@inproceedings{5f3694095cdc485ca8f2b3e1b8ddf77c,
title = "An untrasensitive hot-electron bolometer for low-background SMM applications",
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 v = 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 v > 0.3 THz at 0.3 K. With the sensor time constant of a few microseconds, the dynamic range is ∼ 50 dB.",
keywords = "Bolometers, Radiation detectors, Submillimeter wave detectors, Superconducting devices",
author = "David Olaya and Jian Wei and Sergei Pereverzev and Karasik, {Boris S.} and Kawamura, {Jonathan H.} and McGrath, {William R.} and Sergeyev, {Andrei V.} and Gershenson, {Michael E.}",
year = "2006",
doi = "10.1117/12.672303",
language = "English (US)",
isbn = "081946340X",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III",
note = "Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III ; Conference date: 29-05-2006 Through 31-05-2006",
}