Plasmonic enhanced two-photon absorption in silicon photodetectors for optical correlators in the near-infrared | Zendy

Alexei Smolyaninov | Zendy; Mu-Han Yang | Zendy; Xin Lin | Zendy; Yeshaiahu Fainman | Zendy

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Plasmonic enhanced two-photon absorption in silicon photodetectors for optical correlators in the near-infrared

Author(s) -

Alexei Smolyaninov,

Mu-Han Yang,

Xin Lin,

Yeshaiahu Fainman

Publication year - 2016

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.41.004445

Subject(s) - materials science , femtosecond , photodetector , optics , optoelectronics , laser , silicon , plasmon , two photon absorption , interferometry , absorption (acoustics) , physics

A high-density array of plasmonic coaxial nanoantennas is used to enhance the two-photon absorption (TPA) process in a conventional silicon photodetector from a mode-locked 76 MHz Ti:sapphire laser over a spectral range from 1340 to 1550 nm. This enhanced TPA was used to generate an interferometric autocorrelation trace of a 150 fs laser pulse. Unlike second-harmonic generation, this technique does not require phase matching or a bulky crystal and can be used on a low-cost integrated silicon platform over a wide range of near-IR wavelengths compatible with modern commercial tunable femtosecond sources.

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