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Gao, G. R., Hovenier, J. N., Yang, Z. Q., Baselmans, J. J. A., Baryshev, A., Hajenius, M., et al. (2005). A novel terahertz heterodyne receiver based on a quantum cascade laser and a superconducting bolometer. In Proc. 16th Int. Symp. Space Terahertz Technol. (pp. 19–23). Göteborg, Sweden.
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Gol'tsman, G., Korneev, A., Minaeva, O., Rubtsova, I., Milostnaya, I., Chulkova, G., et al. (2005). Superconducting nanostructured detectors capable of single-photon counting in the THz range. In Proc. 16th Int. Symp. Space Terahertz Technol. (pp. 555–557).
Abstract: We present the results of the NbN superconducting single-photon detector sensitivity measurement in the visible to mid-IR range. For visible and near IR light (0.56 — 1.3μm wavelengths) the detector exhibits 30% quantum efficiency saturation value limited by the NbN film absorption and extremely low level of dark counts (2x10 -4 s -1). The detector manifested single-photon counting up to 6 μm wavelength with the quantum efficiency reaching 10 -2 % at 5.6 μm and 3 K temperature.
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Hübers, H. W., Pavlov, S. G., Semenov, A. D., Tredicucci, A., Köhler, R., Mahler, L., et al. (2005). Investigation of a 2.5 THz quantum cascade laser as local oscillator. In Proc. 16th Int. Symp. Space Terahertz Technol. (18). Göteborg, Sweden.
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Karpov, A., Miller, D., Stern, J. A., Bumble, B., LeDuc, H. G., & Zmuidzinas, J. (2005). Low noise NbTiN 1.25 THz SIS mixer for Herschel Space Observatory. In Proc. 16th Int. Symp. Space Terahertz Technol. (450). Göteborg, Sweden.
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Loudkov, D., Tong, C. - Y. E., Marrone, D. P., Ryabchun, S., Paine, S. N., & Blundell, R. (2005). Transmission measurements of infrared filters for low-noise terahertz receiver applications. In Proc. 16th Int. Symp. Space Terahertz Technol. (pp. 354–357).
Abstract: Infrared (IR) filters are very important to the efficient operation of cryogenic receivers. Usually, such filters are mounted on the radiation shield of the cryostat to reduce the heat load to the 4 K stage. Insufficient filtering may cause the temperature of the mixing element in a receiver to be excessively warm, leading to degradation in sensitivity. These filters should be effective in blocking the room temperature IR radiation from outside the cryostat, yet should be transparent across the desired signal frequency band. In the Terahertz frequency range, which is close to the infrared, it is difficult to find an inexpensive low- loss material that can provide the required IR blocking capacity. We present transmission measurements, made using a Fourier Transform Spectrometer (FTS), of a number of potential infrared filters between 0.4 and 1.6 THz. The filters tested include the widely-used, Teflon-based, Zitex-A and Zitex-G films, alkali halide based infrared filter, and crystalline quartz coated with Parylene, and polyethylene films.
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