Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range
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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.
Ključne reči:
metamaterials / quantum cascade structures / magnetic fieldIzvor:
Journal of Physics. D: Applied Physics, 2016, 49, 8Izdavač:
- IOP Publishing Ltd
Finansiranje / projekti:
- Fotonika mikro i nano strukturnih materijala (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45010)
- NATO SfP Grant [984068]
DOI: 10.1088/0022-3727/49/8/085105
ISSN: 0022-3727; 1361-6463
WoS: 000369480800014
Scopus: 2-s2.0-84957572430
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Institucija/grupa
VinčaTY - 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 . .