Dynamic Thermal Emission Steering with Active Metasurfaces

Active control over various properties of thermal emission can be accomplished through elaborate engineering of optical states without altering the temperature of the object. This presentation introduces our study on the dynamic steering of thermal emission using a graphene-based metasurface device. We employ a laterally delocalized Fabry-Perot mode, whose phase condition can be actively tuned by adjusting the graphene's carrier density via electrostatic gating. We experimentally demonstrate that the device can steer thermal emission across a 16-degree range at a wavelength of 6.61 microns, while maintaining high emissivity.