Numerical method to optimize the polar-azimuthal orientation of infrared superconducting-nanowire single-photon detectors

M. Csete, Áron Sipos, Faraz Najafi, Xiaolong Hu, Karl K. Berggren

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A finite-element method for calculating the illumination-dependence of absorption in three-dimensional nanostructures is presented based on the radio frequency module of the Comsol Multiphysics software package (Comsol AB). This method is capable of numerically determining the optical response and near-field distribution of subwavelength periodic structures as a function of illumination orientations specified by polar angle, φ, and azimuthal angle, γ. The method was applied to determine the illuminationangle-dependent absorptanceincavity-based superconducting-nanowire single-photon detector (SNSPD) designs. Niobium-nitride stripes based on dimensions of conventional SNSPDs and integrated with ∼ quarter-wavelength hydrogen-silsesquioxane- filled nano-optical cavity and covered byathin gold film acting asareflector were illuminated from belowbyp-polarized lightinthis study. The numerical results were compared to results from complementary transfer-matrix-method calculations on composite layers made of analogous film-stacks. This comparison helped to uncover the optical phenomena contributing to the appearance of extrema in the optical response. This paper presentsan approachtooptimizing the absorptance of different sensing and detecting devices via simultaneous numerical optimization of the polar and azimuthal illumination angles.

Original languageEnglish
Pages (from-to)5949-5956
Number of pages8
JournalApplied Optics
Volume50
Issue number31
DOIs
Publication statusPublished - Nov 1 2011

Fingerprint

Nanowires
Numerical methods
nanowires
Photons
Lighting
illumination
Infrared radiation
Detectors
detectors
photons
absorptance
Transfer matrix method
Periodic structures
range (extremes)
Niobium
Software packages
niobium
Nitrides
matrix methods
nitrides

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Numerical method to optimize the polar-azimuthal orientation of infrared superconducting-nanowire single-photon detectors. / Csete, M.; Sipos, Áron; Najafi, Faraz; Hu, Xiaolong; Berggren, Karl K.

In: Applied Optics, Vol. 50, No. 31, 01.11.2011, p. 5949-5956.

Research output: Contribution to journalArticle

Csete, M. ; Sipos, Áron ; Najafi, Faraz ; Hu, Xiaolong ; Berggren, Karl K. / Numerical method to optimize the polar-azimuthal orientation of infrared superconducting-nanowire single-photon detectors. In: Applied Optics. 2011 ; Vol. 50, No. 31. pp. 5949-5956.
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