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Shitov, Sergey V.; Vystavkin, Alexander N. |
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A design analysis of imaging radiometer with antenna-coupled transition-edge sensors |
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2006 |
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Nuclear Instruments and Methods in Physics Research A |
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559 |
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503-505 |
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RPLAB @ s @ det_imag_radiometer_Shitov |
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402 |
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Irwin, K.D. |
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Title |
Thermodynamics of nonlinear bolometers near equilibrium |
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Conference Article |
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2006 |
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Proc. 11th International Workshop on Low Temp. Detectors |
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Proc. 11th International Workshop on Low Temp. Detectors |
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559 |
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2 |
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718-720 |
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bolometers, microcalorimeters, nonlinear thermodynamics, nonequilibrium |
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We present the first thermodynamically correct calculation of the noise in a simple nonlinear resistive bolometer or calorimeter operated out of equilibrium. The solution is rigorous only for first- and second-order deviations from equilibrium, and for the linear and quadratic terms of dissipative elements. In contrast, existing models of noise in resistive bolometers are based on the application of equilibrium theories to a system that is often nonlinear and out of equilibrium. We derive solutions applicable both in and out of steady state. The noise has power spectral density different from the equilibrium theory, and it has higher-order correlations and non-Gaussian characteristics. The results do not apply to non-Markovian hidden variables in the bolometer. |
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Recommended by Klapwijk |
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915 |
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Gol'tsman, G.; Maslennikov, S.; Finkel, M.; Antipov, S.; Kaurova, N.; Grishina, E.; Polyakov, S.; Vachtomin, Y.; Svechnikov, S.; Smirnov, K.; Voronov, B. |
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Nanostructured ultrathin NbN film as a terahertz hot-electron bolometer mixer |
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Conference Article |
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2006 |
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Proc. MRS |
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Proc. MRS |
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935 |
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210 (1 to 6) |
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NbN HEB mixers |
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Planar spiral antenna coupled and directly lens coupled NbN HEB mixer structures are studied. An additional MgO buffer layer between the superconducting film and Si substrate is introduced. The buffer layer enables us to increase the gain bandwidth of a HEB mixer due to better acoustic transparency. The gain bandwidth is widened as NbN film thickness decreases and amounts to 5.2 GHz. The noise temperature of antenna coupled mixer is 1300 and 3100 K at 2.5 and 3.8 THz respectively. The structure and composition of NbN films is investigated by X-ray diffraction spectroscopy methods. Noise performance degradation at LO frequencies more than 3 THz is due to the use of a planar antenna and signal loss in contacts between the antenna and the sensitive NbN bridge. The mixer is reconfigured for operation at higher frequencies in a manner that receiver’s noise temperature is only 2300 K (3 times of quantum limit) at LO frequency of 30 THz. |
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0272-9172 |
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1440 |
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Piotr슠Orleanski; Miroslaw슠Ciechanowicz; Malgorzata슠Michalska; Witold슠Nowosielski; Miroslaw슠Rataj; Marek슠Winkler |
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LCU: the control unit dedicated for local oscillator subsystem in ESA HIFI/Herschel project |
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2006 |
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Proc. SPIE |
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6159 |
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RPLAB @ s @ LO_control_HIFI_Heschel_2006 |
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391 |
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David Olaya; Jian Wei; Sergei Pereverzev; Karasik, Boris S.; Kawamura, Jonat.han H.; McGrath, William R.; Sergeyev, Andrei V.; Gershenson, Michael E. |
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An ultrasensitive hot-electron bolometer for low-background SMM applications |
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2006 |
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Proc. SPIE |
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6275 |
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627506 |
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RPLAB @ s @ qoheb_det_SPIE_Olaya_2006 |
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387 |
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