Plasmonic Structure Integrated Single-Photon Detector Configurations to Improve Absorptance and Polarization Contrast

Sensors

Mária Csete¹  Gปor Szekeres¹  András Szenes¹  Anikó Szalai¹ 

[1] Department of Optics and Quantum Electronics, University of Szeged, H-6720 Szeged, Dóm tér 9 6720, Hungary; E-Mails:

关键词: photodetectors;    sub-wavelength structures;    surface plasmon polaritons;    surface waves;    plasmonics;   

DOI  :  10.3390/s150203513

来源: mdpi

【 摘 要 】

Configurations capable of maximizing both the absorption component of system detection efficiency and the achievable polarization contrast were determined for 1550 nm polarized light illumination of different plasmonic structure integrated superconducting nanowire single-photon detectors (SNSPDs) consisting of p = 264 nm and P = 792 nm periodic niobium nitride (NbN) patterns on silica substrate. Global effective NbN absorptance maxima appear in case of p/s-polarized light illumination in S/P-orientation (γ = 90°/0° azimuthal angle) and the highest polarization contrast is attained in S-orientation of all devices. Common nanophotonical origin of absorptance enhancement is collective resonance on nanocavity gratings with different profiles, which is promoted by coupling between localized modes in quarter-wavelength metal-insulator-metal nanocavities and laterally synchronized Brewster-Zenneck-type surface waves in integrated SNSPDs possessing a three-quarter-wavelength-scaled periodicity. The spectral sensitivity and dispersion characteristics reveal that device design specific optimal configurations exist.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.