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Floet D. W.; Gao J. R.; Klapwijk T. M.; de Korte P. A. J. |
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Bias Dependence of the Thermal Time Constant in Nb Superconducting Diffusion-Cooled HEB Mixers |
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2000 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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77 |
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1719 |
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We present an experimental study of the intermediate frequency bandwidth of a Nb diffusion-cooled hot-electron bolometer mixer for different bias voltages. The measurements show that the bandwidth increases with increasing voltage. Analysis of the data reveals that this effect is mainly caused by a decrease of the intrinsic thermal time of the mixer and that the effect of electrothermal feedback through the intermediate frequency circuit is small. The results are understood using a qualitative model, which takes into account the different effective diffusion constants in the normal and superconducting domains. |
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RPLAB @ atomics90 @ |
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971 |
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Ganzevles, W. F. M.; Gao, J. R.; de Korte, P. A. J.; Klapwijk, T. M. |
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Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers |
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2001 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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79 |
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15 |
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2483-2485 |
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0003-6951 |
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311 |
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Zwiller, Vale<cc><81>ry; Blom, Hans; Jonsson, Per; Panev, Nikolay; Jeppesen, Sören; Tsegaye, Tedros; Goobar, Edgard; Pistol, Mats-Erik; Samuelson, Lars; Björk, Gunnar |
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Single quantum dots emit single photons at a time: Antibunching experiments |
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2001 |
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Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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78 |
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17 |
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2476 |
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antibunching, quantum dot |
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502 |
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Gol’tsman, G. N.; Okunev, O.; Chulkova, G.; Lipatov, A.; Semenov, A.; Smirnov, K.; Voronov, B.; Dzardanov, A.; Williams, C.; Sobolewski, R. |
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Picosecond superconducting single-photon optical detector |
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2001 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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79 |
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6 |
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705-707 |
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NbN SSPD, SNSPD |
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We experimentally demonstrate a supercurrent-assisted, hotspot-formation mechanism for ultrafast detection and counting of visible and infrared photons. A photon-induced hotspot leads to a temporary formation of a resistive barrier across the superconducting sensor strip and results in an easily measurable voltage pulse. Subsequent hotspot healing in ∼30 ps time frame, restores the superconductivity (zero-voltage state), and the detector is ready to register another photon. Our device consists of an ultrathin, very narrow NbN strip, maintained at 4.2 K and current-biased close to the critical current. It exhibits an experimentally measured quantum efficiency of ∼20% for 0.81 μm wavelength photons and negligible dark counts. |
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1543 |
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Zwiller, V.; Aichele, T.; Seifert, W.; Persson, J.; Benson, O. |
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Generating visible single photons on demand with single InP quantum dots |
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2003 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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82 |
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10 |
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1509-1511 |
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single photon, quantum dot, InP |
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0003-6951 |
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