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Prober, D. E. |
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Superconducting terahertz mixer using a transition-edge microbolometer |
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1993 |
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Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520-2157 |
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2119-2121 |
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We present a new device concept for a mixer element for THz frequencies. This uses a superconducting transition-edge microbridge biased at the center of its superconducting transition near 4.2 K. It is fed from an antenna or waveguide structure. Power from a local oscillator and a rf signal produce a temperature and resulting resistance variation at the difference frequency. The new aspect is the use of a very short bridge in which rapid ( < 0.1 ns) outdiffision of hot electrons occurs. This gives large intermediate frequency (if) response. The mixer offers ~4 GHz if bandwidth, z 80 Cl rf resistive impedance, good match to the if amplifier, and requires only l-20 nW of local oscillator power. The upper rf frequency is determined by antenna or waveguide properties. Predicted mixer conversion efficiency is l/8, and predicted double-sideband receiver noise temperatures are 260 and 90 K for transition widths of 0.1 and 0.5 T, respectively. |
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RPLAB @ atomics90 @ |
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955 |
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Gershenson, M. E.; Gong, D.; Sato, T.; Karasik, B. S.; Sergeev, A. V. |
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Millisecond electron-phonon relaxation in ultrathin disordered metal films at millikelvin temperatures |
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2001 |
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Appl. Phys. Lett. |
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79 |
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2049-2051 |
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HEB detector, FIR, far infrared |
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RPLAB @ s @ heb_eph_interaction_Gershenzon |
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315 |
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Marsili, Francesco; Najafi, Faraz; Dauler, Eric; Bellei, Francesco; Hu, Xiaolong; Csete, Maria; Molnar, Richard J.; Berggren, Karl K. |
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Single-photon detectors based on ultranarrow superconducting nanowires |
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2011 |
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Nano Letters |
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Nano Lett. |
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11 |
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5 |
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2048–2053 |
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SNSPD |
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We report efficient single-photon detection (η = 20% at 1550 nm wavelength) with ultranarrow (20 and 30 nm wide) superconducting nanowires, which were shown to be more robust to constrictions and more responsive to 1550 nm wavelength photons than standard superconducting nanowire single-photon detectors, based on 90 nm wide nanowires. We also improved our understanding of the physics of superconducting nanowire avalanche photodetectors, which we used to increase the signal-to-noise ratio of ultranarrow-nanowire detectors by a factor of 4, thus relaxing the requirements on the read-out circuitry and making the devices suitable for a broader range of applications. |
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RPLAB @ gujma @ |
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659 |
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Shah, Jagdeep; Pinczuk, A.; Gossard, A. C.; Wiegmann, W. |
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Energy-loss rates for hot electrons and holes in GaAs quantum wells |
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1985 |
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Phys. Rev. Lett. |
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Phys. Rev. Lett. |
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54 |
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2045-2048 |
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2DEG, GaAs/AlGaAs, heat flow, electron-phonon, hole-phonon, carrier-phonon, interactions |
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We report the first direct determination of carrier-energy-loss rates in a semiconductor. These measurements provide fundamental insight into carrier-phonon interactions in semiconductors. Unexpectedly large differences are found in the energy-loss rates for electrons and holes in GaAs/AlGaAs quantum wells. This large difference results from an anomalously low electron-energy-loss rate, which we attribute to the presence of nonequilibrium optical phonons rather than the effects of reduced dimensionality or dynamic screening. |
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633 |
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Dickert, Franz L. |
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Christoph A. Schalley (Ed.): Analytical methods in supramolecular chemistry |
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2007 |
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Analytical and Bioanalytical Chemistry |
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Anal Bioanal Chem |
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389 |
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7-8 |
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2039-2040 |
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supramolecular recognition |
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This is a review of book. |
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1618-2642 |
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