An untrasensitive hot-electron bolometer for low-background SMM applications

Details An untrasensitive hot-electron bolometer for low-background SMM applications An untrasensitive hot-electron bolometer for low-background SMM applications

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6275e...5o&link_type=abstract

Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III. Edited by Zmuidzinas, Jonas; Holland, Wayne S.; W

Astronomy and Astrophysics

Astronomy

2

Scientific paper

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.

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