Electro-optically Modulated Reflective and Transmissive Metasurfaces

Abstract

While the passive plasmonic/all-dielectric metasurfaces have shown their potentials in various beam forming/shaping applications, their fixed functionality is known as a drawback, limiting their futuristic applications in next-generation of ultra-compact photonic integrated devices. It is known that the hybridization of recently emerged functional materials with conventional metasurfaces can lead to the implementation of dynamically tunable metasurfaces with real-time control over the wave-front of scattered light. Here, we propose several advanced dynamic platforms based on gate-tunable biasing and integration of indium-tin-oxide (ITO) and doped-semiconductors into all-dielectric/plasmonic nanostructures. Besides the widely-utilized gap-plasmon and Mie-type resonances to enhance the light-matter interaction, we focus on the excitation of guided-mode and Fabry-Perot-type resonances with relatively higher quality-factors. This can potentially pave the way toward brand-new highly-efficient tunable reflective and transmissive optical metasurfaces in near-infrared (NIR) regime.