Nonlinear Circular Dichroism with Resonant Metasurfaces

Koshelev, Kirill; Tang, Yi; Hu, Zixian; Kravchenko, Ivan I.; Li, Guixin; Kivshar, Yuri S.

doi:10.1364/cleo_qels.2022.fw1c.5

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2022

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“…[ 29,30 ] Recently, chiroptical nanostructures mediated by BICs have been proposed, demonstrating perfect chirality and ultrahigh Q‐factors. [ 31–34 ]…”

Section: Introductionmentioning

confidence: 99%

Dual‐Band Chiral Nonlinear Metasurface Supported by Quasibound States in the Continuum

et al. 2022

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This paper presents an all-dielectric chiral metasurface composed of an array of two-layer distorted square structures with nanoholes. This metasurface can simultaneously generate dual-band opposite chiral responses, which can be attributed to the bound states in the continuum (BICs) and the distorted chiral structure. By combining the BICs with chirality, a dual-band chiral nonlinear metasurface and a chiral-sensing method are proposed. The simulated results show that the third harmonic generation (THG) conversion efficiency can reach the order of 10 −4 for two peaks with a peak-pump intensity of approximately 5.3 GW cm −2 in the near-infrared region. Moreover, the third-harmonic circular dichroism for each peak can reach up to 0.99 and -0.94, respectively. Furthermore, it is theoretically demonstrated that this metasurface can be used for chiral sensing with high sensitivities. These results provide new insights for linear and nonlinear spin-dependent applications.

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“…[ 29,30 ] Recently, chiroptical nanostructures mediated by BICs have been proposed, demonstrating perfect chirality and ultrahigh Q‐factors. [ 31–34 ]…”

Section: Introductionmentioning

confidence: 99%