The performance of superconducting-nanowire single-photon detectors depends on the efficiency of light absorption in the ultrathin (3-8 nm) superconducting nanowire. In this work, we will discuss two approaches to boost light absorption: coupling the nanowire to the evanescent field propagating in a waveguide and enclosing the nanowire in an optical cavity. The latter method is the most widely used, but it is intrinsically very sensitive to the polarization of light. To overcome this issue, we propose some innovative cavity designs which make use of high-index (n >2) dielectrics. With this technique, highly-efficient polarization-insensitive devices can be easily implemented.
Luca Redaelli, Gabriele Bulgarini, Sergiy Dobrovolskiy, Sander Dorenbos, Anna Mukhtarova, Val Zwiller, Eva Monroy, and Jean-Michel Gérard, "High absorption efficiency and polarization-insensitivity in superconducting-nanowire single-photon detectors," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101112K (Presented at SPIE OPTO: February 02, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2252332.
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