Emission of terahertz radiation from two-dimensional electron systems in semiconductor nano-heterostructures

Otsuji, T.; Karasawa, Hiroshi; Watanabe, Takayuki; Suemitsu, Tetsuya; Suemitsu, Maki; Sano, Eiichi; Knap, W.; Ryzhii, V.

doi:10.1016/j.crhy.2010.04.002

Cited by 13 publications

(7 citation statements)

References 54 publications

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“…A periodic system of metallic gates (i.e., a metallic grating) plays a role of specific antenna element that provides efficient coupling of relatively long-wavelength THz-range EM-radiation with short-wavelength plasmons. Resonant detection and amplification of THz radiations have recently been studied for the multi-gated field-effect transistors [5][6][7][8]. Moreover, similar multi-contact devices can be utilized as modulators and polarizers for the THz radiation [9,10].…”

Section: Introductionmentioning

confidence: 99%

Interaction of terahertz electromagnetic field with a metallic grating: Near-field zone

Lyaschuk¹,

Korotyeyev²

2012

Ukr. J. Phys. Opt.

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Abstract. We have developed a theory for the interaction of THz radiation with a sub-wavelength metallic grating. The structure of electric field of the electromagnetic waves under the metallic grating has been studied for the near-field zone. Spatial distributions of the electric field components and the electric energy density have been obtained for the wave transmitted through the grating. An effect of strong local enhancement of the electric field has been detected. Spatial dependence of polarisation of the transmitted wave has been analysed for the near-field zone.

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Section: Introductionmentioning

confidence: 99%

Interaction of terahertz electromagnetic field with a metallic grating: Near-field zone

Lyaschuk¹,

Korotyeyev²

2012

Ukr. J. Phys. Opt.

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“…Due to its unique conical and symmetric band structure, graphene has been proposed for a rich array of novel devices and applications. Its optical properties have also been extensively explored, however, to date there are only a few studies of graphene-based THz devices in the literature including emitters [12][13][14][15] , detectors [16][17][18][19] and nano-antennas 20 . In this work, we present a proposal of graphene-based THz modulators for the first time, to the best of our knowledge.…”

Section: Manuscript Textmentioning

confidence: 99%

Unique prospects for graphene-based terahertz modulators

Sensale‐Rodriguez¹,

Tian²,

Yan³

et al. 2011

Applied Physics Letters

198

128

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The modulation depth of 2-D electron gas (2DEG) based THz modulators using AlGaAs/GaAs heterostructures with metal gates is inherently limited to < 30%. The metal gate not only attenuates the THz signal (> 90%) but also severely degrades the modulation depth. The metal losses can be significantly reduced with an alternative material with tunable conductivity. Graphene presents a unique solution to this problem due to its symmetric band structure and extraordinarily high mobility of holes that is comparable to electron mobility in conventional semiconductors. The hole conductivity in graphene can be electrostatically tuned in the graphene-2DEG parallel capacitor configuration, thus more efficiently tuning the THz transmission. In this work, we show that it is possible to achieve a modulation depth of > 90% while simultaneously minimizing signal attenuation to < 5% by tuning the Fermi level at the Dirac point in graphene.

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“…Indeed, in spite of great successes in this field, the problem of the development of compact, highly efficient devices with electrical pumping and electrical control of working frequencies remains actual [1][2][3]. The usage of the hybrid plasmonic structures, as the core elements for such devices, is perspective and has a great potential.…”

Section: Introductionmentioning

confidence: 99%

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

Lyaschuk¹,

Korotyeyev²

2017

Ukr. J. Phys.

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The theory of non-linear interaction of electromagnetic radiation with hybrid plasmonic structure, which consists of the two-dimensional quantum heterostructure integrated with a plasmonic element in the form of a metal grating, is developed. In particular, the non-linear effect of a detection of high-frequency radiation by a drifting two-dimensional electron gas is examined. Based on the self-consistent solutions of the Maxwell and non-linear hydrodynamic equations in the frames of consistent perturbation theory of the second order, the expression of a photoresponse in the THz region is found. It is shown that the obtained expression contains an additional factor corresponding to the radiative decay rate. The latter was omitted in the previous theories. The presented theory is applied to the analysis of high-frequency properties of hybrid plasmonic structures on the basis of AlGaAs/GaAs quantum heterostructure. The influences of an optically thick substrate and the effect of the electron heating under high electron drifts on the spectral characteristics of the transmission/absorption coefficients and on the photoresponse spectra are analyzed. Some recommendations as for the design of efficient terahertz radiation detectors with the use of the hybrid plasmonic structures as a core element are given. K e y w o r d s: THz plasmonics, THz detection, hybrid plasmonic structures.

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Emission of terahertz radiation from two-dimensional electron systems in semiconductor nano-heterostructures

Cited by 13 publications

References 54 publications

Interaction of terahertz electromagnetic field with a metallic grating: Near-field zone

Interaction of terahertz electromagnetic field with a metallic grating: Near-field zone

Unique prospects for graphene-based terahertz modulators

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

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