Giant second-harmonic generation in photonic crystal slabs possessing double-resonance bound states in the continuum

Ji Tong Wang; Fengxia Li; Nicolae C. Panoiu

doi:10.1117/12.2653320

14 March 2023 Giant second-harmonic generation in photonic crystal slabs possessing double-resonance bound states in the continuum

Ji Tong Wang, Fengxia Li, Nicolae C. Panoiu

Author Affiliations +

Proceedings Volume 12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII; 124050K (2023) https://doi.org/10.1117/12.2653320
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

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.

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Ji Tong Wang, Fengxia Li, and Nicolae C. Panoiu "Giant second-harmonic generation in photonic crystal slabs possessing double-resonance bound states in the continuum", Proc. SPIE 12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII, 124050K (14 March 2023); https://doi.org/10.1117/12.2653320

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