Vukovic, N, Danicic, A, Radovanovic, J et al. (2 more authors) (2015) Possibilities of achieving negative refraction in QCL-based semiconductor metamaterials in the THz spectral range. Optical and Quantum Electronics, 47 (4). 883 - 891. ISSN 0306-8919
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Springer Science+Business Media New York 2014. This is an author produced version of a paper published in Optical and Quantum Electronics. The final publication is available at Springer via http://dx.doi.org/10.1007/s11082-014-0020-2 |
Keywords: | Semiconductor metamaterials; Quantum cascade laser; Magnetic field; Negative refraction |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Jan 2016 14:31 |
Last Modified: | 11 Apr 2017 10:43 |
Published Version: | http://dx.doi.org/10.1007/s11082-014-0020-2 |
Status: | Published |
Publisher: | Springer Verlag |
Identification Number: | 10.1007/s11082-014-0020-2 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:93040 |