Compact generation of arbitrarily accelerating double caustic beams with orthogonal polarizations using a dielectric metasurface

Abstract

Compact launching double arbitrarily accelerating caustic beams with orthogonal polarizations based on a metasurface are presented. By only tailoring the phase of the transmitted fields from an amorphous silicon elliptical posts array, launching double arbitrarily accelerating caustic beams with orthogonal polarizations is achieved. The trajectories of vector caustic beams with orthogonal polarizations are dependent on the phase modulations through the structural units of the metasurfaces. By changing the polarization of the incident light, dynamic switching between two caustic beams is obtained. Compared to the traditional methods, the simple design method can provide a very compact device overcoming some limitations of the traditional methods for generating vector caustic beams. The results can be used for potential applications in integrated optics, polarization optics, dynamic beam shaping, biosensing, and micro-particle manipulation.