Time-switched metasurfaces as frequency multipliers for radiated modes

This contribution introduces an optical compressor based on a temporal metasurface that utilizes surface waves to upshift a low-frequency source to ultra-high-frequency free-space radiation. This is achieved by employing a metasurface that can switch from supporting surface waves to being transparent, resulting in a temporal interface. Analytical formulations and numerical simulations are provided to predict and verify the upshift and scattering parameters for the transmitted and reflected fields.