A tunable fiber-coupled optical cavity for agile enhancement of detector absorption

Robert M. Heath, Michael George Tanner, Robert Andrew Kirkwood, Shigehito Miki, Richard J Warburton

Research output: Contribution to journalArticle

Abstract

Maximizing photon absorption into thin active structures can be the limiting factor for photodetector efficiency. In this work, a fiber-coupled tunable cavity is demonstrated, designed to achieve close to unity absorption of photons into a thin film superconducting nanowire single photon detector (SNSPD). A technique for defining a stable cavity between the end of a telecommunications optical fiber and a reflective substrate is described and realized. Cavity resonances are demonstrated both through the tuning of input wavelength and cavity length. The resulting optical cavity can tune the resonant absorption in situ over a wavelength range of 100 nm. This technique is used to maximize the single photon absorption into both a back-side-coupled Au mirror SNSPD and a front-side-coupled distributed Bragg reflector cavity SNSPD. The system detection efficiency (SDE) is limited by imperfections in the thin films, but in both cases we demonstrate an improvement of the SDE by 40% over bare fiber illumination.

Original languageEnglish
Article number113101
JournalJournal of Applied Physics
Volume120
Issue number11
Early online date15 Sep 2016
DOIs
Publication statusPublished - 21 Sep 2016

Fingerprint

cavities
fibers
augmentation
detectors
photons
nanowires
Bragg reflectors
thin films
wavelengths
photometers
telecommunication
unity
optical fibers
illumination
tuning
mirrors
defects

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Heath, Robert M. ; Tanner, Michael George ; Kirkwood, Robert Andrew ; Miki, Shigehito ; Warburton, Richard J. / A tunable fiber-coupled optical cavity for agile enhancement of detector absorption. In: Journal of Applied Physics. 2016 ; Vol. 120, No. 11.
@article{13380f127e9d40c79db57016c48f3967,
title = "A tunable fiber-coupled optical cavity for agile enhancement of detector absorption",
abstract = "Maximizing photon absorption into thin active structures can be the limiting factor for photodetector efficiency. In this work, a fiber-coupled tunable cavity is demonstrated, designed to achieve close to unity absorption of photons into a thin film superconducting nanowire single photon detector (SNSPD). A technique for defining a stable cavity between the end of a telecommunications optical fiber and a reflective substrate is described and realized. Cavity resonances are demonstrated both through the tuning of input wavelength and cavity length. The resulting optical cavity can tune the resonant absorption in situ over a wavelength range of 100 nm. This technique is used to maximize the single photon absorption into both a back-side-coupled Au mirror SNSPD and a front-side-coupled distributed Bragg reflector cavity SNSPD. The system detection efficiency (SDE) is limited by imperfections in the thin films, but in both cases we demonstrate an improvement of the SDE by 40{\%} over bare fiber illumination.",
author = "Heath, {Robert M.} and Tanner, {Michael George} and Kirkwood, {Robert Andrew} and Shigehito Miki and Warburton, {Richard J}",
year = "2016",
month = "9",
day = "21",
doi = "10.1063/1.4962456",
language = "English",
volume = "120",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "11",

}

A tunable fiber-coupled optical cavity for agile enhancement of detector absorption. / Heath, Robert M.; Tanner, Michael George; Kirkwood, Robert Andrew; Miki, Shigehito; Warburton, Richard J.

In: Journal of Applied Physics, Vol. 120, No. 11, 113101, 21.09.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A tunable fiber-coupled optical cavity for agile enhancement of detector absorption

AU - Heath, Robert M.

AU - Tanner, Michael George

AU - Kirkwood, Robert Andrew

AU - Miki, Shigehito

AU - Warburton, Richard J

PY - 2016/9/21

Y1 - 2016/9/21

N2 - Maximizing photon absorption into thin active structures can be the limiting factor for photodetector efficiency. In this work, a fiber-coupled tunable cavity is demonstrated, designed to achieve close to unity absorption of photons into a thin film superconducting nanowire single photon detector (SNSPD). A technique for defining a stable cavity between the end of a telecommunications optical fiber and a reflective substrate is described and realized. Cavity resonances are demonstrated both through the tuning of input wavelength and cavity length. The resulting optical cavity can tune the resonant absorption in situ over a wavelength range of 100 nm. This technique is used to maximize the single photon absorption into both a back-side-coupled Au mirror SNSPD and a front-side-coupled distributed Bragg reflector cavity SNSPD. The system detection efficiency (SDE) is limited by imperfections in the thin films, but in both cases we demonstrate an improvement of the SDE by 40% over bare fiber illumination.

AB - Maximizing photon absorption into thin active structures can be the limiting factor for photodetector efficiency. In this work, a fiber-coupled tunable cavity is demonstrated, designed to achieve close to unity absorption of photons into a thin film superconducting nanowire single photon detector (SNSPD). A technique for defining a stable cavity between the end of a telecommunications optical fiber and a reflective substrate is described and realized. Cavity resonances are demonstrated both through the tuning of input wavelength and cavity length. The resulting optical cavity can tune the resonant absorption in situ over a wavelength range of 100 nm. This technique is used to maximize the single photon absorption into both a back-side-coupled Au mirror SNSPD and a front-side-coupled distributed Bragg reflector cavity SNSPD. The system detection efficiency (SDE) is limited by imperfections in the thin films, but in both cases we demonstrate an improvement of the SDE by 40% over bare fiber illumination.

UR - http://www.scopus.com/inward/record.url?scp=84988424197&partnerID=8YFLogxK

U2 - 10.1063/1.4962456

DO - 10.1063/1.4962456

M3 - Article

VL - 120

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 11

M1 - 113101

ER -