29 August 2017 From SHG to mid-infrared SPDC generation in strained silicon waveguides
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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, Lorenzo Pavesi, "From SHG to mid-infrared SPDC generation in strained silicon waveguides", Proc. SPIE 10358, Quantum Photonic Devices, 1035804 (29 August 2017); doi: 10.1117/12.2273641; https://doi.org/10.1117/12.2273641
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