From SHG to mid-infrared SPDC generation in strained silicon waveguides

Claudio Castellan; Alessandro Trenti; Mattia Mancinelli; Alessandro Marchesini; Mher Ghulinyan; Georg Pucker; Lorenzo Pavesi

doi:10.1117/12.2273641

29 August 2017 From SHG to mid-infrared SPDC generation in strained silicon waveguides

Claudio Castellan, Alessandro Trenti, Mattia Mancinelli, Alessandro Marchesini, Mher Ghulinyan, Georg Pucker, Lorenzo Pavesi

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Proceedings Volume 10358, Quantum Photonic Devices; 1035804 (2017) https://doi.org/10.1117/12.2273641
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

Abstract

The centrosymmetric crystalline structure of Silicon inhibits second order nonlinear optical processes in this material. We report here that, by breaking the silicon symmetry with a stressing silicon nitride over-layer, Second Harmonic Generation (SHG) is obtained in suitably designed waveguides where multi-modal phase-matching is achieved. The modeling of the generated signal provides an effective strain-induced second order nonlinear coefficient of χ⁽²⁾ = (0.30 ± 0.02) pm/V. Our work opens also interesting perspectives on the reverse process, the Spontaneous Parametric Down Conversion (SPDC), through which it is possible to generate mid-infrared entangled photon pairs.

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Claudio Castellan, Alessandro Trenti, Mattia Mancinelli, Alessandro Marchesini, Mher Ghulinyan, Georg Pucker, and Lorenzo Pavesi "From SHG to mid-infrared SPDC generation in strained silicon waveguides", Proc. SPIE 10358, Quantum Photonic Devices, 1035804 (29 August 2017); https://doi.org/10.1117/12.2273641

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