Terahertz transmission spectroscopy by Josephson oscillator and cold-electron bolometer

Mikhail A. Tarasov; Leonid S. Kuzmin; Evgueni Stepantsov; I. Agulo; A. Kalabukhov; A. Kidiyarova-Shevchenko; Tord Claeson

doi:10.1117/12.578038

8 December 2004 Terahertz transmission spectroscopy by Josephson oscillator and cold-electron bolometer

Mikhail A. Tarasov, Leonid S. Kuzmin, Evgueni Stepantsov, I. Agulo, A. Kalabukhov, A. Kidiyarova-Shevchenko, Tord Claeson

Author Affiliations +

Proceedings Volume 5619, Passive Millimetre-Wave and Terahertz Imaging and Technology; (2004) https://doi.org/10.1117/12.578038
Event: European Symposium on Optics and Photonics for Defence and Security, 2004, London, United Kingdom

Abstract

For sensitive wideband spectroscopy at TeraHertz frequencies one needs a wide-range electrically tunable THz source and a sensitive detector. In this paper a superconducting normal metal cold electron bolometer (CEB) was used as a broadband sensor. Bolometers were integrated with broadband log-periodic antenna designed for 0.2-2 THz frequency range and double-dipole antennas designed for 300 and 600 GHz central frequency. A Josephson junction was used as a wide band electrically tuned terahertz cryogenic oscillator. Bicrystal YBaCuO Josephson junctions demonstrated a characteristic voltage I_cR_n of over 4 mV that corresponds to characteristic frequency about 2 THz. The bolometer chip is attached to a Si substrate lens at 260 mK and the oscillator chip is attached to the sapphire substrate lens at 1.8 K, with lenses facing each other at the distance of few centimeters. High signal was measured in the whole frequency range up to 1.7 THz by simple changing the bias voltage of Josephson junction from zero to 3.5 mV. A voltage response of the bolometer up to 4*10⁸ V/W corresponds to an amplifier-limited technical noise equivalent power of the bolometer NEP=1.25*10^-17 W/Hz^1/2. Combining a Terahertz band Josephson junction, a high-sensitive hot electron bolometer, and a sample under test in between, makes it possible to develop a cryogenic compact Terahertz-band transmission spectrometer with a resolution below 1 GHz corresponding to the linewidth of Josephson oscillations. For frequencies below 600 GHz a conventional Nb shunted SIS junction can be used as Josephson oscillator.

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Mikhail A. Tarasov, Leonid S. Kuzmin, Evgueni Stepantsov, I. Agulo, A. Kalabukhov, A. Kidiyarova-Shevchenko, and Tord Claeson "Terahertz transmission spectroscopy by Josephson oscillator and cold-electron bolometer", Proc. SPIE 5619, Passive Millimetre-Wave and Terahertz Imaging and Technology, (8 December 2004); https://doi.org/10.1117/12.578038

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