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

Ren, Q; You, JW; Panoiu, NC; (2018) Giant enhancement of the effective Raman susceptibility in metasurfaces made of silicon photonic crystal nanocavities. Optics Express , 26 (23) pp. 30383-30392. 10.1364/OE.26.030383. Green open access

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Abstract

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.

Type: Article
Title: Giant enhancement of the effective Raman susceptibility in metasurfaces made of silicon photonic crystal nanocavities
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.26.030383
Publisher version: http://doi.org/10.1364/OE.26.030383
Language: English
Additional information: Copyright © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/10063007
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