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

Abstract

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

References in corpus (6)

• Magnetic light
• Chiral plasmonics
• Metasurfaces with maximum chirality empowered by bound states in the continuum
• Continuous wave second harmonic generation enabled by quasi-bound-states in the continuum on gallium phosphide metasurfaces
• Deterministic polarization chaos from a laser diode
• Nonlinear circular dichroism in Mie-resonant nanoparticle dimers

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• Enhanced sum-frequency generation from etchless lithium niobate empowered by dual quasi-bound states in the continuum
• Introducing a Symmetry-Breaking Coupler into a Dielectric Metasurface Enables Robust High-Q Quasibound States in the Continuum and Efficient Nonlinear Frequency Conversion
• Si Metasurface Supporting Multiple Quasi-BICs for Degenerate Four-Wave Mixing
• Tuning nonlinear second-harmonic generation in AlGaAs nanoantennas via chalcogenide phase change material
• When does nonlinear circular dichroism appear in achiral dielectric nanoparticles?
• Impulsive stimulated scatttering signal in supercooled liquids with Debye or Havriliak-Negami relaxation of the specific heat capacity and thermal expansion coefficient