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We use numerical simulations to demonstrate third-harmonic generation withnear-unity nonlinear circular dichroism (CD) and high conversion efficiency ($10^{-2}\ \text{W}^{-2}$) in asymmetric Si-on-SiO$_2$ metasurfaces. The workingprinciple relies on the selective excitation of a quasi-bound state in thecontinuum, characterized by a very high ($>10^5$) quality-factor. By tuningmulti-mode interference with the variation of the metasurface geometricalparameters, we show the possibility of independent control of linear CD andnonlinear CD. Our results pave the way for the development of all-dielectricmetasurfaces for nonlinear chiro-optical devices with high conversionefficiency.

Near-unity third-harmonic circular dichroism driven by quasi-BIC in asymmetric silicon metasurfaces