Active terahertz quantum-cascade composite right/left-handed metamaterial

Tavallaee, Amir A.; Hon, Philip W. C.; Chen, Qi-Sheng; Itoh, T.; Williams, Benjamin S.

doi:10.1063/1.4775666

Cited by 19 publications

(9 citation statements)

References 21 publications

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“…14,15 Alternatively, the E-field enhancement present within the capacitive structures suggests that such metasurfaces may be useful to enhance nonlinear optical effects.…”

Section: Discussionmentioning

confidence: 99%

“…14,15 Endfire operation is particularly interesting, since it allows directive beams to be achieved from THz QC-laser waveguides with subwavelength transverse dimensions. 8 The TM 00 waveguide mode is clearly not suitable for LWA operation.…”

Section: Discussionmentioning

confidence: 99%

“…LWAs for THz QC-lasers that exhibit both right hand (RH) only and CRLH operation have been demonstrated. 14,15 In this work, we experimentally characterize both bound and leaky-wave modes in passive THz CRLH waveguides. Since it is non-trivial to measure the S-parameters of a single waveguide in the THz range, we instead fabricate a uniaxial metasurface composed of dense arrays of passive THz CRLH waveguides and experimentally map their dispersion relation using angle-resolved reflection spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials

Hon

Liu

Itoh

et al. 2013

Journal of Applied Physics

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Prism coupling and reflection spectroscopy are used to characterize bound modes within composite right/left handed terahertz metamaterial waveguides. The cavity antenna model is used to understand the polarization dependence of the radiative coupling to TM 00 and TM 01 waveguide modes. Furthermore, the cavity model along with transmission-line theory is used to derive a surface impedance model for a waveguide array metasurface. Qualitative agreement with the experiment is observed, including a mode splitting for p-polarized surface waves at the light line and the existence of s-polarized magnetic spoof surface plasmons. V C 2013 American Institute of Physics. [http://dx

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“…14,15 Alternatively, the E-field enhancement present within the capacitive structures suggests that such metasurfaces may be useful to enhance nonlinear optical effects.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials

Hon

Liu

Itoh

et al. 2013

Journal of Applied Physics

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“…Nevertheless, they are essential for applications in THz imaging and sensing, while their ability to operate in continuous wave regime makes them suitable for high resolution THz spectroscopy [13,14]. Metal-metal THz QCL waveguides are the most suitable platform for active THz CRLM metamaterial implementation [4].…”

Section: Introductionmentioning

confidence: 99%

“…New artificially assembled effective media, electromagnetic composites named metamaterials (MTMs), with a predominant feature of exhibiting properties otherwise not found in nature, such as optical magnetism and negative refraction, have been investigated in recent years [1][2][3][4]. Metamaterials are comprised of composite elements patterned in periodic arrays, significantly smaller that the wavelength of interest so that the wave propagation occurs according to refraction through the effective medium, instead of diffraction, as it is the case of photonic crystals [5].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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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.

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Terahertz Metasurface Quantum Cascade VECSELs

Williams

2021

Vertical External Cavity Surface Emitting Lasers

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Active terahertz quantum-cascade composite right/left-handed metamaterial

Abstract: Active terahertz quantum-cascade composite right/left-handed metamaterial Permalink https://escholarship.org/uc/item/68n3h875 JournalApplied Physics Letters, 102(2)

Cited by 19 publications

References 21 publications

Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials

Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials

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

Terahertz Metasurface Quantum Cascade VECSELs

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