Wang, Ji Tong;
Li, Fengxia;
Panoiu, Nicolae C;
(2023)
Giant second-harmonic generation in photonic crystal slabs possessing double-resonance bound states in the continuum.
In: Schunemann, Peter G, (ed.)
Proceedings of SPIE - The International Society for Optical Engineering.
SPIE: San Francisco, California, United States.
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Abstract
The ability to confine and guide light makes photonic crystals (PhCs) a promising platform for large local field enhancement, which enables efficient nonlinear processes at the nanoscale. Here, we utilize optical bound states in the continuum (BICs) to engineer sharp resonances with high quality factors. By investigating the angleresolved reflection spectra, we demonstrate that two PhC slabs with different configuration but the same lattice constant support a pair of at-Γ and a pair of off-Γ resonances, respectively. In both cases, BIC-type resonances are observed at the fundamental frequency while BIC-like resonances are found at the second harmonic. This double-resonance phenomenon is subsequently used to significantly enhance the second-harmonic generation from PhC slabs. The maximum values of the SHG are several orders of magnitude larger than those corresponding to the reference slabs. We consider that our approach based on double-resonance BICs provides a novel way to realize enhanced harmonic generation in photonic nanodevices.
| Type: | Proceedings paper |
|---|---|
| Title: | Giant second-harmonic generation in photonic crystal slabs possessing double-resonance bound states in the continuum |
| Event: | SPIE LASE 2023 |
| Dates: | 28 Jan 2023 - 3 Feb 2023 |
| ISBN-13: | 9781510659155 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2653320 |
| Publisher version: | https://doi.org/10.1117/12.2653320 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Second harmonic generation, Photonic crystals Diffraction, Physics, Silicon nitride, Photonic nanostructures, Terahertz radiation, Polarization, Reflection, Resonance enhancement |
| UCL classification: | UCL 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: | https://discovery-pp.ucl.ac.uk/id/eprint/10171829 |
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