Multiparameter Controllable Chiral Optical Patterns

Abstract

We demonstrate a method to generate multiparameter controllable chiral optical patterns. In the method, we introduce a phase calculation method of the rotation matrix and the transformation matrix. The controllable characteristics of the chiral optical patterns, which are generated by an annular subzone vortex phase plate, are demonstrated. The direction and spatial distribution of the eccentricity of the generated optical patterns can be freely regulated. The restriction on the direction of a chiral optical pattern by the single phase gradient (\ifmmode\pm\else\textpm\fi{}\ensuremath{\Delta}l) of an annular subzone vortex is solved. A chiral optical pattern is modulated by using the light-field superposition and phase shift, which is experimentally achieved by a spatial light modulator. The numerical and experimental results indicate that the controllable degrees of freedom are as many as five, namely, shape, size, direction, eccentricity, and number of arrays. Furthermore, we analyze the spatial propagation of the controllable chiral optical patterns in turbulence. The generation of chiral optical patterns has great potential application in optical tweezers, optical micromechanics, chiral microstructure fabrication, rotating microscopic illumination, and so on.