Nanoantenna enhancement for telecom-wavelength superconducting single photon detectors

Heath, Robert M.; Tanner, Michael G.; Drysdale, Timothy D.; Miki, Shigehito; Giannini, Vincenzo; Maier, Stefan A. and Hadfield, Robert H. (2015). Nanoantenna enhancement for telecom-wavelength superconducting single photon detectors. Nano Letters, 15(2) pp. 819–822.

DOI: https://doi.org/10.1021/nl503055a

Abstract

Superconducting nanowire single photon detectors are rapidly emerging as a key infrared photon-counting technology. Two front-side-coupled silver dipole nanoantennas, simulated to have resonances at 1480 and 1525 nm, were fabricated in a two-step process. An enhancement of 50 to 130% in the system detection efficiency was observed when illuminating the antennas. This offers a pathway to increasing absorption into superconducting nanowires, creating larger active areas, and achieving more efficient detection at longer wavelengths.

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