Enhanced Electro-Optic Modulation in Resonant Metasurfaces of Lithium Niobate

In display technologies or data processing, planar and subwavelength free-space components suited for flat photonic devices are needed. Metasurfaces, which shape the optical wavefront within hundreds of nanometers, can provide a solution thin portable devices, e.g. as CMOS-compatible modules. While conventional electro-optic modulators inconvenient to operate in free space configurations, its principle largely be applied development active metasurfaces with prospect modulation speeds up GHz region. Here, we use this concept realize fast continuous light at low voltage MHz speed lithium niobate metasurface tuned by linear effect. Furthermore, exploit resonance visible enhance transmitted two orders magnitude, namely factor 80, compared unstructured substrate. This proof-of-concept work is first important step towards modulation.