Abstract
Superconducting transition-edge sensors (TESs) have demonstrated high detection efficiency and photon-number-resolving capability, making TESs attractive in quantum information and astrophysics. Aiming to achieve high energy detection efficiency (i.e., the ratio of the detected energy to incident energy), we integrate the TES in an optical cavity, consisting of 16-layer dielectric reflection mirror and 4-layer antireflection coating. The critical temperature was decreased to 260 mK after deposition of antireflection coating from its original 323 mK. The energy detection efficiency was increased by a factor of two, up to 40%, thanks to the enhancement of photon absorption by adding the optical cavity.
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Acknowledgements
The authors would like to thank Dr. M.J. Wang with ASIAA for useful discussions. This work was supported in part by National Key R&D program of China under Grants 2017YFA0304003 and 2018YFA0404701, in part by NSFC under Grants 11673073 and U1831202, in part by CAS under Grants QYZDJ-SSW-SLH043 and GJJSTD20180003, and in part by the CAS Joint Key Lab for Radio Astronomy.
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Geng, Y., Zhang, W., Li, P.Z. et al. Improving Energy Detection Efficiency of Ti-Based Superconducting Transition-Edge Sensors with Optical Cavity. J Low Temp Phys 199, 556–562 (2020). https://doi.org/10.1007/s10909-020-02383-9
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DOI: https://doi.org/10.1007/s10909-020-02383-9