Superconducting hot-electron bolometer mixer as element of thermal imager matrix

R. V. Ozhegov, K. N. Gorshkov, O. V. Okunev, G. N. Gol'tsman

Moscow State Pedagogical University

Abstract: The possibility of using a matrix of sensitive elements on a 12-mm-diameter hyperhemispherical lens in a thermal imager operating in the terahertz range has been studied. Dimensions of a lens region acceptable for arrangement of the matrix, in which the receiver noise temperature varies within 16% of the mean value, are determined to be 3.3% of the lens diameter. Deviations of the main lobe of the directivity pattern are evaluated, which amount to $\pm$ 1.25$^\circ$ relative to the direction toward the optimum position of a mixer. The fluctuation sensitivity of the receiver measured in experiment is 0.5 K at a frequency of 300 GHz.

Received: 01.06.2010

 English version: Technical Physics Letters, 2010, 36:11, 1006–1008

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