - 159
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10961
ER  - 

@conference{
author = "Miletić, Vesna and Markushev, Dragana K. and Markushev, Dragan D. and Popović, Marica and Đorđević, Katarina Lj. and Galović, Slobodanka and Nešić, Mioljub",
year = "2022",
abstract = "U ovom radu ispitivan je uticaj nanetog sloja boje na površinske temperaturske varijacije uzorka poliamida. Uzorak, dobijen laserskim sinterovanjem industrijskog praha PA2200, se obasjava mnodulisanim laserskim snopom, dok se naneti sloj boje ne pobuđuje direktno. Razmatra se dinamička komponenta temperaturske promene na površini uzorka u transmisionoj i refleksionoj konfiguraciji, kao ključna komponenta formiranja fotoaksutičkog odziva., In this paper, the influence of the applied dye layer on surface temperature variations of polyamide sampleis investigated. The sample, obtained by laser sintering of PA2200 industrial powder, is irradiated by a modulated laser beam, while the applied layer is not excited directly. Dynamic component of temperature change at sample surface is considered, in both transmission and reflexion configuration, as the key componetn in the formation of photoacoustic resopnse.",
publisher = "Istočno Sarajevo : Elektrotehnički fakultet",
journal = "InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina",
title = "Ispitivanje uticaja nanetog sloja boje na površinske temperaturske varijacije laserski sinterovanog poliamida, Investigation of the influence of the applied dye layer on surface temperature variations of laser sintered polyamide",
pages = "156-159",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10961"
}

Miletić, V., Markushev, D. K., Markushev, D. D., Popović, M., Đorđević, K. Lj., Galović, S.,& Nešić, M.. (2022). Ispitivanje uticaja nanetog sloja boje na površinske temperaturske varijacije laserski sinterovanog poliamida. in InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina
Istočno Sarajevo : Elektrotehnički fakultet., 156-159.
https://hdl.handle.net/21.15107/rcub_vinar_10961

Miletić V, Markushev DK, Markushev DD, Popović M, Đorđević KL, Galović S, Nešić M. Ispitivanje uticaja nanetog sloja boje na površinske temperaturske varijacije laserski sinterovanog poliamida. in InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina. 2022;:156-159.
https://hdl.handle.net/21.15107/rcub_vinar_10961 .

Miletić, Vesna, Markushev, Dragana K., Markushev, Dragan D., Popović, Marica, Đorđević, Katarina Lj., Galović, Slobodanka, Nešić, Mioljub, "Ispitivanje uticaja nanetog sloja boje na površinske temperaturske varijacije laserski sinterovanog poliamida" in InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina (2022):156-159,
https://hdl.handle.net/21.15107/rcub_vinar_10961 .

TY  - CONF
AU  - Đorđević, Katarina Lj.
AU  - Galović, Slobodanka
AU  - Nešić, Mioljub
AU  - Todorović, D.
AU  - Popović, Marica
AU  - Markushev, Dragan D.
AU  - Markushev, Dragana K.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10962
AB  - Laboratory-built measuring device, based on pulse photoacoustic (PA) effect, which allows the measurement of optical and acoustic signals in time domain, is presented. The experimental setup is described and the device specifications are given in detail. Optical and PA signals are measured in a time range from 10 μs to 10 s, for different samples and conditions. As an example, the experimental results for Si square membrane (Si chip with 5 x 5 mm frame and 3 × 3 mm square membrane, 32 μm thick, used in micromechanic devices) are presented. The square membrane Si chips were prepared by wet anisotropic bulk micromachining process. The applicability of the measured PA signal in the characterization of semiconductors and micromechanical structures is discussed.
PB  - Istočno Sarajevo : Elektrotehnički fakultet
C3  - InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina
T1  - Transmission pulse photoacoustic set-up for characterization of solids
SP  - 161
EP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10962
ER  - 

@conference{
author = "Đorđević, Katarina Lj. and Galović, Slobodanka and Nešić, Mioljub and Todorović, D. and Popović, Marica and Markushev, Dragan D. and Markushev, Dragana K.",
year = "2022",
abstract = "Laboratory-built measuring device, based on pulse photoacoustic (PA) effect, which allows the measurement of optical and acoustic signals in time domain, is presented. The experimental setup is described and the device specifications are given in detail. Optical and PA signals are measured in a time range from 10 μs to 10 s, for different samples and conditions. As an example, the experimental results for Si square membrane (Si chip with 5 x 5 mm frame and 3 × 3 mm square membrane, 32 μm thick, used in micromechanic devices) are presented. The square membrane Si chips were prepared by wet anisotropic bulk micromachining process. The applicability of the measured PA signal in the characterization of semiconductors and micromechanical structures is discussed.",
publisher = "Istočno Sarajevo : Elektrotehnički fakultet",
journal = "InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina",
title = "Transmission pulse photoacoustic set-up for characterization of solids",
pages = "161-164",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10962"
}

Đorđević, K. Lj., Galović, S., Nešić, M., Todorović, D., Popović, M., Markushev, D. D.,& Markushev, D. K.. (2022). Transmission pulse photoacoustic set-up for characterization of solids. in InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina
Istočno Sarajevo : Elektrotehnički fakultet., 161-164.
https://hdl.handle.net/21.15107/rcub_vinar_10962

Đorđević KL, Galović S, Nešić M, Todorović D, Popović M, Markushev DD, Markushev DK. Transmission pulse photoacoustic set-up for characterization of solids. in InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina. 2022;:161-164.
https://hdl.handle.net/21.15107/rcub_vinar_10962 .

Đorđević, Katarina Lj., Galović, Slobodanka, Nešić, Mioljub, Todorović, D., Popović, Marica, Markushev, Dragan D., Markushev, Dragana K., "Transmission pulse photoacoustic set-up for characterization of solids" in InfoTeh-Jahorina : 21. međunarodni simpozijum INFOTEH-JAHORINA 2022 : zbornik radova; Mart 16-18; Jahorina (2022):161-164,
https://hdl.handle.net/21.15107/rcub_vinar_10962 .

TY  - JOUR
AU  - Đorđević, Katarina Lj.
AU  - Galović, Slobodanka
AU  - Ćojbašić, Žarko М.
AU  - Markushev, Dragan D.
AU  - Markushev, Dragana K.
AU  - Aleksić, Sanja M.
AU  - Pantić, Damjan S.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10349
AB  - In this paper, electronic semiconductor characterization using reverse-back procedure was applied to different photoacoustic responses aiming to find effective ambipolar diffusion coefficient and a bulk lifetime of the minority carriers. The main idea was to find the small fluctuations in investigated parameters due to detecting possible unwanted sample contaminations and temperature variations during the measurements. The mentioned procedure was based on the application of neural networks. Knowing that in experiments the contaminated surfaces of the sample can play a significant role in the global recombination process that we are measuring and that the unintentionally introduced defects of the sample crystal lattice could vary the carrier lifetime by several orders of magnitude, a method of PA signal adjustment by the reverse-back procedure is developed, based on the changes of the carrier electronic parameters.
T2  - Optical and Quantum Electronics
T1  - Electronic characterization of plasma-thick n-type silicon using neural networks and photoacoustic response
VL  - 54
IS  - 8
SP  - 485
DO  - 10.1007/s11082-022-03808-3
ER  - 

@article{
author = "Đorđević, Katarina Lj. and Galović, Slobodanka and Ćojbašić, Žarko М. and Markushev, Dragan D. and Markushev, Dragana K. and Aleksić, Sanja M. and Pantić, Damjan S.",
year = "2022",
abstract = "In this paper, electronic semiconductor characterization using reverse-back procedure was applied to different photoacoustic responses aiming to find effective ambipolar diffusion coefficient and a bulk lifetime of the minority carriers. The main idea was to find the small fluctuations in investigated parameters due to detecting possible unwanted sample contaminations and temperature variations during the measurements. The mentioned procedure was based on the application of neural networks. Knowing that in experiments the contaminated surfaces of the sample can play a significant role in the global recombination process that we are measuring and that the unintentionally introduced defects of the sample crystal lattice could vary the carrier lifetime by several orders of magnitude, a method of PA signal adjustment by the reverse-back procedure is developed, based on the changes of the carrier electronic parameters.",
journal = "Optical and Quantum Electronics",
title = "Electronic characterization of plasma-thick n-type silicon using neural networks and photoacoustic response",
volume = "54",
number = "8",
pages = "485",
doi = "10.1007/s11082-022-03808-3"
}

Đorđević, K. Lj., Galović, S., Ćojbašić, Ž. М., Markushev, D. D., Markushev, D. K., Aleksić, S. M.,& Pantić, D. S.. (2022). Electronic characterization of plasma-thick n-type silicon using neural networks and photoacoustic response. in Optical and Quantum Electronics, 54(8), 485.
https://doi.org/10.1007/s11082-022-03808-3

Đorđević KL, Galović S, Ćojbašić ŽМ, Markushev DD, Markushev DK, Aleksić SM, Pantić DS. Electronic characterization of plasma-thick n-type silicon using neural networks and photoacoustic response. in Optical and Quantum Electronics. 2022;54(8):485.
doi:10.1007/s11082-022-03808-3 .

Đorđević, Katarina Lj., Galović, Slobodanka, Ćojbašić, Žarko М., Markushev, Dragan D., Markushev, Dragana K., Aleksić, Sanja M., Pantić, Damjan S., "Electronic characterization of plasma-thick n-type silicon using neural networks and photoacoustic response" in Optical and Quantum Electronics, 54, no. 8 (2022):485,
https://doi.org/10.1007/s11082-022-03808-3 . .

TY  - JOUR
AU  - Aleksić, Sanja M.
AU  - Markushev, Dragana K.
AU  - Markushev, Dragan D.
AU  - Pantić, Dragan S.
AU  - Lukić, D. V.
AU  - Popović, Marica N.
AU  - Galović, Slobodanka
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10166
AB  - This paper describes the influence of thin transparent film on thermal and elastic characteristics of the two-layer sample consisting of the silicon substrate and thin TiO2 film using analysis of photoacoustic signals and their components in the 20 Hz – 20 kHz frequency domain. Through thermoelastic component changes, it was found that the thin film significantly changes the thermal state of the substrate and makes the degree of its bending increase drastically. The relationships between the thermoelastic component, the displacement along the heat flux axis and the difference of carrier density and temperatures on the different sides of the sample are described. It has been shown that the addition of a thin transparent film to a silicon substrate can effectively reduce the influence of photogenerated carriers in the substrate, especially on its degree of flexibility and restore it efficiently.
T2  - Silicon
T1  - Photoacoustic Analysis of Illuminated Si-TiO2 Sample Bending Along the Heat-Flow Axes
DO  - 10.1007/s12633-022-01723-6
ER  - 

@article{
author = "Aleksić, Sanja M. and Markushev, Dragana K. and Markushev, Dragan D. and Pantić, Dragan S. and Lukić, D. V. and Popović, Marica N. and Galović, Slobodanka",
year = "2022",
abstract = "This paper describes the influence of thin transparent film on thermal and elastic characteristics of the two-layer sample consisting of the silicon substrate and thin TiO2 film using analysis of photoacoustic signals and their components in the 20 Hz – 20 kHz frequency domain. Through thermoelastic component changes, it was found that the thin film significantly changes the thermal state of the substrate and makes the degree of its bending increase drastically. The relationships between the thermoelastic component, the displacement along the heat flux axis and the difference of carrier density and temperatures on the different sides of the sample are described. It has been shown that the addition of a thin transparent film to a silicon substrate can effectively reduce the influence of photogenerated carriers in the substrate, especially on its degree of flexibility and restore it efficiently.",
journal = "Silicon",
title = "Photoacoustic Analysis of Illuminated Si-TiO2 Sample Bending Along the Heat-Flow Axes",
doi = "10.1007/s12633-022-01723-6"
}

Aleksić, S. M., Markushev, D. K., Markushev, D. D., Pantić, D. S., Lukić, D. V., Popović, M. N.,& Galović, S.. (2022). Photoacoustic Analysis of Illuminated Si-TiO2 Sample Bending Along the Heat-Flow Axes. in Silicon.
https://doi.org/10.1007/s12633-022-01723-6

Aleksić SM, Markushev DK, Markushev DD, Pantić DS, Lukić DV, Popović MN, Galović S. Photoacoustic Analysis of Illuminated Si-TiO2 Sample Bending Along the Heat-Flow Axes. in Silicon. 2022;.
doi:10.1007/s12633-022-01723-6 .

Aleksić, Sanja M., Markushev, Dragana K., Markushev, Dragan D., Pantić, Dragan S., Lukić, D. V., Popović, Marica N., Galović, Slobodanka, "Photoacoustic Analysis of Illuminated Si-TiO2 Sample Bending Along the Heat-Flow Axes" in Silicon (2022),
https://doi.org/10.1007/s12633-022-01723-6 . .

TY  - JOUR
AU  - Markushev, Dragana K.
AU  - Markushev, Dragan D.
AU  - Aleksić, Sanja M.
AU  - Pantić, Dragan S.
AU  - Galović, Slobodanka
AU  - Lukić, D V
AU  - Ordonez-Miranda, Jose
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10198
AB  - The reduction of the photogenerated charge carriers' influence in periodically illuminated thin silicon membranes is investigated by using the experimental setup of an open photoacoustic cell in the standard range of modulation frequencies from 20 Hz to 20 kHz. It is confirmed that the deposition of a 200 nm thin film of titanium dioxide on the 30- and 50 μm silicon membrane leads to a large increase of the thermoelastic component of the photoacoustic signal, which restores the flexibility lost to the membrane under the influence of photogenerated carriers. The effect of the thermoelastic component enhancement is analyzed by observing the displacement of the tested samples along the heat propagation axis, depending on the carrier density and temperature differences on the illuminated and unilluminated sides, for different membrane thicknesses and a constant film thickness. It is found that the effect of enhancement of several orders of magnitude is more visible in thinner membranes due to higher ratios between the film and membrane thicknesses.
T2  - Journal of Applied Physics
T1  - Enhancement of the thermoelastic component of the photoacoustic signal of silicon membranes coated with a thin TiO2 film
VL  - 131
IS  - 8
SP  - 085105
DO  - 10.1063/5.0079902
ER  - 

@article{
author = "Markushev, Dragana K. and Markushev, Dragan D. and Aleksić, Sanja M. and Pantić, Dragan S. and Galović, Slobodanka and Lukić, D V and Ordonez-Miranda, Jose",
year = "2022",
abstract = "The reduction of the photogenerated charge carriers' influence in periodically illuminated thin silicon membranes is investigated by using the experimental setup of an open photoacoustic cell in the standard range of modulation frequencies from 20 Hz to 20 kHz. It is confirmed that the deposition of a 200 nm thin film of titanium dioxide on the 30- and 50 μm silicon membrane leads to a large increase of the thermoelastic component of the photoacoustic signal, which restores the flexibility lost to the membrane under the influence of photogenerated carriers. The effect of the thermoelastic component enhancement is analyzed by observing the displacement of the tested samples along the heat propagation axis, depending on the carrier density and temperature differences on the illuminated and unilluminated sides, for different membrane thicknesses and a constant film thickness. It is found that the effect of enhancement of several orders of magnitude is more visible in thinner membranes due to higher ratios between the film and membrane thicknesses.",
journal = "Journal of Applied Physics",
title = "Enhancement of the thermoelastic component of the photoacoustic signal of silicon membranes coated with a thin TiO2 film",
volume = "131",
number = "8",
pages = "085105",
doi = "10.1063/5.0079902"
}

Markushev, D. K., Markushev, D. D., Aleksić, S. M., Pantić, D. S., Galović, S., Lukić, D. V.,& Ordonez-Miranda, J.. (2022). Enhancement of the thermoelastic component of the photoacoustic signal of silicon membranes coated with a thin TiO2 film. in Journal of Applied Physics, 131(8), 085105.
https://doi.org/10.1063/5.0079902

Markushev DK, Markushev DD, Aleksić SM, Pantić DS, Galović S, Lukić DV, Ordonez-Miranda J. Enhancement of the thermoelastic component of the photoacoustic signal of silicon membranes coated with a thin TiO2 film. in Journal of Applied Physics. 2022;131(8):085105.
doi:10.1063/5.0079902 .

Markushev, Dragana K., Markushev, Dragan D., Aleksić, Sanja M., Pantić, Dragan S., Galović, Slobodanka, Lukić, D V, Ordonez-Miranda, Jose, "Enhancement of the thermoelastic component of the photoacoustic signal of silicon membranes coated with a thin TiO2 film" in Journal of Applied Physics, 131, no. 8 (2022):085105,
https://doi.org/10.1063/5.0079902 . .

TY  - JOUR
AU  - Markushev, Dragana K.
AU  - Markushev, Dragan D.
AU  - Aleksić, Sanja M.
AU  - Pantić, Dragan S.
AU  - Galović, Slobodanka
AU  - Todorović, Dragan M.
AU  - Ordonez-Miranda, Jose
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9663
AB  - Based on the experimental and theoretical signals of an open photoacoustic cell operating with modulation frequencies from 20 Hz to
20 kHz, a significant contribution of photogenerated excess carriers on the thermal and thermoelastic responses of an n-type silicon plate is
observed for the very first time. This is achieved by comparing the measured amplitude and phase of the photoacoustic signal with their
corresponding theoretical thermoelastic counterparts, for high enough modulation frequencies mainly. It is shown that the amplitude of the
thermoelastic component of plasma-thin samples varies about two orders of magnitude with respect to the corresponding one of
plasma-thick samples. Furthermore, we find a maximal temperature difference ΔT =− 35 nK between the illuminated and non-illuminated
sample surfaces, which shows that thin silicon plates with excess carriers could be used as heat sinks.
T2  - Journal of Applied Physics
T1  - Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon
VL  - 128
IS  - 9
SP  - 095103
DO  - 10.1063/5.0015657
ER  - 

@article{
author = "Markushev, Dragana K. and Markushev, Dragan D. and Aleksić, Sanja M. and Pantić, Dragan S. and Galović, Slobodanka and Todorović, Dragan M. and Ordonez-Miranda, Jose",
year = "2020",
abstract = "Based on the experimental and theoretical signals of an open photoacoustic cell operating with modulation frequencies from 20 Hz to
20 kHz, a significant contribution of photogenerated excess carriers on the thermal and thermoelastic responses of an n-type silicon plate is
observed for the very first time. This is achieved by comparing the measured amplitude and phase of the photoacoustic signal with their
corresponding theoretical thermoelastic counterparts, for high enough modulation frequencies mainly. It is shown that the amplitude of the
thermoelastic component of plasma-thin samples varies about two orders of magnitude with respect to the corresponding one of
plasma-thick samples. Furthermore, we find a maximal temperature difference ΔT =− 35 nK between the illuminated and non-illuminated
sample surfaces, which shows that thin silicon plates with excess carriers could be used as heat sinks.",
journal = "Journal of Applied Physics",
title = "Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon",
volume = "128",
number = "9",
pages = "095103",
doi = "10.1063/5.0015657"
}

Markushev, D. K., Markushev, D. D., Aleksić, S. M., Pantić, D. S., Galović, S., Todorović, D. M.,& Ordonez-Miranda, J.. (2020). Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon. in Journal of Applied Physics, 128(9), 095103.
https://doi.org/10.1063/5.0015657

Markushev DK, Markushev DD, Aleksić SM, Pantić DS, Galović S, Todorović DM, Ordonez-Miranda J. Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon. in Journal of Applied Physics. 2020;128(9):095103.
doi:10.1063/5.0015657 .

Markushev, Dragana K., Markushev, Dragan D., Aleksić, Sanja M., Pantić, Dragan S., Galović, Slobodanka, Todorović, Dragan M., Ordonez-Miranda, Jose, "Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon" in Journal of Applied Physics, 128, no. 9 (2020):095103,
https://doi.org/10.1063/5.0015657 . .