Tunable Plasmonic Resonance in Metasurface with Dielectric Nanocavity for Light Manipulation

Abstract

This manuscript introduces a dynamically tunable metasurface platform integrating plasmonic nanoantennas with dielectric nanocavities for advanced light manipulation. Through finite-difference time-domain simulations and experimental validation using nanofabricated gold-silica hybrids, the work demonstrates significant and reversible spectral control. Key findings include a substantial plasmonic resonance shift exceeding 100 nm via external stimuli such as electric fields, confirming active tuning. Furthermore, the platform exhibits strong amplitude modulation at a fixed wavelength, achieving high modulation depth essential for optical switching. These results underscore the efficacy of hybrid plasmonic-dielectric designs in achieving low-loss, reconfigurable control of light, paving the way for applications in adaptive flat optics, enhanced sensing, and high-speed photonic devices.