TY  - JOUR
AU  - Ilic, I.
AU  - Beličev, Petra
AU  - Milanović, Vitomir B.
AU  - Radovanović, Jelena V.
AU  - Hadžievski, Ljupčo
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5135
AB  - The aspects of light propagation through a semiconductor metamaterial (SMM) which consists of two alternating differently doped In0.53Ga0.47As layers are studied analytically and numerically. A general analytical expression for the effective index of refraction of the Poynting vector is derived for periodic structure composed of two alternating layers of absorptive and dispersive semiconductors and light propagation is simulated by finite-difference-time-domain method. Negative values of the effective refractive index with low absorption are observed in the mid-infrared frequency range. The main advantage of this design is the possibility to control the frequency region with negative effective refractive index by changing the doping densities of the layers.
T2  - Journal of Electromagnetic Waves and Applications
T1  - Refractive properties of metamaterial composed of InGaAs layers with alternating doping densities
VL  - 26
IS  - 17-18
SP  - 2323
EP  - 2331
DO  - 10.1080/09205071.2012.733507
ER  - 

@article{
author = "Ilic, I. and Beličev, Petra and Milanović, Vitomir B. and Radovanović, Jelena V. and Hadžievski, Ljupčo",
year = "2012",
abstract = "The aspects of light propagation through a semiconductor metamaterial (SMM) which consists of two alternating differently doped In0.53Ga0.47As layers are studied analytically and numerically. A general analytical expression for the effective index of refraction of the Poynting vector is derived for periodic structure composed of two alternating layers of absorptive and dispersive semiconductors and light propagation is simulated by finite-difference-time-domain method. Negative values of the effective refractive index with low absorption are observed in the mid-infrared frequency range. The main advantage of this design is the possibility to control the frequency region with negative effective refractive index by changing the doping densities of the layers.",
journal = "Journal of Electromagnetic Waves and Applications",
title = "Refractive properties of metamaterial composed of InGaAs layers with alternating doping densities",
volume = "26",
number = "17-18",
pages = "2323-2331",
doi = "10.1080/09205071.2012.733507"
}

Ilic, I., Beličev, P., Milanović, V. B., Radovanović, J. V.,& Hadžievski, L.. (2012). Refractive properties of metamaterial composed of InGaAs layers with alternating doping densities. in Journal of Electromagnetic Waves and Applications, 26(17-18), 2323-2331.
https://doi.org/10.1080/09205071.2012.733507

Ilic I, Beličev P, Milanović VB, Radovanović JV, Hadžievski L. Refractive properties of metamaterial composed of InGaAs layers with alternating doping densities. in Journal of Electromagnetic Waves and Applications. 2012;26(17-18):2323-2331.
doi:10.1080/09205071.2012.733507 .

Ilic, I., Beličev, Petra, Milanović, Vitomir B., Radovanović, Jelena V., Hadžievski, Ljupčo, "Refractive properties of metamaterial composed of InGaAs layers with alternating doping densities" in Journal of Electromagnetic Waves and Applications, 26, no. 17-18 (2012):2323-2331,
https://doi.org/10.1080/09205071.2012.733507 . .

TY  - JOUR
AU  - Ilic, I.
AU  - Beličev, Petra
AU  - Milanović, Vitomir B.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6951
AB  - Tunneling times in an anisotropic structure composed of alternately placed layers of two linear, dispersive and absorptive materials are analyzed in this paper. For such a structure, a general expression for the relation between the two most common tunneling time definitions, namely the dwell time and the group delay, is obtained. Numerical calculations are performed for a new type of semiconductor metamaterial. The results show a peak position frequency mismatch between the dwell time and the group delay, and between the dwell time and the absorption.
T2  - Physica Scripta
T1  - Modeling of tunneling times in anisotropic non-magnetic metamaterials
VL  - T149
DO  - 10.1088/0031-8949/2012/T149/014050
ER  - 

@article{
author = "Ilic, I. and Beličev, Petra and Milanović, Vitomir B.",
year = "2012",
abstract = "Tunneling times in an anisotropic structure composed of alternately placed layers of two linear, dispersive and absorptive materials are analyzed in this paper. For such a structure, a general expression for the relation between the two most common tunneling time definitions, namely the dwell time and the group delay, is obtained. Numerical calculations are performed for a new type of semiconductor metamaterial. The results show a peak position frequency mismatch between the dwell time and the group delay, and between the dwell time and the absorption.",
journal = "Physica Scripta",
title = "Modeling of tunneling times in anisotropic non-magnetic metamaterials",
volume = "T149",
doi = "10.1088/0031-8949/2012/T149/014050"
}

Ilic, I., Beličev, P.,& Milanović, V. B.. (2012). Modeling of tunneling times in anisotropic non-magnetic metamaterials. in Physica Scripta, T149.
https://doi.org/10.1088/0031-8949/2012/T149/014050

Ilic I, Beličev P, Milanović VB. Modeling of tunneling times in anisotropic non-magnetic metamaterials. in Physica Scripta. 2012;T149.
doi:10.1088/0031-8949/2012/T149/014050 .

Ilic, I., Beličev, Petra, Milanović, Vitomir B., "Modeling of tunneling times in anisotropic non-magnetic metamaterials" in Physica Scripta, T149 (2012),
https://doi.org/10.1088/0031-8949/2012/T149/014050 . .

TY  - JOUR
AU  - Kanshu, A.
AU  - Rueter, C. E.
AU  - Kip, D.
AU  - Shandarov, V.
AU  - Beličev, Petra
AU  - Ilic, I.
AU  - Stepić, Milutin
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4797
AB  - We consider, both experimentally and theoretically, the existence and stability of localized, symmetric, and anti-symmetric gap solitons (GSs) in binary lattices of identical waveguides but with alternating spacings. Furthermore, the properties of surface GSs at the boundary of the lattice are explored. (C) 2012 Optical Society of America
T2  - Optics Letters
T1  - Observation of discrete gap solitons in one-dimensional waveguide arrays with alternating spacings and saturable defocusing nonlinearity
VL  - 37
IS  - 7
SP  - 1253
EP  - 1255
DO  - 10.1364/OL.37.001253
ER  - 

@article{
author = "Kanshu, A. and Rueter, C. E. and Kip, D. and Shandarov, V. and Beličev, Petra and Ilic, I. and Stepić, Milutin",
year = "2012",
abstract = "We consider, both experimentally and theoretically, the existence and stability of localized, symmetric, and anti-symmetric gap solitons (GSs) in binary lattices of identical waveguides but with alternating spacings. Furthermore, the properties of surface GSs at the boundary of the lattice are explored. (C) 2012 Optical Society of America",
journal = "Optics Letters",
title = "Observation of discrete gap solitons in one-dimensional waveguide arrays with alternating spacings and saturable defocusing nonlinearity",
volume = "37",
number = "7",
pages = "1253-1255",
doi = "10.1364/OL.37.001253"
}

Kanshu, A., Rueter, C. E., Kip, D., Shandarov, V., Beličev, P., Ilic, I.,& Stepić, M.. (2012). Observation of discrete gap solitons in one-dimensional waveguide arrays with alternating spacings and saturable defocusing nonlinearity. in Optics Letters, 37(7), 1253-1255.
https://doi.org/10.1364/OL.37.001253

Kanshu A, Rueter CE, Kip D, Shandarov V, Beličev P, Ilic I, Stepić M. Observation of discrete gap solitons in one-dimensional waveguide arrays with alternating spacings and saturable defocusing nonlinearity. in Optics Letters. 2012;37(7):1253-1255.
doi:10.1364/OL.37.001253 .

Kanshu, A., Rueter, C. E., Kip, D., Shandarov, V., Beličev, Petra, Ilic, I., Stepić, Milutin, "Observation of discrete gap solitons in one-dimensional waveguide arrays with alternating spacings and saturable defocusing nonlinearity" in Optics Letters, 37, no. 7 (2012):1253-1255,
https://doi.org/10.1364/OL.37.001253 . .

TY  - JOUR
AU  - Ilic, I.
AU  - Beličev, Petra
AU  - Milanović, Vitomir B.
AU  - Radovanović, Jelena V.
AU  - Hadžievski, Ljupčo
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4242
AB  - We present an analysis of the influence of the Goos-Hanchen effect on tunneling times, group delay and dwell time, of electromagnetic waves propagating through an obstacle made of left-handed metamaterial embedded in a dielectric which exhibits saturable type of nonlinearity. The derived equations show that only the group delay, is affected by the Goos-Hanchen shift without any impact on the dwell time. Besides the reduction of the group delay, the most remarkable result is the possibility for total reduction of the Goos-Hanchen shift for finite incident angles. These phenomena are observable in the frequency region for which metamaterial exhibits negative index of refraction. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Physics Letters A
T1  - Goos-Hanchen shift and time delay in dispersive nonlinear media
VL  - 375
IS  - 10
SP  - 1357
EP  - 1361
DO  - 10.1016/j.physleta.2011.01.053
ER  - 

@article{
author = "Ilic, I. and Beličev, Petra and Milanović, Vitomir B. and Radovanović, Jelena V. and Hadžievski, Ljupčo",
year = "2011",
abstract = "We present an analysis of the influence of the Goos-Hanchen effect on tunneling times, group delay and dwell time, of electromagnetic waves propagating through an obstacle made of left-handed metamaterial embedded in a dielectric which exhibits saturable type of nonlinearity. The derived equations show that only the group delay, is affected by the Goos-Hanchen shift without any impact on the dwell time. Besides the reduction of the group delay, the most remarkable result is the possibility for total reduction of the Goos-Hanchen shift for finite incident angles. These phenomena are observable in the frequency region for which metamaterial exhibits negative index of refraction. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Physics Letters A",
title = "Goos-Hanchen shift and time delay in dispersive nonlinear media",
volume = "375",
number = "10",
pages = "1357-1361",
doi = "10.1016/j.physleta.2011.01.053"
}

Ilic, I., Beličev, P., Milanović, V. B., Radovanović, J. V.,& Hadžievski, L.. (2011). Goos-Hanchen shift and time delay in dispersive nonlinear media. in Physics Letters A, 375(10), 1357-1361.
https://doi.org/10.1016/j.physleta.2011.01.053

Ilic I, Beličev P, Milanović VB, Radovanović JV, Hadžievski L. Goos-Hanchen shift and time delay in dispersive nonlinear media. in Physics Letters A. 2011;375(10):1357-1361.
doi:10.1016/j.physleta.2011.01.053 .

Ilic, I., Beličev, Petra, Milanović, Vitomir B., Radovanović, Jelena V., Hadžievski, Ljupčo, "Goos-Hanchen shift and time delay in dispersive nonlinear media" in Physics Letters A, 375, no. 10 (2011):1357-1361,
https://doi.org/10.1016/j.physleta.2011.01.053 . .

TY  - JOUR
AU  - Kanshu, A.
AU  - Rueter, C. E.
AU  - Kip, D.
AU  - Beličev, Petra
AU  - Ilic, I.
AU  - Stepić, Milutin
AU  - Shandarov, V. M.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4193
AB  - We investigate linear and nonlinear light propagation at the interface of two one-dimensional homogeneous waveguide arrays containing a single defect of different strength. For the linear case and in a limited region of the defect size, we find trapped staggered and unstaggered modes. In the nonlinear case, we study the dependence of power thresholds for discrete soliton formation in different channels as a function of defect strength. All experimental results are confirmed theoretically using an adequate discrete model. (C) 2011 Optical Society of America
T2  - Optics Express
T1  - Linear and nonlinear light propagation at the interface of two homogeneous waveguide arrays
VL  - 19
IS  - 2
SP  - 1158
EP  - 1167
DO  - 10.1364/OE.19.001158
ER  - 

@article{
author = "Kanshu, A. and Rueter, C. E. and Kip, D. and Beličev, Petra and Ilic, I. and Stepić, Milutin and Shandarov, V. M.",
year = "2011",
abstract = "We investigate linear and nonlinear light propagation at the interface of two one-dimensional homogeneous waveguide arrays containing a single defect of different strength. For the linear case and in a limited region of the defect size, we find trapped staggered and unstaggered modes. In the nonlinear case, we study the dependence of power thresholds for discrete soliton formation in different channels as a function of defect strength. All experimental results are confirmed theoretically using an adequate discrete model. (C) 2011 Optical Society of America",
journal = "Optics Express",
title = "Linear and nonlinear light propagation at the interface of two homogeneous waveguide arrays",
volume = "19",
number = "2",
pages = "1158-1167",
doi = "10.1364/OE.19.001158"
}

Kanshu, A., Rueter, C. E., Kip, D., Beličev, P., Ilic, I., Stepić, M.,& Shandarov, V. M.. (2011). Linear and nonlinear light propagation at the interface of two homogeneous waveguide arrays. in Optics Express, 19(2), 1158-1167.
https://doi.org/10.1364/OE.19.001158

Kanshu A, Rueter CE, Kip D, Beličev P, Ilic I, Stepić M, Shandarov VM. Linear and nonlinear light propagation at the interface of two homogeneous waveguide arrays. in Optics Express. 2011;19(2):1158-1167.
doi:10.1364/OE.19.001158 .

Kanshu, A., Rueter, C. E., Kip, D., Beličev, Petra, Ilic, I., Stepić, Milutin, Shandarov, V. M., "Linear and nonlinear light propagation at the interface of two homogeneous waveguide arrays" in Optics Express, 19, no. 2 (2011):1158-1167,
https://doi.org/10.1364/OE.19.001158 . .

TY  - JOUR
AU  - Beličev, Petra
AU  - Ilic, I.
AU  - Radovanović, Jelena V.
AU  - Milanović, Vitomir B.
AU  - Hadžievski, Ljupčo
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6799
AB  - Time delays for an intense transverse electric wave propagating through a slab with saturable nonlinearity are investigated. The nonlinearity is assumed in a form of the Vinetskii-Kukhtarev model, which is relevant for the slabs made of nonlinear photorefractive crystals, such as GaAs and LiNbO(3), which feature a saturable nonlinearity. The expressions for the group delay and the dwell time are derived and the relation between them is studied. It is shown that the difference between them has three different contributions. The first one corresponds to the self-interference associated with the dispersion of the medium surrounding the slab. The other two appear due to the nonlinearity of the slab and oblique incidence of the transverse electric wave. All the results are compared with the case of dielectric slabs with cubic (Kerr) nonlinearity.
T2  - Acta Physica Polonica A
T1  - Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity
VL  - 115
IS  - 4
SP  - 834
EP  - 837
DO  - 10.12693/APhysPolA.115.834
ER  - 

@article{
author = "Beličev, Petra and Ilic, I. and Radovanović, Jelena V. and Milanović, Vitomir B. and Hadžievski, Ljupčo",
year = "2009",
abstract = "Time delays for an intense transverse electric wave propagating through a slab with saturable nonlinearity are investigated. The nonlinearity is assumed in a form of the Vinetskii-Kukhtarev model, which is relevant for the slabs made of nonlinear photorefractive crystals, such as GaAs and LiNbO(3), which feature a saturable nonlinearity. The expressions for the group delay and the dwell time are derived and the relation between them is studied. It is shown that the difference between them has three different contributions. The first one corresponds to the self-interference associated with the dispersion of the medium surrounding the slab. The other two appear due to the nonlinearity of the slab and oblique incidence of the transverse electric wave. All the results are compared with the case of dielectric slabs with cubic (Kerr) nonlinearity.",
journal = "Acta Physica Polonica A",
title = "Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity",
volume = "115",
number = "4",
pages = "834-837",
doi = "10.12693/APhysPolA.115.834"
}

Beličev, P., Ilic, I., Radovanović, J. V., Milanović, V. B.,& Hadžievski, L.. (2009). Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity. in Acta Physica Polonica A, 115(4), 834-837.
https://doi.org/10.12693/APhysPolA.115.834

Beličev P, Ilic I, Radovanović JV, Milanović VB, Hadžievski L. Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity. in Acta Physica Polonica A. 2009;115(4):834-837.
doi:10.12693/APhysPolA.115.834 .

Beličev, Petra, Ilic, I., Radovanović, Jelena V., Milanović, Vitomir B., Hadžievski, Ljupčo, "Time Delay in Thin Dielectric Slabs with Saturable Nonlinearity" in Acta Physica Polonica A, 115, no. 4 (2009):834-837,
https://doi.org/10.12693/APhysPolA.115.834 . .

TY  - JOUR
AU  - Ilic, I.
AU  - Beličev, Petra
AU  - Milanović, Vitomir B.
AU  - Radovanović, Jelena V.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6836
AB  - In this paper, a more general expression that describes the relationship between dwell time and group delay is derived. This expression is valid for all kinds of materials, including negative-index metamaterials (NIMs). An obstacle made of double-negative NIMs (DN-NIMs) and surrounded by a double-positive waveguide was used as a model. In the cases where the obstacle was made of left-handed materials and the surroundings were air, it has been shown that the dwell time and absorption have similar dependences on the incident wave frequency. On the other hand, group delay becomes negative in some cases. Numerical results show that an increase in the length of the obstacle leads to saturation of the dwell time and absorption, which is in accordance with the phenomenon known as the Hartman effect. Similar results were obtained for terahertz range of frequencies and for the dispersive waveguide. In this case, it is shown that there is a certain range of frequencies where group velocity is positive, whereas the phase velocity remains negative, i.e. the peak of the output pulse appears before the peak of the input pulse. Finally, the use of a model that considers an obstacle made of a lossless, non-magnetic metamaterial, with background permittivity equal to 1 and a dispersive waveguide, leads to the appearance of a new delay, called self-interference time.
T2  - Physica Scripta
T1  - Modeling of dwell time and group delay in dispersive and absorptive media
VL  - T135
DO  - 10.1088/0031-8949/2009/T135/014040
ER  - 

@article{
author = "Ilic, I. and Beličev, Petra and Milanović, Vitomir B. and Radovanović, Jelena V.",
year = "2009",
abstract = "In this paper, a more general expression that describes the relationship between dwell time and group delay is derived. This expression is valid for all kinds of materials, including negative-index metamaterials (NIMs). An obstacle made of double-negative NIMs (DN-NIMs) and surrounded by a double-positive waveguide was used as a model. In the cases where the obstacle was made of left-handed materials and the surroundings were air, it has been shown that the dwell time and absorption have similar dependences on the incident wave frequency. On the other hand, group delay becomes negative in some cases. Numerical results show that an increase in the length of the obstacle leads to saturation of the dwell time and absorption, which is in accordance with the phenomenon known as the Hartman effect. Similar results were obtained for terahertz range of frequencies and for the dispersive waveguide. In this case, it is shown that there is a certain range of frequencies where group velocity is positive, whereas the phase velocity remains negative, i.e. the peak of the output pulse appears before the peak of the input pulse. Finally, the use of a model that considers an obstacle made of a lossless, non-magnetic metamaterial, with background permittivity equal to 1 and a dispersive waveguide, leads to the appearance of a new delay, called self-interference time.",
journal = "Physica Scripta",
title = "Modeling of dwell time and group delay in dispersive and absorptive media",
volume = "T135",
doi = "10.1088/0031-8949/2009/T135/014040"
}

Ilic, I., Beličev, P., Milanović, V. B.,& Radovanović, J. V.. (2009). Modeling of dwell time and group delay in dispersive and absorptive media. in Physica Scripta, T135.
https://doi.org/10.1088/0031-8949/2009/T135/014040

Ilic I, Beličev P, Milanović VB, Radovanović JV. Modeling of dwell time and group delay in dispersive and absorptive media. in Physica Scripta. 2009;T135.
doi:10.1088/0031-8949/2009/T135/014040 .

Ilic, I., Beličev, Petra, Milanović, Vitomir B., Radovanović, Jelena V., "Modeling of dwell time and group delay in dispersive and absorptive media" in Physica Scripta, T135 (2009),
https://doi.org/10.1088/0031-8949/2009/T135/014040 . .

TY  - JOUR
AU  - Ilic, I.
AU  - Beličev, Petra
AU  - Milanović, Vitomir B.
AU  - Radovanović, Jelena V.
AU  - Hadžievski, Ljupčo
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6847
AB  - The Goos-Minchen effect is an optical phenomenon defined as a displacement of the reflected beam of linearly polarized light after the total internal reflection, which occurs perpendicularly to the direction of propagation. Due to this effect, when an optical wave propagates through a barrier, tunneling times may change accordingly. In this paper, we consider the impact of the Goos-Hanchen effect on group delay and dwell time for electromagnetic wave propagating through a nonlinear dispersive slab placed inside linear dispersive surroundings. Numerical calculations are performed for the special case, namely a double negative index metamaterial embedded into a material with a saturable nonlinearity, when a background medium is vacuum. The numerical results for tunneling times are calculated when the Goos-Hanchen effect is observed. It is shown that this approach gives more accurate expressions for tunneling times when the angle of incidence has a non-zero value.
T2  - Acta Physica Polonica A
T1  - Influence of the Goos-Hanchen Shift on Tunneling Times in Dispersive Nonlinear Media
VL  - 116
IS  - 4
SP  - 638
EP  - 641
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6847
ER  - 

@article{
author = "Ilic, I. and Beličev, Petra and Milanović, Vitomir B. and Radovanović, Jelena V. and Hadžievski, Ljupčo",
year = "2009",
abstract = "The Goos-Minchen effect is an optical phenomenon defined as a displacement of the reflected beam of linearly polarized light after the total internal reflection, which occurs perpendicularly to the direction of propagation. Due to this effect, when an optical wave propagates through a barrier, tunneling times may change accordingly. In this paper, we consider the impact of the Goos-Hanchen effect on group delay and dwell time for electromagnetic wave propagating through a nonlinear dispersive slab placed inside linear dispersive surroundings. Numerical calculations are performed for the special case, namely a double negative index metamaterial embedded into a material with a saturable nonlinearity, when a background medium is vacuum. The numerical results for tunneling times are calculated when the Goos-Hanchen effect is observed. It is shown that this approach gives more accurate expressions for tunneling times when the angle of incidence has a non-zero value.",
journal = "Acta Physica Polonica A",
title = "Influence of the Goos-Hanchen Shift on Tunneling Times in Dispersive Nonlinear Media",
volume = "116",
number = "4",
pages = "638-641",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6847"
}

Ilic, I., Beličev, P., Milanović, V. B., Radovanović, J. V.,& Hadžievski, L.. (2009). Influence of the Goos-Hanchen Shift on Tunneling Times in Dispersive Nonlinear Media. in Acta Physica Polonica A, 116(4), 638-641.
https://hdl.handle.net/21.15107/rcub_vinar_6847

Ilic I, Beličev P, Milanović VB, Radovanović JV, Hadžievski L. Influence of the Goos-Hanchen Shift on Tunneling Times in Dispersive Nonlinear Media. in Acta Physica Polonica A. 2009;116(4):638-641.
https://hdl.handle.net/21.15107/rcub_vinar_6847 .

Ilic, I., Beličev, Petra, Milanović, Vitomir B., Radovanović, Jelena V., Hadžievski, Ljupčo, "Influence of the Goos-Hanchen Shift on Tunneling Times in Dispersive Nonlinear Media" in Acta Physica Polonica A, 116, no. 4 (2009):638-641,
https://hdl.handle.net/21.15107/rcub_vinar_6847 .