Optical response of a cold-electron bolometer array
Artikel i vetenskaplig tidskrift, 2010

A multielement bolometric receiver system has been developed to measure the power and polarization of radiation at a calculated frequency of 345 GHz. Arrays of ten series-parallel connected cold-electron bolometers have been pairwise integrated into orthogonal ports of a cross-slot antenna. Arrays are connected in parallel in the high-frequency input signal and in series in the output signal, which is measured at a low frequency, and in a dc bias. Such an array makes it possible to increase the output resistance by two orders of magnitude as compared to an individual bolometer under the same conditions of high-frequency matching and to optimize the matching with the JFET amplifier impedance up to dozens of megohms. Parallel connection ensures matching of the input signal to the cross-slot antenna with an impedance of 30 Omega on a massive silicon dielectric lens. At a temperature of 100 mK, a response to the thermal radiation of a thermal radiation source with an emissivity of 0.3, which covers the input aperture of the antenna and is heated to 3 K, is 25 mu V/K. Taking into account real noise, the optical fluctuation dc sensitivity is 5 mK, the estimated sensitivity corresponding to the noise of the amplifier is about 10(-4) K/Hz(1/2), and the noise-equivalent power is about (1-5) x 10(-17) W/Hz(1/2).


electrothermal feedback


Mikhail Tarasov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Leonid Kuzmin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Valerian S. Edelman

Russian Academy of Sciences

Natalia Kaurova

Moscow State Pedagogical University

M. Y. Fominskii

National Research University of Electronic Technology (MIET)

Andrey B. Ermakov

National Research University of Electronic Technology (MIET)

JETP Letters

0021-3640 (ISSN) 1090-6487 (eISSN)

Vol. 92 416-420