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Proceedings Paper

Antenna-coupled direct detector for millimetre and submillimetre astronomy based on 2D electron gas in semiconducting heterostructure
Author(s): Dmitry Morozov; Philip Mauskopf; Christopher Dunscombe; Mohamed Henini
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Paper Abstract

The energy resolution of a detector is related to the figure of merit NEP×√τ which is proportional to the heat capacity of the detector. Hot electron (cold electron) devices have much lower heat capacity than bolometers with silicon nitride based thermal isolation. Traditional hot electron bolometers (HEB) require sub-micron fabrication for use at submm wavelengths and it is difficult to simultaneously couple radiation and read out these devices. The 2D electron gas (2DEG) in a semiconductor heterojunction effectively acts as a metal film with a thickness of a few angstroms and a tunable density and electron mobility. We describe a HEB that uses a 2DEG as an absorber and present simulations of optical coupling schemes for this type of detector including an antenna coupled to a coplanar waveguide with distributed 2DEG absorbers.

Paper Details

Date Published: 19 July 2008
PDF: 7 pages
Proc. SPIE 7020, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, 702021 (19 July 2008); doi: 10.1117/12.789753
Show Author Affiliations
Dmitry Morozov, Cardiff Univ. (United Kingdom)
Philip Mauskopf, Cardiff Univ. (United Kingdom)
Christopher Dunscombe, Cardiff Univ. (United Kingdom)
Mohamed Henini, Univ. of Nottingham (United Kingdom)

Published in SPIE Proceedings Vol. 7020:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV
William D. Duncan; Wayne S. Holland; Stafford Withington; Jonas Zmuidzinas, Editor(s)

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