THz direct detector with 2D electron gas periodic structure absorber.

D. Morozov, Philip Mauskopf, I. Bacchus, M. Elliott, C. Dunscombe, M. Hopkinson, M. Henini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationProceedings of the Eighteenth International Symposium on Space Terahertz Technology 2007, ISSTT 2007
Pages123-127
Number of pages5
StatePublished - 2007
Externally publishedYes
Event18th International Symposium on Space Terahertz Technology 2007, ISSTT 2007 - Pasadena, CA, United States
Duration: Mar 21 2007Mar 23 2007

Other

Other18th International Symposium on Space Terahertz Technology 2007, ISSTT 2007
CountryUnited States
CityPasadena, CA
Period3/21/073/23/07

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ASJC Scopus subject areas

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation

Cite this

Morozov, D., Mauskopf, P., Bacchus, I., Elliott, M., Dunscombe, C., Hopkinson, M., & Henini, M. (2007). THz direct detector with 2D electron gas periodic structure absorber. In Proceedings of the Eighteenth International Symposium on Space Terahertz Technology 2007, ISSTT 2007 (pp. 123-127)