Immersion‐Triggered Switchable Quasi‐BIC with Optical Encryption from 1.5D Metagratings

Abstract

Actively tuning quasi‐bound states in the continuum (q‐BIC) has emerged as a prominent theme in nanophotonics due to its tailored light–matter interaction. However, the practical controllable q‐BIC metadevices still exhibit critical challenges for achieving convenient tuning in the visible regime with strong reversibility and large‐area implementation. Herein, an immersion‐triggered tuning approach is demonstrated for switchable q‐BIC in the visible regime using 1.5D metagratings. Moreover, by employing the water as the trigger, active q‐BIC‐based optical information encryption is demonstrated due to the spectra alternation. In addition, the proposed q‐BIC is insensitive to incident angles regarding quality factor, resonant wavelength, and modulation depth (MD). This immersion‐triggered strategy for q‐BIC offers a practical tuning approach for achieving dynamic switchable optical functionalities, with potential applications in metasurface‐empowered active q‐BIC optical devices.

Electrical-Driven Dynamic Augmented Reality by On-Chip Vectorial Meta-Display

“…However, heading toward next-generation wearable smart optical display meta-devices, most previous on-chip metasurfaces mainly remain static and lack practical dynamic control capability, significantly restricting their broad implementation in actual scenes. Despite that previous active tuning strategies based on thermal, , mechanical, , liquid immersion, − optical, − and electrical − schemes have been investigated for manipulating free-space light, a practically accessible tuning solution remains unveiled to achieve dynamic functionality for on-chip meta-optics. On the other hand, although some on-chip integrated metasurfaces have enabled guided wave-driven meta-holographic displays, they suffer from limited numbers of available polarization states in addition to the complicated nanostructure design with varying dimensions, which hinders their versatility in practical applications.…”