Realizing High-Efficiency Third Harmonic Generation Via Accidental Bound States in the Continuum.
OPTICS LETTERS(2024)
摘要
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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关键词
Terahertz Metamaterials,Terahertz,Transformation Optics
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