This article is cited in 5 papers

Improving the efficiency of the integrated optical superconducting single photon detector on a lithium niobate substrate by means of an additional cover layer with a high refractive index

M. V. Parfenov^ab, A. V. Shamray<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b Peter the Great St. Petersburg Polytechnic University

Abstract: A mechanism of amplification of interaction between optical radiation and superconducting niobium nitride thin film placed on the surface of optical waveguides, which are fabricated on lithium niobate substrate, is investigated. This effect can be obtained with help of an additional covering layer with high refractive index. It was shown that adiabatic deformation of waveguide modes can increase absorption of light in a superconducting layer up to $\sim$1 dB/$\mu$m, making it possible to fabricate a SSPD on lithium niobate with quantum efficiency of about 70%.

Keywords: single photon detector, optical waveguide, lithium niobate, optical mode, integrated optics, quantum photonics.

Received: 17.04.2020
Revised: 17.04.2020
Accepted: 18.05.2020

DOI: 10.21883/PJTF.2020.16.49853.18344

 English version: Technical Physics Letters, 2020, 46:8, 819–822

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