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Avtometriya

2011 year, number 5

Application of Uncooled Microbolometer Detector Arrays for Recording Radiation of the Terahertz Spectral Range

M. A. Dem'yanenko1, D. G. Esaev1, I. V. Marchishin1, V. N. Ovsyuk1, B. I. Fomin1, B. A. Knyazev2, V. V. Gerasimov2
1 Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Science
2 Budker Institute of Nuclear Physics, Siberian Branch of Russian Academy of Sciences Novosibirsk State University
dem_yanenko@thermo.isp.nsc.ru, esaev@thermo.isp.nsc.ru, march@thermo.isp.nsc.ru, acelle@isp.nsc.ru, fomin@thermo.isp.nsc.ru, knyazev@inp.nsk.su
Keywords: uncooled microbolometer, vanadium oxide, terahertz radiation, polarization, sensitivity, microantenna, free-electron laser
Pages: 109-113

Abstract

The mechanism of occurrence of sensitivity of microbolometer detector arrays based on vanadium oxide to terahertz radiation are analyzed. Experimental data are given showing the possibility of increasing the sensitivity of microbolometer detectors in the terahertz range by using an additional thin metal absorbing layer applied on the microbolometer membrane. A polarization dependence of the sensitivity of microbolometers in the terahertz and far infrared spectral ranges is found. It is shown that the sensitivity of microbolometers in the terahertz range is due to the absorption of radiation in the narrow metal runs placed on the support legs of the microbolometers and playing the role of an ohmic contact between the heat-sensitive layer and the processing curcuit.