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Author Kenyon, M.; Day, P. K.; Bradford, C. M.; Bock, J. J.; Leduc, H. G.
Title Background-limited membrane-isolated TES bolometers for far-IR/submillimeter direct-detection spectroscopy Type Journal Article
Year 2006 Publication (up) Nucl. Instr. & Meth. Phys. Res. A Abbreviated Journal
Volume 559 Issue Pages 456-458
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Call Number RPLAB @ s @ TES_NEP_1e_19 Serial 384
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Author Shitov, Sergey V.; Vystavkin, Alexander N.
Title A design analysis of imaging radiometer with antenna-coupled transition-edge sensors Type Journal Article
Year 2006 Publication (up) Nuclear Instruments and Methods in Physics Research A Abbreviated Journal
Volume 559 Issue Pages 503-505
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Call Number RPLAB @ s @ det_imag_radiometer_Shitov Serial 402
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Author Rosfjord, Kristine M.; Yang, Joel K. W.; Dauler, Eric A.; Kerman, Andrew J.; Vikas Anant; Voronov, Boris M.; Gol'tsman, Gregory N.; Berggren, Karl K.
Title Nanowire Single-photon detector with an integrated optical cavity and anti-reflection coating Type Journal Article
Year 2006 Publication (up) Opt. Express Abbreviated Journal Opt. Express
Volume 14 Issue 2 Pages 527-534
Keywords SSPD, SNSPD, cavity
Abstract We have fabricated and tested superconducting single-photon detectors and demonstrated detection efficiencies of 57% at 1550-nm wavelength and 67% at 1064 nm. In addition to the peak detection efficiency, a median detection efficiency of 47.7% was measured over 132 devices at 1550 nm. These measurements were made at 1.8K, with each device biased to 97.5% of its critical current. The high detection efficiencies resulted from the addition of an optical cavity and anti-reflection coating to a nanowire photodetector, creating an integrated nanoelectrophotonic device with enhanced performance relative to the original device. Here, the testing apparatus and the fabrication process are presented. The detection efficiency of devices before and after the addition of optical elements is also reported.
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ISSN 1094-4087 ISBN Medium
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Notes PMID:19503367 Approved no
Call Number Serial 388
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Author Baryshev A.; Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L.
Title Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser Type Journal Article
Year 2006 Publication (up) Physics Letters Abbreviated Journal
Volume 89 Issue Pages
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Abstract We have studied the phase locking and spectral linewidth of an ~ 2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave eference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under requency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ~ 6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.
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Call Number RPLAB @ atomics90 @ Serial 967
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Author Irwin, K.D.
Title Thermodynamics of nonlinear bolometers near equilibrium Type Conference Article
Year 2006 Publication (up) Proc. 11th International Workshop on Low Temp. Detectors Abbreviated Journal Proc. 11th International Workshop on Low Temp. Detectors
Volume 559 Issue 2 Pages 718-720
Keywords bolometers, microcalorimeters, nonlinear thermodynamics, nonequilibrium
Abstract 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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Notes Recommended by Klapwijk Approved no
Call Number Serial 915
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