ISSTT Proceedings

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Comparison Of Two Types Of Andreev Reflection Hot-Electron Microbolometer For Submillimeter Radio Astronomy

Authors:
A.N. Vystavkin
Abstract:
Review and analysis of results of theoretical estimations and measurements of characteristics of an Andreev reflection hot electron direct detection microbolometer for submillimeter radio astronomy made by different researchers are given. The consideration is limited to the case when minimized in dimensions absorber of the microbolotneter is antenna coupled and together with antenna are deposited directly onto substrate without a membrane or spider web and cooled to approximately 100 mK what provides the best noise equivalent power. A comparison of peculiarities and characteristics of the microbolometers using two types of sensors - the SIN junction sensor and the transition edge sensor (TES) with electrothermal feedback - for the read-out of a signal arising from the electron temperature increment under the influence of submillimeter radiation is presented. Advantages of the microbolometer with the second type of the sensor when the TES is used simultaneously as the absorber of radiation are shown. Methods of achievement of the best noise equivalent power of the microbolometer in such version as well as methods of the matching of the microbolometer with the incident radiation flow and with the channel of the output signal read-out are considered.
Categories:
Hot Electron Bolometers
Year:
2000
Session:
4
Full-text:
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Page Number(s):
197-208