Affiliation:
1. Electronic Information School Wuhan University Wuhan 430072 China
2. Wuhan Institute of Quantum Technology Wuhan 430206 China
3. School of Microelectronics Wuhan University Wuhan 430072 China
4. Suzhou Institute of Wuhan University Suzhou 215123 China
Abstract
AbstractActively 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.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Jiangsu Province
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials