THz direct detector with 2D electron gas periodic structure absorber

Morozov, Dmitry L., Mauskopf, Philip Daniel ORCID: https://orcid.org/0000-0001-6397-5516, Bacchus, Ian Dean, Elliott, Martin, Dunscombe, Christopher, Hopkinson, M. and Henini, M. 2007. THz direct detector with 2D electron gas periodic structure absorber. Presented at: 18th International Symposium on Space Terahertz Technology 2007 (ISSTT 2007), Pasadena, CA, USA, 21-23 March 2007. Published in: Karpov, Alexandre ed. 8th International Symposium on Space Terahertz Technology 2007. Pittsburgh, Pa: Curran Associates Inc,

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Abstract

We describe the performance of a direct detector that uses the high mobility 2D electron gas (2DEG) formed at the AlGaAs/GaAs interface as a frequency selective absorber. The 2DEG mesa-structure is etched to form a planar periodic structure with resonant absorption properties in the submm - THz region. Electrons in the 2DEG are heated by incoming radiation above the lattice temperature and the temperature of the hot electrons is measured by Superconducting - 2DEG - Superconducting (S-2DEG-S) tunnel junctions. The estimated noise equivalent power for such a detector at 100 mK is in order of 10-18 W/Hz1/2. In this paper we present the spectral measurements and simulated results of absorption properties at 4.2 K for a resonant mesa geometry. The thermal conductance and time constant of 2D electrons are studied at 450 mK-4.2 K. We measure an electron-phonon conductance on the order of 10-17 W/K per electron at 450 mK which gives a low value of heat conductance 2DEG relative to normal metal absorbers due to the low 2DEG electron density. These devices have a combination of sensitivity and speed which makes them possible candidates for the components in future astrophysical THz instruments.

Item Type:	Conference or Workshop Item (Poster)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Curran Associates Inc
ISBN:	9781615673438
Last Modified:	27 Oct 2022 09:14
URI:	https://orca.cardiff.ac.uk/id/eprint/64904

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