Realizing high-efficiency third harmonic generation via accidental bound states in the continuum.
Opt Lett
; 49(5): 1169-1172, 2024 Mar 01.
Article
in En
| MEDLINE
| ID: mdl-38426965
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 (343â
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 0.7â
GW/cm2. This approach allows the generation of an unprecedentedly high nonlinear conversion efficiency with simple structures.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Opt Lett
Year:
2024
Document type:
Article