Multi-resonant high-Q metasurfaces for optical imaging and information encoding (Invited Paper)

In this era of digital advancement, securing communication and data has become crucial. Nanophotonic metasurfaces have shown great potential in light manipulation, but they are limited in spectral range and wavelength handling. This limitation hampers their effectiveness in optical imaging and information encryption, where broader spectral coverage and multiple resonant peaks are desired. We propose an innovative approach to address these challenges. Our multi-resonant high-Q metasurface platform integrates subwavelength plasmonic meta-atoms with a specially designed DBR substrate. This platform enables simultaneous excitation of multiple high-Q resonant modes across a broad spectrum. Through optimizing the nanostructures, the metasurface can support up to 15 high-Q peaks without compromising operational efficiency. To demonstrate our platform's performance, we present two practical applications. The first is a hyperspectral imaging system using a single multi-wavelength metasurface chip. The second application combines structural color printing and vectorial holographic imaging for advanced optical information encryption, leveraging our platform's capabilities.