Silicon Metasurface Hits 1.2e-6 THG Efficiency via Multiband Quasi-BIC Resonances
Preprint demonstrates multiband all-dielectric metasurface achieving experimental THG efficiency of 1.2e-6 via QBICs. Evidence from fabricated devices and multipolar analysis supports route to compact UV sources. Key limitation remains gap between simulated and measured performance due to fabrication imperfections.
Related work on silicon BIC metasurfaces for second-harmonic generation (e.g., Koshelev et al., Science 2019) and recent high-Q GaP platforms shows consistent scaling of nonlinear yield with Q-factor squared, validating the multiband strategy here. If surface roughness can be reduced below 2 nm RMS, the platform could reach 10^{-4} efficiency within a year, enabling practical on-chip UV generation for endoscopic imaging.
Bagci group: Within 18 months a packaged device using this metasurface will demonstrate >5e-5 THG efficiency at <1 GW/cm^{2} in a benchtop UV microscope prototype.
Sources (2)
- [1]Primary Source(https://arxiv.org/abs/2608.13746)
- [2]Supporting Source(https://www.science.org/doi/10.1126/science.aas9768)