TY  - JOUR
AU  - Daničić, Aleksandar
AU  - Radovanović, Jelena V.
AU  - Ramović, Sabina
AU  - Milanović, Vitomir B.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/927
AB  - In order to avoid losses in metamaterial unit cells at frequencies of interest, caused by metallic inclusions, an active medium design has been proposed. As candidate structures for this active medium, we have chosen quantum cascade lasers because of their high output gain. Here we analyze and compare two quantum cascade structures that emit at 4.6 THz and 3.9 THz, respectively, placed under the influence of a strong magnetic field. We first solve the full system of rate equations for all relevant Landau levels, and obtain the necessary information about carrier distribution among the levels, after which we are able to evaluate the permittivity component along the growth direction of the structure. With these data one can determine the conditions under which negative refraction occurs, and calculate the values of the refractive index of the structure, as well as the range of frequencies at which the structure exhibits negative refraction for a predefined total electron sheet density.
PB  - IOP Publishing Ltd
T2  - Journal of Physics. D: Applied Physics
T1  - Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range
VL  - 49
IS  - 8
DO  - 10.1088/0022-3727/49/8/085105
ER  - 

@article{
author = "Daničić, Aleksandar and Radovanović, Jelena V. and Ramović, Sabina and Milanović, Vitomir B.",
year = "2016",
abstract = "In order to avoid losses in metamaterial unit cells at frequencies of interest, caused by metallic inclusions, an active medium design has been proposed. As candidate structures for this active medium, we have chosen quantum cascade lasers because of their high output gain. Here we analyze and compare two quantum cascade structures that emit at 4.6 THz and 3.9 THz, respectively, placed under the influence of a strong magnetic field. We first solve the full system of rate equations for all relevant Landau levels, and obtain the necessary information about carrier distribution among the levels, after which we are able to evaluate the permittivity component along the growth direction of the structure. With these data one can determine the conditions under which negative refraction occurs, and calculate the values of the refractive index of the structure, as well as the range of frequencies at which the structure exhibits negative refraction for a predefined total electron sheet density.",
publisher = "IOP Publishing Ltd",
journal = "Journal of Physics. D: Applied Physics",
title = "Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range",
volume = "49",
number = "8",
doi = "10.1088/0022-3727/49/8/085105"
}

Daničić, A., Radovanović, J. V., Ramović, S.,& Milanović, V. B.. (2016). Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range. in Journal of Physics. D: Applied Physics
IOP Publishing Ltd., 49(8).
https://doi.org/10.1088/0022-3727/49/8/085105

Daničić A, Radovanović JV, Ramović S, Milanović VB. Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range. in Journal of Physics. D: Applied Physics. 2016;49(8).
doi:10.1088/0022-3727/49/8/085105 .

Daničić, Aleksandar, Radovanović, Jelena V., Ramović, Sabina, Milanović, Vitomir B., "Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range" in Journal of Physics. D: Applied Physics, 49, no. 8 (2016),
https://doi.org/10.1088/0022-3727/49/8/085105 . .

TY  - JOUR
AU  - Radovanović, Jelena V.
AU  - Ramović, Sabina
AU  - Daničić, Aleksandar
AU  - Milanović, Vitomir B.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5171
AB  - We have considered the realization of metamaterials based on semiconductor quantum nanostructures, in particular, with the structural arrangement as in quantum cascade laser (QCL) designed to achieve optical gain in the mid-infrared and terahertz part of the spectrum. The entire structure is placed in a strong external magnetic field, which facilitates the attainment of sufficient population inversion, necessary to manipulate the permittivity, and enable a left-handed regime.
T2  - Applied Physics. A: Materials Science and Processing
T1  - Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range
VL  - 109
IS  - 4
SP  - 763
EP  - 768
DO  - 10.1007/s00339-012-7343-2
ER  - 

@article{
author = "Radovanović, Jelena V. and Ramović, Sabina and Daničić, Aleksandar and Milanović, Vitomir B.",
year = "2012",
abstract = "We have considered the realization of metamaterials based on semiconductor quantum nanostructures, in particular, with the structural arrangement as in quantum cascade laser (QCL) designed to achieve optical gain in the mid-infrared and terahertz part of the spectrum. The entire structure is placed in a strong external magnetic field, which facilitates the attainment of sufficient population inversion, necessary to manipulate the permittivity, and enable a left-handed regime.",
journal = "Applied Physics. A: Materials Science and Processing",
title = "Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range",
volume = "109",
number = "4",
pages = "763-768",
doi = "10.1007/s00339-012-7343-2"
}

Radovanović, J. V., Ramović, S., Daničić, A.,& Milanović, V. B.. (2012). Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range. in Applied Physics. A: Materials Science and Processing, 109(4), 763-768.
https://doi.org/10.1007/s00339-012-7343-2

Radovanović JV, Ramović S, Daničić A, Milanović VB. Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range. in Applied Physics. A: Materials Science and Processing. 2012;109(4):763-768.
doi:10.1007/s00339-012-7343-2 .

Radovanović, Jelena V., Ramović, Sabina, Daničić, Aleksandar, Milanović, Vitomir B., "Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range" in Applied Physics. A: Materials Science and Processing, 109, no. 4 (2012):763-768,
https://doi.org/10.1007/s00339-012-7343-2 . .