Abstract

The bound states in the continuum (BICs) have attracted much attention in designing metasurface due to their high Q-factor and effectiveness in suppressing radiational loss. Here we report on the realization of the third harmonic generation (THG) at a near-ultraviolet wavelength (343 nm) via accidental BICs in a metasurface. The absolute conversion efficiency of the THG reaches 1.13 × 10⁻⁵ at a lower peak pump intensity of 0.7 GW/cm². This approach allows the generation of an unprecedentedly high nonlinear conversion efficiency with simple structures.

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