Enhancement and manipulation of second- and third-harmonic generation based on all-dielectric nonlinear metasurfaces

https://phys.org/news/2024-06-harmonic-generation-based-dielectric-nonlinear.html

"nonlinear optical response,induced by guided mode resonance and bound states in continuum generating high-Q resonant spectral features... breaking centrosymmetric amorphous silicon metasurface structural symmetry, bound states transformed into quasi bound states in continuum, allowing coupling between these resonant states and radiative continuum... enhanced 2nd harmonic generation 550X, enhanced 3rd harmonic intensity 5,000X... nonlinear optics, photonics, quantum optics, optical imaging, sensing"