Constriction-limited detection efficiency of superconducting nanowire single-photon detectors

被引：164

作者：

Kerman, Andrew J. ^{[1
]}

Dauler, Eric A.

Yang, Joel K. W.

Rosfjord, Kristine M.

Anant, Vikas

Berggren, Karl K.

Gol'tsman, Gregory N.

Voronov, Boris M.

机构：

[1] MIT, Lincoln Lab, Lexington, MA 02420 USA

[2] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[3] Moscow State Pedag Univ, Moscow 119345, Russia

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 10期

关键词：

Number:; FA8721-05-C-0002; Acronym:; USAF; Sponsor: U.S. Air Force;

D O I：

10.1063/1.2696926

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the source of the large variations in the observed detection efficiencies of superconducting nanowire single-photon detectors between many nominally identical devices. Through both electrical and optical measurements, we infer that these variations arise from "constrictions:" highly localized regions of the nanowires where the effective cross-sectional area for superconducting current is reduced. These constrictions limit the bias-current density to well below its critical value over the remainder of the wire, and thus prevent the detection efficiency from reaching the high values that occur in these devices when they are biased near the critical current density. (c) 2007 American Institute of Physics.

引用

页数：3

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