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Miller, Aaron J.; Lita, Adriana E.; Calkins, Brice; Vayshenker, Igor; Gruber, Steven M.; Nam, Sae Woo |
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Compact cryogenic self-aligning fiber-to-detector coupling with losses below one percent |
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Journal Article |
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2011 |
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Optics Express |
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Opt. Express |
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19 |
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10 |
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9102-9110 |
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TES |
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We present a compact packaging technique for coupling light from a single-mode telecommunication fiber to cryogenic single-photon sensitive devices. Our single-photon detectors are superconducting transition-edge sensors (TESs) with a collection area only a factor of a few larger than the area of the fiber core which presents significant challenges to low-loss fiber-to-detector coupling. The coupling method presented here has low loss, cryogenic compatibility, easy and reproducible assembly and low component cost. The system efficiency of the packaged single-photon counting detectors is verified by the “triplet method†of power-source calibration along with the “multiple attenuator†method that produces a calibrated single-photon flux. These calibration techniques, when used in combination with through-wafer imaging and fiber back-reflection measurements, give us confidence that we have achieved coupling losses below 1 % for all devices packaged according to the self-alignment method presented in this paper. |
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RPLAB @ gujma @ |
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666 |
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Hu, Xiaolong; Dauler, Eric A.; Molnar, Richard J.; Berggren, Karl K. |
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Title |
Superconducting nanowire single-photon detectors integrated with optical nano-antennae |
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Journal Article |
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Year |
2011 |
Publication |
Optics Express |
Abbreviated Journal |
Opt. Express |
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19 |
Issue |
1 |
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17-31 |
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Keywords |
optical antennas |
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Optical nano-antennae have been integrated with semiconductor lasers to intensify light at the nanoscale and photodiodes to enhance photocurrent. In quantum optics, plasmonic metal structures have been used to enhance nonclassical light emission from single quantum dots. Absorption and detection of single photons from free space could also be enhanced by nanometallic antennae, but this has not previously been demonstrated. Here, we use nano-optical transmission effects in a one-dimensional gold structure, combined with optical cavity resonance, to form optical nano-antennae, which are further used to couple single photons from free space into a 80-nm-wide superconducting nanowire. This antenna-assisted coupling enables a superconducting nanowire single-photon detector with 47% device efficiency at the wavelength of 1550 nm and 9-μm-by-9-μm active area while maintaining a reset time of only 5 ns. We demonstrate nanoscale antenna-like structures to achieve exceptional efficiency and speed in single-photon detection. |
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RPLAB @ gujma @ |
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745 |
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