Nonlinear response of Q-boosting metasurfaces beyond the time-bandwidth limit.

ABSTRACT: Resonant nanostructures, such as photonic metasurfaces, have created an unprecedented case for enhanced light-matter interactions through local field engineering. However, the presence of resonances fundamentally limits the bandwidth of such interactions. Here, we report on amending the nonlinear optical response of a semiconducting metasurface through Q-boosting, where the Q-factor of a metasurface rapidly increases with time. The coupled-mode theory reveals overcoming the bandwidth limit by coupling a broadband signal to a bandwidth-matched resonance and Q-boosting at a timescale faster than a resonator lifetime. A control-excitation experiment simulation using a tailored Q-boosting silicon-germanium metasurface predicts the third-harmonic enhancement by factors of 8 (peak) and 4.5 (inte

SUBMITTER: Shafirin PA 

PROVIDER: S-EPMC11501905 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature