Rotating structured light based on perfect vortex

Abstract

Abstract In this letter, we experimentally demonstrated a simplified rotating structured light consisting of two overlapping perfect vortices that are generated by focusing two coaxial Bessel beams with different longitudinal wavenumbers. Named perfect rotating wave (PRW), this beam inherits the characteristic of perfect vortex whose radius is controllable and frozen wave whose transverse intensity profile rotates along transmission direction. The no-sidelobes intensity distribution of PRW facilitates the orientation measurement. Because of the linear responds to the Bessel beams’ propagation distance, the orientation of PRW could be applied in remote sensing to measure optical path, temperature, refractive index and so on.