Enhanced telecom wavelength single-photon detection with NbTiN superconducting nanowires on oxidized silicon

Tanner, M. G.; Natarajan, C. M.; Pottapenjara, V. K.; O’Connor, J. A.; Warburton, R. J.; Hadfield, R. H.; Baek, B.; Nam, S.; Dorenbos, S. N.; Ureña, E. Bermúdez; Zijlstra, T.; Klapwijk, T. M.; Zwiller, V.

doi:doi:10.1063/1.3428960

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Optical chirality of bacteriorhodopsin films via second harmonic Maker’s fringes measurements

We experimentally investigated second harmonic generation from an oriented multilayer film of bacteriorhodopsin protein, deposited onto a charged surface. The generated signal is obtained as a function of incidence angle, at different polarization state of both fundamental and generated beams. We show that the measurements, together with the analytical curves, allow to retrieve the nonvanishing elements of the nonlinear optical tensor, including the ones introduced by optical chirality.

Surface 210 nm light emission from an AlN p–n junction light-emitting diode enhanced by A-plane growth orientation

(110) A-plane AlN p–n junction light-emitting diode (LED) with a wavelength of 210 nm is demonstrated. The electroluminescence from the A-plane LED is inherently polarized for the electric field parallel to the [0001] c-axis due to a negative crystal-field splitting energy. The polarization ratio (electric-field component ratio of parallel and perpendicular to c-axis) is as high as 0.9. The radiation pattern of the A-plane LED shows higher emission intensity along the surface normal, while that...

Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared single-photon detector technology. Next-generation devices are being developed with enhanced detection efficiency (DE) at key technological wavelengths via the use of optical cavities. Furthermore, new materials and substrates are being explored for improved fabrication versatility, higher DE, and lower dark counts. We report on the practical performance of packaged NbTiN SNSPDs fabricated on oxidized silicon substrates in the wavelength range from 830 to 1700 nm. We exploit constructive interference from the SiO₂/Si interface in order to achieve enhanced front-side fiber-coupled DE of 23.2 % at 1310 nm, at 1 kHz dark count rate, with 60 ps full width half maximum timing jitter.

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KEYWORDS and PACS

Keywords

infrared detectors, nanowires, niobium compounds, superconducting photodetectors, timing jitter, titanium compounds

PACS

85.25.Pb

Superconducting infrared, submillimeter and millimeter wave detectors
07.57.Kp

Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
85.60.Gz

Photodetectors (including infrared and CCD detectors)

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http://dx.doi.org/10.1063/1.3428960

PUBLICATION DATA

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0003-6951 (print)

1077-3118 (online)

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American Institute of Physics

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