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Blagosklonskaya, L. E., Gershenzon, E. M., Goltsman, G. N., & Elantev, A. I. (1978). Effect of strong magnetic-field on spectrum of hydrogen-like admixtures in semiconductors. In Izv. Akad. Nauk SSSR, Seriya Fizicheskaya (Vol. 42, pp. 1231–1234). Mezhdunarodnaya Kniga 39 Dimitrova Ul., 113095 Moscow, Russia.
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Gershenzon, E. M., Goltsman, G. N., & Orlov, L. (1976). Investigation of population and ionization of donor excited states in Ge. In Physics of Semiconductors (pp. 631–634). North-Holland Publishing Co.
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Baselmans, J. J. A., Hajenius, M., Gao, J., de Korte, P., Klapwijk, T. M., Voronov, B., et al. (2004). Doubling of sensitivity and bandwidth in phonon-cooled hot-electron bolometer mixers. In J. Zmuidzinas, W. S. Holland, & S. Withington (Eds.), Proc. SPIE (Vol. 5498, pp. 168–176). SPIE.
Abstract: NbN hot electron bolometer (HEB) mixers are at this moment the best heterodyne detectors for frequencies above 1 THz. However, the fabrication procedure of these devices is such that the quality of the interface between the NbN superconducting film and the contact structure is not under good control. This results in a contact resistance between the NbN bolometer and the contact pad. We compare identical bolometers, with different NbN – contact pad interfaces, coupled with a spiral antenna. We find that cleaning the NbN interface and adding a thin additional superconductor prior to the gold contact deposition improves the noise temperature and the bandwidth of the HEB mixers with more than a factor of 2. We obtain a DSB noise temperature of 950 K at 2.5 THz and a Gain bandwidth of 5-6 GHz. For use in real receiver systems we design small volume (0.15x1 micron) HEB mixers with a twin slot antenna. We find that these mixers combine good sensitivity (900 K at 1.6 THz) with low LO power requirement, which is 160 – 240 nW at the Si lens of the mixer. This value is larger than expected from the isothermal technique and the known losses in the lens by a factor of 3-3.5.
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Goltsman, G. (2017). Superconducting thin film nanostructures as terahertz and infrared heterodyne and direct detectors. In 16th ISEC (Th-I-QTE-03 (1 to 3)).
Abstract: We present our recent achievements in the development of superconducting nanowire single-photon detectors (SNSPDs) integrated with optical waveguides on a chip. We demonstrate both single-photon counting with up to 90% on-chipquantum-efficiency (OCDE), and the heterodyne mixing with a close to the quantum limit sensitivity at the telecommunication wavelength using single device.
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Averkin, A. S., Shishkin, A. G., Chichkov, V. I., Voronov, B. M., Goltsman, G. N., Karpov, A., et al. (2014). Tunable frequency-selective surface based on superconducting split-ring resonators. In 8th Metamaterials.
Abstract: We study a possibility to use the 2D superconducting metamaterial as a tunable frequency-selective surface (FSS). The proposed FSS is made of sub-wavelength size (l/14) metamaterial unit cells, where a split-ring resonator is embedded in a small iris aperture in a metal plane. The split-ring resonator is made of NbN film, and its resonance frequency is tuned by the temperature of the sample, changing the kinetic inductance of NbN film. The Ansoft HFSS simulation predicts the FSS tuning range of about 10-20 %. The developed superconducting FSS may be used as a tunable band-pass filter or modulator.
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