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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III
DOIs
StatePublished - 2006
EventMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III - Orlando, FL, United States
Duration: May 29 2006May 31 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6275
ISSN (Print)0277-786X

Other

OtherMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Country/TerritoryUnited States
CityOrlando, FL
Period5/29/065/31/06

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Bolometers
  • Radiation detectors
  • Submillimeter wave detectors
  • Superconducting devices

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