Floquet rotation unlocks rotational super-radiance in a photonic ring
Researchers demonstrate Floquet-based rotation in a ring network of spatio-temporally modulated resonators, creating angular-momentum bandgaps and enabling energy extraction from a rotating medium. The experiment shows angular-momentum–selective amplification (rotational super-radiance) through non-Hermitian, parametric dynamics in a space–time crystal, providing a controllable platform to study rotational energy transfer and wave amplification in time-modulated media.