Nonlinear light conversion and infrared photodetection with laser-printed plasmonic metasurfaces supporting bound states in the continuum.

ABSTRACT: Plasmonic metasurfaces supporting high-quality (Q) resonances offer unprecedented ways for controlling light-matter interaction at the nanoscale, yet scalable fabrication of such sophisticated nanostructures still relies on expensive and multi-step fabrication routes, hindering their practical application. Here, we produced plasmonic metasurfaces composed of the regular arrangement of hollow protruding nanobumps via direct femtosecond laser patterning of thin gold films. By using comprehensive optical modeling, infrared spectroscopy and angle-resolved third harmonic generation experiments, we justified that such laser-printed nanostructures support symmetry-protected plasmonic quasi-bound states in the continuum (qBIC) with a measured Q-factor up to 20. Moreover, under critical coupling co

SUBMITTER: Pavlov DV 

PROVIDER: S-EPMC12757600 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature