Journal
OPTICAL AND QUANTUM ELECTRONICS
Volume 47, Issue 4, Pages 883-891Publisher
SPRINGER
DOI: 10.1007/s11082-014-0020-2
Keywords
Semiconductor metamaterials; Quantum cascade laser; Magnetic field; Negative refraction
Funding
- MPNS COST ACTION [MP1204-TERA-MIR]
- BMBS COST Action European Network for Skin Cancer Detection using Laser Imaging [BM1205]
- Ministry of Education, Science and Technological Development (Republic of Serbia) [III 45010]
- NATO SfP Grant [984068]
- Swiss National Science Foundation (SCOPES) [IZ73Z0_152761]
- Swiss National Science Foundation (SNF) [IZ73Z0_152761] Funding Source: Swiss National Science Foundation (SNF)
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One of the challenges in the design of metamaterials' unit cells is the reduction of losses caused by the metallic inclusions. In order to overcome this obstacle, it has been proposed to use the active medium as the unit cell. Quantum cascade lasers are great candidates for the active medium materials since they are able to provide high values of optical gain. In this paper we investigate and compare two quantum cascade structures optimized for emission frequencies lower than 2 THz and simulate the effect of a strong magnetic field applied perpendicularly to the layers. Comprehensive description of conduction-band nonparabolicity is used to calculate the electronic structure, and subsequently evaluate the longitudinal optical phonon and interface roughness scattering rates and solve the system of rate equations which govern the distribution of carriers among the Landau levels. Once we assess the degree of population inversion, we have all the necessary information about the permittivity component along the growth direction of the structure and may determine the conditions under which the structure displays negative refraction.
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