Enhancing Detection Efficiency by Applying an Optical Cavity Structure in a Superconducting Nanowire Single-Photon Detector
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概要
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We report on the enhancement of system detection efficiency in a superconducting nanowire single-photon detector (SNSPD) by applying the optical cavity structure. The nanowire was made using 4-nm-thick NbN thin films and covered with an SiO cavity and Au mirror designed for 1300-1600nm wavelengths. The device is mounted into fiber-coupled packages, and installed in a practical multichannel system based on GM cryocoolers. System detection efficiency depends on the absorptance of cavity structure, and reached 28% and 40% at 1550nm and 1310nm wavelengths, respectively. These values were considerably higher than an SNSPD without optical cavity.
- 2011-03-01
著者
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Wang Zhen
National Inst. Information And Communications Technol. Kobe Jpn
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Fujiwara Mikio
National Inst. Information And Communications Technol. Tokyo Jpn
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Fujiwara Mikio
National Institute Of Information And Communications Technology
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SASAKI Masahide
National Institute of Information and Communications Technology
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Miki Shigehito
National Inst. Information And Communications Technol. Kobe Jpn
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Miki Shigehito
Kansai Advanced Research Center National Institute Of Information And Communications Technology
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Sasaki Masahide
National Inst. Information And Communications Technol. (nict) Tokyo Jpn
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Yamashita Taro
Kobe Advanced Ict Research Center National Institute Of Information And Communications Technology
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YAMASHITA Taro
National Institute of Information and Communication Technology
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Miki Shigehito
National Institute Of Information And Communication Technology
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Yamashita Taro
National Institute Of Information And Communications Technology Kobe Advanced Research Center
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Wang Zhen
National Institute Of Information And Communications Technology Kobe Advanced Research Center
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