Intracavity spatiotemporal metasurfaces

Optical metasurfaces are endowed with unparallel flexibility to manipulate the light field a subwavelength spatial resolution. Coupling materials strong optical nonlinearity may allow ultrafast spatiotemporal modulation. However, most demonstrated thus far linear devices. Here, we experimentally demonstrate simultaneous laser mode control using single-layer plasmonic metasurface strongly coupled an epsilon-near-zero (ENZ) material within fiber cavity. While geometric phase of is utilized convert laser’s transverse from Gaussian beam vortex carrying orbital angular momentum, giant nonlinear saturable absorption ENZ enables pulsed generation via Q-switching process. The direct integration in cavity pave way for development miniaturized sources tailored and temporal profiles, which can be useful numerous applications, such as superresolution imaging, high-density storage, three-dimensional lithography.