Koshelets VP, Dmitriev PN, Ermakov AB, Filippenko LV, Koryukin OV, Torgashin MY, et al. Integrated superconducting spectrometer for atmosphere monitoring. Radiophys. Quant. Electron.. 2005;48(10-11):844–50.
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Tol J van, Brunel L-C, Wylde RJ. A quasioptical transient electron spin resonance spectrometer operating at 120 and 240 GHz. Rev Sci Instrum. 2005;76(7):074101 (1 to 8).
Abstract: A new multifrequency quasioptical electron paramagnetic resonance (EPR) spectrometer is described. The superheterodyne design with Schottky diode mixer/detectors enables fast detection with subnanosecond time resolution. Optical access makes it suitable for transient EPR (TR-EPR) at 120 and 240 GHz. These high frequencies allow for an accurate determination of small g-tensor anisotropies as are encountered in excited triplet states of organic molecules like porphyrins and fullerenes. The measured concentration sensitivity for continuous-wave (cw) EPR at 240 GHz and at room temperature without cavity is 1013 spins/cm3 (15 nM) for a 1 mT linewidth and a 1 Hz bandwidth. With a Fabry-Perot cavity and a sample volume of 30 nl, the sensitivity at 240 GHz corresponds to [approximate]3×109 spins for a 1 mT linewidth. The spectrometer's performance is illustrated with applications of transient EPR of excited triplet states of organic molecules, as well as cw EPR of nitroxide reference systems and a thin film of a colossal magnetoresistance material.
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Тарасов М, Кузьмин Л. Концепция смесителя на основе болометра на холодных электронах. Письма в ЖЭТФ. 2005;81(10):661–4.
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Baselmans JJA, Baryshev A, Reker SF, Hajenius M, Gao JR, Klapwijk TM, et al. Direct detection effect in small volume hot electron bolometer mixers. Appl Phys Lett. 2005;86(16):163503 (1 to 3).
Abstract: We measure the direct detection effect in a small volume (0.15μm×1μm×3.5nm)(0.15μm×1μm×3.5nm) quasioptical NbN phonon cooled hot electronbolometermixer at 1.6THz1.6THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300K300K and 77K77K. Using a 200GHz200GHzbandpass filter at 4.2K4.2K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems.
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An Z, Chen J-C, Ueda T, Komiyama S, Hirakawa K. Infrared phototransistor using capacitively coupled two-dimensional electron gas layers. Appl Phys Lett. 2005;86:172106-3.
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