Publication

A sensitive YBaCuO thin film bolometer with ultrawide wavelength response

Davor Pavuna
1992
Journal Articles

Abstract

The authors have constructed two types of high-temperature superconducting (HTSC) bolometers, whose performance is essentially wavelength independent from λ0.6 to 450 μm: The first is a microbridge, of dimensions 20×20 μm, and the second is a meander, covering a region of 1 mm2. Both were fabricated by photolithography of a superconducting YBaCuO thin film on SrTiO3. The bolometers are current biased, and the AC voltage induced by the chopped radiation is measured using lock-in detection. Operating optimally in the vicinity of the transition temperature (90 K), the first bolometer shows responsivity S1 mV/(W/cm2), while the second gives S800 V/W. The response of the first bolometer for various chopping frequencies is basically S~~1/√f, which makes it usable at frequencies up to >50 kHz, while the second bolometer has a chopping-frequency response that is basically S~~1/f, with a cutoff frequency near 0.01 Hz

Official source

https://infoscience.epfl.ch/entities/publication/d0228ff2-2227-4504-a7b7-10381bd56395

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Davor Pavuna
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d0228ff2-2227-4504-a7b7-10381bd56395

About this result

Related concepts (29)

High-temperature superconductivity

High-temperature superconductors (abbreviated high-Tc or HTS) are defined as materials with critical temperature (the temperature below which the material behaves as a superconductor) above , the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which function at even colder temperatures, close to absolute zero. The "high temperatures" are still far below ambient (room temperature), and therefore require cooling.

Superconductivity

Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic fields are expelled from the material. Any material exhibiting these properties is a superconductor. Unlike an ordinary metallic conductor, whose resistance decreases gradually as its temperature is lowered, even down to near absolute zero, a superconductor has a characteristic critical temperature below which the resistance drops abruptly to zero.

Superconducting magnet

A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire has no electrical resistance and therefore can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce stronger magnetic fields than all but the strongest non-superconducting electromagnets, and large superconducting magnets can be cheaper to operate because no energy is dissipated as heat in the windings.

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A sensitive YBaCuO thin film bolometer with ultrawide wavelength response

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