TY  - JOUR
AU  - Rađenović, Branislav M.
AU  - Radmilović-Rađenović, Marija
AU  - Beličev, Petar
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1544
AB  - In this paper the eigenmodes of finite length microring resonator arrays have been systematically studied, both analytically using temporal coupled mode theory (CMT), and numerically using two-dimensional finite element method (FEM). The method for obtaining the values of parameters appearing in simplified CMT model using results of FEM calculations is presented. Calculations were carried out by COMSOL FEM packages for a wide range of distances between the rings. The obtained results reveal that the rotational degeneracy is preserved for a wide range of interrings distances. It is shown how the eigenvalue spectrum depends on the number of cavities in the system. The differences for the cases of odd and even numbers of rings, and its implications on actual applications, are discussed in details. The central branch appearing in odd-number arrays plays significant role for the delay-lines and optical buffering applications. Based on the first order perturbation theory, an analytical expressions for the eigenfrequencies of arbitrary (finite) length linear array of microring resonators are derived. The analytical expressions describing eigenfrequencies are useful for determining positions of the maxima in transfer characteristics in microring arrays with external buses.
T2  - Optical and Quantum Electronics
T1  - Eigenmodes of finite length silicon-on-insulator microring resonator arrays
VL  - 49
IS  - 4
DO  - 10.1007/s11082-017-0984-9
ER  - 

@article{
author = "Rađenović, Branislav M. and Radmilović-Rađenović, Marija and Beličev, Petar",
year = "2017",
abstract = "In this paper the eigenmodes of finite length microring resonator arrays have been systematically studied, both analytically using temporal coupled mode theory (CMT), and numerically using two-dimensional finite element method (FEM). The method for obtaining the values of parameters appearing in simplified CMT model using results of FEM calculations is presented. Calculations were carried out by COMSOL FEM packages for a wide range of distances between the rings. The obtained results reveal that the rotational degeneracy is preserved for a wide range of interrings distances. It is shown how the eigenvalue spectrum depends on the number of cavities in the system. The differences for the cases of odd and even numbers of rings, and its implications on actual applications, are discussed in details. The central branch appearing in odd-number arrays plays significant role for the delay-lines and optical buffering applications. Based on the first order perturbation theory, an analytical expressions for the eigenfrequencies of arbitrary (finite) length linear array of microring resonators are derived. The analytical expressions describing eigenfrequencies are useful for determining positions of the maxima in transfer characteristics in microring arrays with external buses.",
journal = "Optical and Quantum Electronics",
title = "Eigenmodes of finite length silicon-on-insulator microring resonator arrays",
volume = "49",
number = "4",
doi = "10.1007/s11082-017-0984-9"
}

Rađenović, B. M., Radmilović-Rađenović, M.,& Beličev, P.. (2017). Eigenmodes of finite length silicon-on-insulator microring resonator arrays. in Optical and Quantum Electronics, 49(4).
https://doi.org/10.1007/s11082-017-0984-9

Rađenović BM, Radmilović-Rađenović M, Beličev P. Eigenmodes of finite length silicon-on-insulator microring resonator arrays. in Optical and Quantum Electronics. 2017;49(4).
doi:10.1007/s11082-017-0984-9 .

Rađenović, Branislav M., Radmilović-Rađenović, Marija, Beličev, Petar, "Eigenmodes of finite length silicon-on-insulator microring resonator arrays" in Optical and Quantum Electronics, 49, no. 4 (2017),
https://doi.org/10.1007/s11082-017-0984-9 . .

TY  - JOUR
AU  - Radmilović-Rađenović, Marija
AU  - Rađenović, Branislav M.
AU  - Beličev, Petar
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4977
AB  - In this paper we have presented our simulation studies of 2.4 GHz microwave plasma production under the electron cyclotron resonance with an idea to expand the plasma generation conditions into the much lower pressure range and much shorter gap length. As the first for this purpose, we have focused on the influences of applied magnetic field, gas pressure and gap length on the breakdown and maintenance of plasmas. Calculations were performed by using a one-dimensional particle-in-cell/Monte Carlo collisions code with three velocity components. The obtained simulation results are in a good agreement with the available experimental data providing an insight into the resonant electron acceleration for ECR condition and the resonant electron confinement for the 2nd harmonic ECR. In addition, analytical expressions for the breakdown voltage and the trapping field have been derived.
T2  - Acta Physica Polonica A
T1  - Characteristics of the 2nd Harmonic ECR Micro Plasma Sources by Using PIC/MCC Simulations
VL  - 122
IS  - 1
SP  - 128
EP  - 131
DO  - 10.12693/APhysPolA.122.128
ER  - 

@article{
author = "Radmilović-Rađenović, Marija and Rađenović, Branislav M. and Beličev, Petar",
year = "2012",
abstract = "In this paper we have presented our simulation studies of 2.4 GHz microwave plasma production under the electron cyclotron resonance with an idea to expand the plasma generation conditions into the much lower pressure range and much shorter gap length. As the first for this purpose, we have focused on the influences of applied magnetic field, gas pressure and gap length on the breakdown and maintenance of plasmas. Calculations were performed by using a one-dimensional particle-in-cell/Monte Carlo collisions code with three velocity components. The obtained simulation results are in a good agreement with the available experimental data providing an insight into the resonant electron acceleration for ECR condition and the resonant electron confinement for the 2nd harmonic ECR. In addition, analytical expressions for the breakdown voltage and the trapping field have been derived.",
journal = "Acta Physica Polonica A",
title = "Characteristics of the 2nd Harmonic ECR Micro Plasma Sources by Using PIC/MCC Simulations",
volume = "122",
number = "1",
pages = "128-131",
doi = "10.12693/APhysPolA.122.128"
}

Radmilović-Rađenović, M., Rađenović, B. M.,& Beličev, P.. (2012). Characteristics of the 2nd Harmonic ECR Micro Plasma Sources by Using PIC/MCC Simulations. in Acta Physica Polonica A, 122(1), 128-131.
https://doi.org/10.12693/APhysPolA.122.128

Radmilović-Rađenović M, Rađenović BM, Beličev P. Characteristics of the 2nd Harmonic ECR Micro Plasma Sources by Using PIC/MCC Simulations. in Acta Physica Polonica A. 2012;122(1):128-131.
doi:10.12693/APhysPolA.122.128 .

Radmilović-Rađenović, Marija, Rađenović, Branislav M., Beličev, Petar, "Characteristics of the 2nd Harmonic ECR Micro Plasma Sources by Using PIC/MCC Simulations" in Acta Physica Polonica A, 122, no. 1 (2012):128-131,
https://doi.org/10.12693/APhysPolA.122.128 . .

TY  - CONF
AU  - Radmilović-Rađenović, Marija
AU  - Petrovic, Z. Lj.
AU  - Nikitovic, Z.
AU  - Strinic, A.
AU  - Stojanovic, V.
AU  - Nina, A.
AU  - Rađenović, Branislav M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6583
AB  - Neutral beam processing has evolved into one of the most promising methods for overcoming plasma process induced damage. Surface treatment by neutrals avoids problems with surface charging effects, frequently encountered when using common ion treatment, especially for low k-materials. In this paper, the influence of various parameters on the neutralization of ion beams in Ar-CF4 mixture based on a Particle in Cell with Monte Carlo collisions (PIC/MCC) simulation is studied. The efficiency of neutralization has been treated by considering both surface neutralization of ions and collisions of ions in the gas.
C3  - Materials Science Forum
T1  - Particle-in-cell modelling of a neutral beam source for material processing in nanoscale structures fabrication
VL  - 555
SP  - 47
EP  - +
DO  - 10.4028/www.scientific.net/MSF.555.47
ER  - 

@conference{
author = "Radmilović-Rađenović, Marija and Petrovic, Z. Lj. and Nikitovic, Z. and Strinic, A. and Stojanovic, V. and Nina, A. and Rađenović, Branislav M.",
year = "2007",
abstract = "Neutral beam processing has evolved into one of the most promising methods for overcoming plasma process induced damage. Surface treatment by neutrals avoids problems with surface charging effects, frequently encountered when using common ion treatment, especially for low k-materials. In this paper, the influence of various parameters on the neutralization of ion beams in Ar-CF4 mixture based on a Particle in Cell with Monte Carlo collisions (PIC/MCC) simulation is studied. The efficiency of neutralization has been treated by considering both surface neutralization of ions and collisions of ions in the gas.",
journal = "Materials Science Forum",
title = "Particle-in-cell modelling of a neutral beam source for material processing in nanoscale structures fabrication",
volume = "555",
pages = "47-+",
doi = "10.4028/www.scientific.net/MSF.555.47"
}

Radmilović-Rađenović, M., Petrovic, Z. Lj., Nikitovic, Z., Strinic, A., Stojanovic, V., Nina, A.,& Rađenović, B. M.. (2007). Particle-in-cell modelling of a neutral beam source for material processing in nanoscale structures fabrication. in Materials Science Forum, 555, 47-+.
https://doi.org/10.4028/www.scientific.net/MSF.555.47

Radmilović-Rađenović M, Petrovic ZL, Nikitovic Z, Strinic A, Stojanovic V, Nina A, Rađenović BM. Particle-in-cell modelling of a neutral beam source for material processing in nanoscale structures fabrication. in Materials Science Forum. 2007;555:47-+.
doi:10.4028/www.scientific.net/MSF.555.47 .

Radmilović-Rađenović, Marija, Petrovic, Z. Lj., Nikitovic, Z., Strinic, A., Stojanovic, V., Nina, A., Rađenović, Branislav M., "Particle-in-cell modelling of a neutral beam source for material processing in nanoscale structures fabrication" in Materials Science Forum, 555 (2007):47-+,
https://doi.org/10.4028/www.scientific.net/MSF.555.47 . .

TY  - JOUR
AU  - Radmilović-Rađenović, Marija
AU  - Rađenović, Branislav M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3197
AB  - In this paper, the failure of the breakdown voltage from the Paschens law at extremely small electrode separations is studied. The electrical breakdown in microgaps occurs at the voltages far below the Paschen curve minimum breakdown limit and the modified Paschen curve should be used. Offered explanation for the departure from the Paschens law at small gap spacings is based on the increasing of the yield of the secondary electrons. The high electric fields existing in small gaps may enhance the secondary electron yield and this would lead to a lowering of the breakdown voltage and to the departure from the Paschens law. Particle-in-cell/Monte-Carlo (PIC/MCC) simulations with a new secondary emission model have been performed to estimate the importance of this mechanism in the discharge breakdown. Obtained simulation results suggest that deviations from the Paschen curve across the micron and submicorn gap spacing can be attributed to the ion-enhanced field emissions. (c) 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.
T2  - Contributions to Plasma Physics
T1  - A particle-in-cell simulation of the breakdown mechanism in microdischarges with an improved secondary emission model
VL  - 47
IS  - 3
SP  - 165
EP  - 172
DO  - 10.1002/ctpp.200710023
ER  - 

@article{
author = "Radmilović-Rađenović, Marija and Rađenović, Branislav M.",
year = "2007",
abstract = "In this paper, the failure of the breakdown voltage from the Paschens law at extremely small electrode separations is studied. The electrical breakdown in microgaps occurs at the voltages far below the Paschen curve minimum breakdown limit and the modified Paschen curve should be used. Offered explanation for the departure from the Paschens law at small gap spacings is based on the increasing of the yield of the secondary electrons. The high electric fields existing in small gaps may enhance the secondary electron yield and this would lead to a lowering of the breakdown voltage and to the departure from the Paschens law. Particle-in-cell/Monte-Carlo (PIC/MCC) simulations with a new secondary emission model have been performed to estimate the importance of this mechanism in the discharge breakdown. Obtained simulation results suggest that deviations from the Paschen curve across the micron and submicorn gap spacing can be attributed to the ion-enhanced field emissions. (c) 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.",
journal = "Contributions to Plasma Physics",
title = "A particle-in-cell simulation of the breakdown mechanism in microdischarges with an improved secondary emission model",
volume = "47",
number = "3",
pages = "165-172",
doi = "10.1002/ctpp.200710023"
}

Radmilović-Rađenović, M.,& Rađenović, B. M.. (2007). A particle-in-cell simulation of the breakdown mechanism in microdischarges with an improved secondary emission model. in Contributions to Plasma Physics, 47(3), 165-172.
https://doi.org/10.1002/ctpp.200710023

Radmilović-Rađenović M, Rađenović BM. A particle-in-cell simulation of the breakdown mechanism in microdischarges with an improved secondary emission model. in Contributions to Plasma Physics. 2007;47(3):165-172.
doi:10.1002/ctpp.200710023 .

Radmilović-Rađenović, Marija, Rađenović, Branislav M., "A particle-in-cell simulation of the breakdown mechanism in microdischarges with an improved secondary emission model" in Contributions to Plasma Physics, 47, no. 3 (2007):165-172,
https://doi.org/10.1002/ctpp.200710023 . .

TY  - JOUR
AU  - Radmilović-Rađenović, Marija
AU  - Radjnovic, B.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3177
AB  - A simple phenomenological model and detailed simulation studies of the breakdown phenomena in argon and nitrogen under the simultaneous action of electric and magnetic fields are presented in this paper. Expressions for the breakdown voltage have been derived taking into account variations of both the ionization coefficient and the secondary electron yield in a magnetic field. Calculations were performed by using XOOPIC code, an Object Oriented Particle in Cell code, with both the original and the improved secondary emission model with inclusion of the influence of the magnetic field on the secondary electron production. The simulation results presented here clearly show that the inclusion of the dependence of the secondary electron yield on the magnetic field leads to better agreement with existing experimental results.
T2  - Plasma Science and Technology
T1  - The influence of the magnetic field on the electrical breakdown phenomena
VL  - 9
IS  - 1
SP  - 45
EP  - 51
DO  - 10.1088/1009-0630/9/1/10
ER  - 

@article{
author = "Radmilović-Rađenović, Marija and Radjnovic, B.",
year = "2007",
abstract = "A simple phenomenological model and detailed simulation studies of the breakdown phenomena in argon and nitrogen under the simultaneous action of electric and magnetic fields are presented in this paper. Expressions for the breakdown voltage have been derived taking into account variations of both the ionization coefficient and the secondary electron yield in a magnetic field. Calculations were performed by using XOOPIC code, an Object Oriented Particle in Cell code, with both the original and the improved secondary emission model with inclusion of the influence of the magnetic field on the secondary electron production. The simulation results presented here clearly show that the inclusion of the dependence of the secondary electron yield on the magnetic field leads to better agreement with existing experimental results.",
journal = "Plasma Science and Technology",
title = "The influence of the magnetic field on the electrical breakdown phenomena",
volume = "9",
number = "1",
pages = "45-51",
doi = "10.1088/1009-0630/9/1/10"
}

Radmilović-Rađenović, M.,& Radjnovic, B.. (2007). The influence of the magnetic field on the electrical breakdown phenomena. in Plasma Science and Technology, 9(1), 45-51.
https://doi.org/10.1088/1009-0630/9/1/10

Radmilović-Rađenović M, Radjnovic B. The influence of the magnetic field on the electrical breakdown phenomena. in Plasma Science and Technology. 2007;9(1):45-51.
doi:10.1088/1009-0630/9/1/10 .

Radmilović-Rađenović, Marija, Radjnovic, B., "The influence of the magnetic field on the electrical breakdown phenomena" in Plasma Science and Technology, 9, no. 1 (2007):45-51,
https://doi.org/10.1088/1009-0630/9/1/10 . .

TY  - JOUR
AU  - Radmilović-Rađenović, Marija
AU  - Petrovic, Z. Li.
AU  - Malović, Gordana N.
AU  - Maric, D.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6625
AB  - This paper compares the basic phenomenological model based on the Townsends theory and the detailed simulation of the gas breakdown in argon in uniform DC electric field. Calculations were carried out by using a one-dimensional particle-in-cell/Monte Carlo (PIC/MCC) code with three velocity components with a new secondary emission model. The simulation results clearly show how different models of the secondary electron emission affect the breakdown voltage. The fact that results of simulation are in a good agreement with the available experimental data merely means that phenomenological secondary electron yields were developed to fit the experiment. However, oversimplified models cannot predict all features of Townsend discharges and cannot be reconciled with binary collision data. One such example is the need to predict the DC volt-ampere characteristics in order to reveal the predominant physical processes by studying the j/p(2) scaling.
T2  - Czechoslovak Journal of Physics
T1  - Modelling of low-pressure gas breakdown in uniform DC electric field by PIC technique with realistic secondary electron emission
VL  - 56
SP  - B996
EP  - B1001
DO  - 10.1007/s10582-006-0316-y
ER  - 

@article{
author = "Radmilović-Rađenović, Marija and Petrovic, Z. Li. and Malović, Gordana N. and Maric, D.",
year = "2006",
abstract = "This paper compares the basic phenomenological model based on the Townsends theory and the detailed simulation of the gas breakdown in argon in uniform DC electric field. Calculations were carried out by using a one-dimensional particle-in-cell/Monte Carlo (PIC/MCC) code with three velocity components with a new secondary emission model. The simulation results clearly show how different models of the secondary electron emission affect the breakdown voltage. The fact that results of simulation are in a good agreement with the available experimental data merely means that phenomenological secondary electron yields were developed to fit the experiment. However, oversimplified models cannot predict all features of Townsend discharges and cannot be reconciled with binary collision data. One such example is the need to predict the DC volt-ampere characteristics in order to reveal the predominant physical processes by studying the j/p(2) scaling.",
journal = "Czechoslovak Journal of Physics",
title = "Modelling of low-pressure gas breakdown in uniform DC electric field by PIC technique with realistic secondary electron emission",
volume = "56",
pages = "B996-B1001",
doi = "10.1007/s10582-006-0316-y"
}

Radmilović-Rađenović, M., Petrovic, Z. Li., Malović, G. N.,& Maric, D.. (2006). Modelling of low-pressure gas breakdown in uniform DC electric field by PIC technique with realistic secondary electron emission. in Czechoslovak Journal of Physics, 56, B996-B1001.
https://doi.org/10.1007/s10582-006-0316-y

Radmilović-Rađenović M, Petrovic ZL, Malović GN, Maric D. Modelling of low-pressure gas breakdown in uniform DC electric field by PIC technique with realistic secondary electron emission. in Czechoslovak Journal of Physics. 2006;56:B996-B1001.
doi:10.1007/s10582-006-0316-y .

Radmilović-Rađenović, Marija, Petrovic, Z. Li., Malović, Gordana N., Maric, D., "Modelling of low-pressure gas breakdown in uniform DC electric field by PIC technique with realistic secondary electron emission" in Czechoslovak Journal of Physics, 56 (2006):B996-B1001,
https://doi.org/10.1007/s10582-006-0316-y . .