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A cold electron bolometer using a two-dimensional electron gas absorber

Bacchus, Ian Dean, Mauskopf, Philip Daniel, Elliott, Martin, Morozov, Dmitry, Dunscombe, Christopher and Henini, Mohamed 2005. A cold electron bolometer using a two-dimensional electron gas absorber. Presented at: Space Terahertz Technology. International Symposium. 16th 2005. (ISSTT 2005), Gothenburg, Sweden, 2-4 May 2005. Published in: Ingvarson, M. ed. ISSTT 2005 : 16th International Symposium on Space Terahertz Technology, Göteborg, Sweden, May 2-4, 2005 : Conference Proceedings. Gothenburg, Sweden: Curran Associates Inc, pp. 134-138.

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We describe a new type of Terahertz (THz) detector using a two-dimensional electron gas (2DEG) hot electron bolometer where the temperature of the electrons read out using superconducting tunnel junctions connected to the 2DEG (similar to a SINIS detector). We present measurements of the electron-phonon thermal conductivity in a high-mobility GaAs/AlGaAs 2DEG sample at 4.2 K as a function of electron temperature and magnetic field. From these measurements we estimate the sensitivity of an element in a filled array of S-2DEG-S detectors at 4.2 K to be approximately 10-14 W/[square root]Hz with a response time of 1 ns. Using measured parameters for the normal resistance of the S-2DEG-S contacts, we calculate the effect of using a voltage bias to cool the electrons in the absorber significantly from a 300 mK base temperature. In this configuration, these detectors can achieve sufficient sensitivity to detect individual THz photons.

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: 9781627486316
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Last Modified: 23 Jan 2020 04:04

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