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Record Details

Record 2 of 2804
An Ultrasensitive Hot-Electron Bolometer for Low-Background SMM Applications
External Online Source: hdl:2014/40715
Author and Affiliation:
Olayaa, David(Rutgers Univ., Dept. of Physics and Astronomy, Piscataway, NJ, United States)
Wei, Jian(Rutgers Univ., Dept. of Physics and Astronomy, Piscataway, NJ, United States)
Pereverzev, Sergei(Rutgers Univ., Dept. of Physics and Astronomy, Piscataway, NJ, United States)
Karasik, Boris S.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Kawamura, Jonathan H.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
McGrath, William R.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Sergeev, Andrei V.(State Univ. of New York, Buffalo, NY, United States)
Gershenson, Michael E.(Rutgers Univ., Dept. of Physics and Astronomy, Piscataway, NJ, 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 approx. 1000) on the future space telescopes with cryogenically cooled (approx. 4 K) mirrors. The detectors for these telescopes must be background-limited with a noise equivalent power (NEP) approx. 10(exp -19)-10(exp -20) W/Hz(sup 1/2) over the range v = 0.3-10 THz. Above about 1 THz, the background photon arrival rate is expected to be approx. 10-100/s), and photon counting detectors may be preferable to an integrating type. We fabricated superconducting Ti nanosensors with a volume of approx. 3x10(exp -3) cubic microns on planar substrate and have measured the thermal conductance G to the thermal bath. A very low G = 4x10(exp -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) = 3x10(exp -19) W/Hz(sup 1/2). 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 approx. 50 dB.
Publication Date: May 24, 2006
Document ID:
20080013263
(Acquired Mar 20, 2008)
Subject Category: ASTRONOMY
Document Type: Preprint
Meeting Information: SPIE Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III; 24-31 May 2006; Orlando, Fl; United States
Contract/Grant/Task Num: NNG04GD55G
Financial Sponsor: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 7p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BOLOMETERS; HOT ELECTRONS; SUPERCONDUCTIVITY; THERMAL CONDUCTIVITY; DYNAMIC RANGE; SPACEBORNE TELESCOPES; PHOTONS; SUBSTRATES; TIME CONSTANT; FABRICATION; COUNTING
Other Descriptors: BOLOMETERS; RADIATION DETECTORS; SUBMILLIMETER WAVE DETECTORS; SUPERCONDUCTING DEVICES; TRANSITION EDGE SENSOR
Miscellaneous Notes: Sponsored in part by the Rutgers Academic Excellence Fund
Availability Source: Other Sources
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