Superconducting nanowire single-photon detector

Abstract

The invention discloses a superconducting nanowire single-photon detector. The detector comprises a bent fractal nanowire structure and an optical cavity structure; the bent fractal nanowire structureis used for relieving the current crowding effect and achieving the effect that the detection efficiency is insensitive to the polarization state of incident photons, and the bent fractal nanowire structure comprises parallel bent fractal nanowires and series bent fractal nanowires; and the optical cavity structure is used for realizing simultaneous optimization of internal quantum efficiency andabsorption efficiency. The detector can be widely applied to the fields of optical communication, single-photon imaging, fluorescence detection, quantum optics and the like, and the development and progress of the fields can be remarkably promoted due to the excellent performance of the detector.

Description

technical field

[0001] The invention relates to the field of optoelectronic devices, in particular to a superconducting nanowire single photon detector. Background technique

[0002] Superconducting nanowire single photon detectors (SNSPDs) have developed rapidly in recent years, and their performance indicators have been continuously pushed to new heights. The Sae Woo Nam team of the National Institute of Standards and Technology in the United States achieved a detection efficiency of 98% in the 1550 nm band using molybdenum silicide superconducting materials in 2019 [Conference on Coherence and Quantum Optics, 2019, pp.W2B-2.]; in In 2017, Val Zwiller’s team at Delft University in the Netherlands achieved a detection efficiency of 92% in the 1310 nm band using titanium niobium nitride superconducting materials [APL Photonics,2017,2(11):111301.], Shanghai Microsystems, China Suo Youlixing's team achieved a detection efficiency of 98% in the 1590 nm band using niobium nitri...

Images