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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 16 — Jun. 1, 1998
  • pp: 3391–3397

Voltage-biased superconducting transition-edge bolometer with strong electrothermal feedback operated at 370 mK

Shih-Fu Lee, Jan M. Gildemeister, Warren Holmes, Adrian T. Lee, and Paul L. Richards  »View Author Affiliations


Applied Optics, Vol. 37, Issue 16, pp. 3391-3397 (1998)
http://dx.doi.org/10.1364/AO.37.003391


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Abstract

We present an experimental study of a composite voltage-biased superconducting bolometer (VSB). The tested VSB consists of a Ti-film superconducting thermometer (T c ∼ 375 mK) on a Si substrate suspended by NbTi superconducting leads. A resistor attached to the substrate provides calibrated heat input into the bolometer. The current through the bolometer is measured with a superconducting quantum interference device ammeter. Strong negative electrothermal feedback fixes the bolometer temperature at T c and reduces the measured response time from 2.6 s to 13 ms. As predicted, the measured current responsivity of the bolometer is equal to the inverse of the bias voltage. A noise equivalent power of 5 × 10-17 W/√Hz was measured for a thermal conductance G ∼ 4.7 × 10-10 W/K, which is consistent with the expected thermal noise. Excess noise was observed for bias conditions for which the electrothermal feedback strength was close to maximum.

© 1998 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology

History
Original Manuscript: November 17, 1997
Revised Manuscript: February 2, 1998
Published: June 1, 1998

Citation
Shih-Fu Lee, Jan M. Gildemeister, Warren Holmes, Adrian T. Lee, and Paul L. Richards, "Voltage-biased superconducting transition-edge bolometer with strong electrothermal feedback operated at 370 mK," Appl. Opt. 37, 3391-3397 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-16-3391


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References

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