Voltage-biased superconducting transition-edge bolometer with strong electrothermal feedback operated at 370 mK
- Department of Physics and the Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720-7300 (United States)
We present an experimental study of a composite voltage-biased superconducting bolometer (VSB). The tested VSB consists of a Ti-film superconducting thermometer ( T{sub c}{approximately}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{sub 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{times}10{sup {minus}17} W/{radical}()Hz was measured for a thermal conductance G{approximately}4.7{times}10{sup {minus}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. {copyright} 1998 Optical Society of America
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 639815
- Journal Information:
- Applied Optics, Vol. 37, Issue 16; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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