Giant enhancement of the effective Raman susceptibility in metasurfaces made of silicon photonic crystal nanocavities

We demonstrate that stimulated Raman amplification can be enhanced by more than four orders of magnitude in a silicon metasurface consisting of a periodic distribution of specially engineered photonic crystal (PhC) cavities in a silicon PhC slab waveguide. In particular, by designing the PhC cavitie...

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Bibliographic Details
Published inOptics express Vol. 26; no. 23; pp. 30383 - 30392
Main Authors Ren, Qun, You, Jian Wei, Panoiu, Nicolae C
Format Journal Article
LanguageEnglish
Published United States 12.11.2018
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Summary:We demonstrate that stimulated Raman amplification can be enhanced by more than four orders of magnitude in a silicon metasurface consisting of a periodic distribution of specially engineered photonic crystal (PhC) cavities in a silicon PhC slab waveguide. In particular, by designing the PhC cavities so as they possess two optical modes separated by the Raman frequency of silicon, one can achieve large optical field enhancement at both the pump and Stokes frequencies. As a consequence, the effective Raman susceptibility of the nonlinear metasurface, calculated using a novel homogenization technique, is significantly larger than the intrinsic Raman susceptibility of silicon. Implications to technological applications of our theoretical study are discussed, too.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.030383