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Enhancing intrinsic detection efficiency of superconducting nanowire single-photon detectors via helium ion irradiation

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arxiv 1807.03438 v1 pith:NVNVKQDU submitted 2018-07-10 physics.app-ph

Enhancing intrinsic detection efficiency of superconducting nanowire single-photon detectors via helium ion irradiation

Weijun Zhang , Qi Jia , Lixing You , Xin Ou , Hao Li , Lu Zhang , Zhen Wang , Xiaoming Xie This is my paper
classification physics.app-ph
keywords detectionefficiencysuperconductingenhancementheliumintrinsicirradiatedirradiation
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Realizing an NbN superconducting nanowire single-photon detector (SNSPD) with a 100% intrinsic detection efficiency (IDE) at the near-infrared wavelengths is still challenging. Herein, we developed a post-processing method to increase the IDE of NbN SNSPDs to near unity using a 20 keV helium ion irradiation. The IDE enhancement was achieved owing to the ion-induced reduction of the superconducting energy gap and the electron density of states at the Fermi level, determined with the electrical and magnetic transport measurements. The change in optical absorptance of the irradiated SNSPD was negligible as confirmed by the measured optical reflectance and system detection efficiency (SDE). Benefited with the IDE enhancement, the SDE of an irradiated device was significantly increased from 49% to 92% at 2.2 K for a 1550 nm wavelength.

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  1. Sputtered NbN Films for Ultrahigh Performance Superconducting Nanowire Single-Photon Detectors

    cond-mat.supr-con 2023-11 unverdicted novelty 4.0

    Ultrathin NbN films with critical temperature near 9 K and sheet resistance of 400 Ω/sq enable ultrahigh performance superconducting nanowire single-photon detectors.