Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range

Radovanović, Jelena; Ramović, S.; Daničić, Aleksandar; Milanović, V.

doi:10.1007/s00339-012-7343-2

Cited by 5 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, and (11) Unlike in the case of the refractive index of the QC structure, the wave vector refractive index always has a positive value.…”

Section: Theoretical Considerationsmentioning

confidence: 95%

“…One way to compensate for the losses is to include an active photonic material in the MTM structure as a source of gain, which is provided via the process of stimulated photon emission [10]. The THz frequency range is gener ally very interesting for the investigation of active photonic MTMs, since structures with subwavelength dimensions can be readily obtained using modern fabrication techniques, and photonic gain is available through intersubband transitions in THz quantum cascade laser (QCL) [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range

Daničić¹,

Radovanović²,

Ramović³

et al. 2016

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…, and (11) Unlike in the case of the refractive index of the QC structure, the wave vector refractive index always has a positive value.…”

Section: Theoretical Considerationsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range

Daničić¹,

Radovanović²,

Ramović³

et al. 2016

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The THz frequency range is well suited for exploration of such phenomena, since quantum cascaded structures with subwavelength dimensions can be readily obtained using modern fabrication techniques, and optical gain is available through intersubband transitions in THz quantum cascade laser (QCL) [11].…”

Section: Introductionmentioning

confidence: 99%

Possibilities of achieving negative refraction in QCL-based semiconductor metamaterials in the THz spectral range

et al. 2014

View full text Add to dashboard Cite

This is a repository copy of Possibilities of achieving negative refraction in QCL- ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.-1- Possibilities of achieving negative refraction in QCL- Abstract:One of the challenges in the design of metamaterialsÕ 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.

show abstract

Fully self-consistent analysis of III-nitride quantum cascade structures

Saha

Kumar

2016

J Comput Electron

View full text Add to dashboard Cite

Negative refraction in semiconductor metamaterials based on quantum cascade laser design for the mid-IR and THz spectral range

Cited by 5 publications

References 20 publications

Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range

Exploring negative refraction conditions for quantum cascade semiconductor metamaterials in the terahertz spectral range

Possibilities of achieving negative refraction in QCL-based semiconductor metamaterials in the THz spectral range

Fully self-consistent analysis of III-nitride quantum cascade structures

Contact Info

Product

Resources

About