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Proceedings Paper

An untrasensitive hot-electron bolometer for low-background SMM applications
Author(s): David Olaya; Jian Wei; Sergei Pereverzev; Boris S. Karasik; Jonathan H. Kawamura; William R. McGrath; Andrei V. Sergeyev; Michael E. Gershenson
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Paper Abstract

We are developing a hot-electron superconducting transition-edge sensor (TES) that is capable of counting THz photons and operates at T = 0.3K. The main driver for this work is moderate resolution spectroscopy (R ~ 1000) on the future space telescopes with cryogenically cooled (~ 4 K) mirrors. The detectors for these telescopes must be background-limited with a noise equivalent power (NEP) ~ 10-19-10-20 W/Hz1/2 over the range ν=0.3-10 THz. Above about 1 THz, the background photon arrival rate is expected to be ~ 10-100 s-1, and photon counting detectors may be preferable to an integrating type. We fabricated superconducting Ti nanosensors with a volume of ~ 3×10-3 μm3 on planar Si substrate and have measured the thermal conductance G to the thermal bath. A very low G=4×10-14 W/K, measured at 0.3 K, is due to the weak electron-phonon coupling in the material and the thermal isolation provided by superconducting Nb contacts. This low G corresponds to NEP(0.3K) = 3×10-19 W/Hz1/2. This Hot-Electron Direct Detector (HEDD) is expected to have a sufficient energy resolution for detecting individual photons with ν > 0.3 THz at 0.3 K. With the sensor time constant of a few microseconds, the dynamic range is ~ 50 dB.

Paper Details

Date Published: 27 June 2006
PDF: 7 pages
Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627506 (27 June 2006); doi: 10.1117/12.672303
Show Author Affiliations
David Olaya, Rutgers Univ. (United States)
Jian Wei, Rutgers Univ. (United States)
Sergei Pereverzev, Rutgers Univ. (United States)
Boris S. Karasik, Jet Propulsion Lab. (United States)
Jonathan H. Kawamura, Jet Propulsion Lab. (United States)
William R. McGrath, Jet Propulsion Lab. (United States)
Andrei V. Sergeyev, SUNY at Buffalo (United States)
Michael E. Gershenson, Rutgers Univ. (United States)

Published in SPIE Proceedings Vol. 6275:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington; William D. Duncan, Editor(s)

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