Efficient second-harmonic generation based on off-Γ merging bound states in the continuum.
Opt Lett
; 48(24): 6589-6592, 2023 Dec 15.
Article
in En
| MEDLINE
| ID: mdl-38099806
ABSTRACT
Ultracompact devices engineered for second-harmonic generation (SHG) hold a significant promise across a diverse spectrum of applications. Here, we propose a merging bound state in the continuum at an off-Γ point in a reciprocal space with the anisotropic materials lithium niobate. Such a merging BIC yields a profound reduction in radiative loss and scattering losses while concurrently exhibiting a substantial enhancement in the quality factor. As a result, we achieved a noteworthy SHG efficiency (η = 3.7%) at the incident angle θ = 10° when the pump intensity I0 = 2â
kW/cm2, outperforming alternative nanostructures designed for SHG. This research contributes valuable insights into the feasibility of metadevices founded on the principles of nanoengineering applied to traditional nonlinear crystals. Such advancements hold a considerable promise for the development of compact, high-performance SHG devices across a range of applications.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Opt Lett
Year:
2023
Document type:
Article