Improvement of infrared single-photon detectors absorptance by integrated plasmonic structures

M. Csete, Áron Sipos, Anikó Szalai, Faraz Najafi, Gábor Szabó, Karl K. Berggren

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Plasmonic structures open novel avenues in photodetector development. Optimized illumination configurations are reported to improve p-polarized light absorptance in superconducting-nanowire single-photon detectors (SNSPDs) comprising short- and long-periodic niobium-nitride (NbN) stripe-patterns. In OC-SNSPDs consisting of ∼quarter-wavelength dielectric layer closed by a gold reflector the highest absorptance is attainable at perpendicular incidence onto NbN patterns in P-orientation due to E-field concentration at the bottom of nano-cavities. In NCAI-SNSPDs integrated with nano-cavity-arrays consisting of vertical and horizontal gold segments off-axis illumination in S-orientation results in polar-angle-independent perfect absorptance via collective resonances in short-periodic design, while in long-periodic NCAI-SNSPDs grating-coupled surface waves promote EM-field transportation to the NbN stripes and result in local absorptance maxima. In NCDAI-SNSPDs integrated with nano-cavity-deflector- array consisting of longer vertical gold segments large absorptance maxima appear in 3p-periodic designs due to E-field enhancement via grating-coupled surface waves synchronized with the NbN stripes in S-orientation, which enable to compensate fill-factor-related retrogression.

Original languageEnglish
Article number2406
JournalScientific Reports
Volume3
DOIs
Publication statusPublished - 2013

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Nanowires
Niobium
Photons
Gold
Lighting
Light
Incidence

ASJC Scopus subject areas

  • General
  • Medicine(all)

Cite this

Improvement of infrared single-photon detectors absorptance by integrated plasmonic structures. / Csete, M.; Sipos, Áron; Szalai, Anikó; Najafi, Faraz; Szabó, Gábor; Berggren, Karl K.

In: Scientific Reports, Vol. 3, 2406, 2013.

Research output: Contribution to journalArticle

Csete, M. ; Sipos, Áron ; Szalai, Anikó ; Najafi, Faraz ; Szabó, Gábor ; Berggren, Karl K. / Improvement of infrared single-photon detectors absorptance by integrated plasmonic structures. In: Scientific Reports. 2013 ; Vol. 3.
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