27 June 2006 An untrasensitive hot-electron bolometer for low-background SMM applications
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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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David Olaya, David Olaya, Jian Wei, Jian Wei, Sergei Pereverzev, Sergei Pereverzev, Boris S. Karasik, Boris S. Karasik, Jonathan H. Kawamura, Jonathan H. Kawamura, William R. McGrath, William R. McGrath, Andrei V. Sergeyev, Andrei V. Sergeyev, Michael E. Gershenson, 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); doi: 10.1117/12.672303; https://doi.org/10.1117/12.672303

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