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Yates, S. J. C.; Baryshev, A. M.; Baselmans, J. J. A.; Klein, B.; Güsten, R. |
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Fast Fourier transform spectrometer readout for large arrays of microwave kinetic inductance detectors |
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2009 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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95 |
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4 |
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3 |
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Microwave kinetic inductance detectors have great potential for large, very sensitive detector arrays for use in, for example, submillimeter imaging. Being intrinsically readout in the frequency domain, they are particularly suited for frequency domain multiplexing allowing ~1000 s of devices to be readout with one pair of coaxial cables. However, this moves the complexity of the detector from the cryogenics to the warm electronics. We present here the concept and experimental demonstration of the use of fast Fourier transform spectrometer readout, showing no deterioration of the noise performance compared to the low noise analog mixing while allowing high multiplexing ratios. |
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RPLAB @ gujma @ |
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697 |
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Minaeva, Olga; Bonato, Cristian; Saleh, Bahaa E. A.; Simon, David S.; Sergienko, Alexander V. |
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Odd- and even-order dispersion cancellation in quantum interferometry |
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2009 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
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102 |
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10 |
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4 |
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We describe a novel effect involving odd-order dispersion cancellation. We demonstrate that odd- and even-order dispersion cancellation may be obtained in different regions of a single quantum interferogram using frequency-anticorrelated entangled photons and a new type of quantum interferometer. This offers new opportunities for quantum communication and metrology in dispersive media. |
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699 |
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Ожегов, Р. В.; Окунев, О. В.; Гольцман, Г. Н.; Филиппенко, Л. В.; Кошелец, В. П. |
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Флуктуационная чувствительность сверхпроводящего интегрального приемника терагерцового диапазона частот |
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Journal Article |
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2009 |
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Радиотехника и электроника |
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Радиотех. электроник. |
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54 |
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6 |
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750-755 |
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Исследована зависимость флуктуационной чувствительности сверхпроводящего интегрального приемника (СИП) от шумовой температуры приемника и величины входного сигнала. Измерена рекордная флуктуационная чувствительность приемника (13 ± 2 мК), полученная при шумовой температуре приемника 200 К, ширине полосы промежуточных частот 4 ГГц и постоянной времени 1 с. При уменьшении входного сигнала наблюдалось улучшение флуктуационной чувствительности; предложено обÑŠяснение полученного эффекта: причиной является уменьшение влияния нестабильностей источников питания приемника и усилительного тракта при снижении входного сигнала. |
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RPLAB @ gujma @ |
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710 |
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Смирнов, Андрей Владимирович |
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Исследование полосы преобразования терагерцовых смесителей на эффекте электронного разогрева в NbZr, NbN и в одиночном гетеропереходе AlGaAs/GaAs |
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2009 |
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Радиофизика |
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Радиофиз. |
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139 |
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Диссертация |
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RPLAB @ gujma @ |
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718 |
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Lobanov, Y.; Tong, C.; Blundell, R.; Gol'tsman, G. |
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A study of direct detection effect on the linearity of hot electron bolometer mixers |
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Conference Article |
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2009 |
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Proc. 20th Int. Symp. Space Terahertz Technol. |
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Proc. 20th ISSTT |
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282-287 |
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HEB mixer, direct detection effect |
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We have performed a study of how direct detection affects the linearity and hence the calibration of an HEB mixer. Two types of waveguide HEB devices have been used: a 0.8 THz HEB mixer and a 1.0 THz HEB mixer which is ~5 times smaller than the former. Two independent experimental approaches were used. In the ΔG/G method, the conversion gain of the HEB mixer is first measured as a function of the bias current for a number of bias voltages. At each bias setting, we carefully measure the change in the operating current when the input loads are switched. From the measured data, we can derive the expected difference in gain between the hot and cold loads. In the second method (injection method [1]), the linearity of the HEB mixer is independently measured by injecting a modulated signal for different input load temperatures. The results of both approaches confirm that there is gain compression in the operation of HEB mixers. Based on the results of our measurements, we discuss the impact of direct detection effects on the operation of HEB mixers. |
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RPLAB @ gujma @ |
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724 |
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