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

David Olaya; Jian Wei; Sergei Pereverzev; Boris S. Karasik; Jonathan H. Kawamura; William R. McGrath; Andrei V. Sergeyev; Michael E. Gershenson

doi:10.1117/12.672303

27 June 2006 An untrasensitive hot-electron bolometer for low-background SMM applications

David Olaya, Jian Wei, Sergei Pereverzev, Boris S. Karasik, Jonathan H. Kawamura, William R. McGrath, Andrei V. Sergeyev, Michael E. Gershenson

Author Affiliations +

Proceedings Volume 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III; 627506 (2006) https://doi.org/10.1117/12.672303
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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/Hz^1/2 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/Hz^1/2. 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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David Olaya, Jian Wei, Sergei Pereverzev, Boris S. Karasik, Jonathan H. Kawamura, William R. McGrath, Andrei V. Sergeyev, and Michael E. Gershenson "An untrasensitive hot-electron bolometer for low-background SMM applications", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627506 (27 June 2006); https://doi.org/10.1117/12.672303

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