Influence analysis of gap distance between single-mode fiber and transition edge single-photon sensors

P. Z. Li; J. Q. Zhong; Y. Geng; W. Zhang; Z. Wang; S. C. Shi

doi:10.1117/12.2603899

9 September 2021 Influence analysis of gap distance between single-mode fiber and transition edge single-photon sensors

P. Z. Li, J. Q. Zhong, Y. Geng, W. Zhang, Z. Wang, S. C. Shi

Proceedings Volume 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021); 1190906 (2021) https://doi.org/10.1117/12.2603899
Event: Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 2021, Chengdu, China

Abstract

Optical transition-edge sensor (TES) with high quantum efficiency, low dark count rate, and high energy resolution has been used in quantum information and communications. The gap distance between the fiber tip and TES has an influence on the TES performance. Here we measured the interference pattern of our optical TES devices with and without anti-reflection coating and obtain the gap distance. We also obtain the absolute reflectivity of the Ti-TESs by correcting the effect of power splitter and circulator. Our copper block shrinks ~10 μm when cooled from room temperature down to 100 mK. The measured reflectivity is consistent with the simulation taking the dielectric mirror, Ti film and anti-reflection coating into account. In addition, we study the gap distance dependence of the system efficiency, and find that it is in good agreement with the measured reflectivity at 100 mK. These analyses are useful for further improvement of TES packaging.

Citation Download Citation

P. Z. Li, J. Q. Zhong, Y. Geng, W. Zhang, Z. Wang, and S. C. Shi "Influence analysis of gap distance between single-mode fiber and transition edge single-photon sensors", Proc. SPIE 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 1190906 (9 September 2021); https://doi.org/10.1117/12.2603899

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