Reconfigurable transmissive metaphotonic devices for high-efficiency dynamic beam steering in the visible spectrum

We present a heterogeneous platform for realization of high-efficiency transmissive metaphotonic components through integration of dielectrics and phase-change materials. Combined with a new inverse design approach using Gaussian processes, we demonstrate a high-performance beam-steering reconfigurable metasurface in the transmission mode with dynamic switching between grating orders -1 and 1 in the visible spectrum. This device achieves an impressive efficiency of over 90%, setting a new benchmark for beam-steering applications