Improvement of infrared single-photon detectors absorptance by integrated plasmonic structures
Author(s)Najafi, Faraz; Berggren, Karl K.; Csete, Maria; Sipos, Aron; Szalai, Aniko; Szabo, Gabor; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Nature Publishing Group
Csete, Mária, Áron Sipos, Anikó Szalai, Faraz Najafi, Gábor Szabó, and Karl K. Berggren. “Improvement of Infrared Single-Photon Detectors Absorptance by Integrated Plasmonic Structures.” Sci. Rep. 3 (August 12, 2013).
Final published version