A superconducting bolometer with strong electrothermal feedback

Applied Physics Letters - Tập 69 Số 12 - Trang 1801-1803 - 1996
Adrian T. Lee1, Paul L. Richards1, Sae Woo Nam2, Blas Cabrera2, K. D. Irwin3
1Department of Physics, University of California, Berkeley, California, 94720
2Department of Physics, Stanford University, Stanford, California 94305-4060,
3National Institute of Science and Technology, Boulder, Colorado 80303

Tóm tắt

We present a theoretical analysis and experimental evaluation of a transition-edge superconducting bolometer for detecting infrared and millimeter waves. The superconducting film is voltage biased and the current is read by a superconducting quantum interference device ammeter. Strong electrothermal feedback maintains the sensor temperature within the transition, gives a current responsivity that is simply the inverse of the bias voltage, and reduces the response time by several orders of magnitude below the intrinsic time constant C/G. We evaluated a voltage-biased bolometer that operates on the Tc∼95 mK transition of a tungsten film with a thermal conductance of G∼1.2×10−9 W/K. As expected, the electrical noise equivalent power of 3.3×10−17/W√Hz is close to the thermal fluctuation noise limit and is lower than that of other technologies for these values of G and temperature. The measured time constant of 10 μs is ∼100 times faster than the intrinsic time constant.

Từ khóa


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Applied Physics Letters

Tập 69 Số 12

1801-1803

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