Abstract
We propose a novel scheme for designing and generating kaleidoscope-structured vector optical fields (KS-VOFs) by analogy with the principle of multiple mirror reflection in a kaleidoscope. For KS-VOFs with symmetric polarization states, we show the symmetry properties of the focal fields with various shapes for different applications. The redistributing symmetric local spin angular momentum (SAM) density indicates that the design method of the KS-VOFs plays a role as a catalyst to the redistribution process of polarization states and local SAM conversion in the tight focusing process. Meanwhile, the controllable transverse energy flow in the focal plane can be used to transport multiple absorptive particles and then to be fixed at certain locations. Our results may find applications in optical machining, trapping, and manipulation.
Highlights
Polarization, as an intrinsic nature of light, plays an important role in engineering the optical field and controlling the interaction of light with matter
We show various weakly and tightly focused fields and deeply explore the redistributing symmetric spin angular momentum (SAM) density and transverse energy flow of the tightly focused kaleidoscopestructured vector optical fields (VOFs) (KS-VOFs), which are useful in realms such as optical machining, trapping, and manipulation
We have presented and generated a new kind of KS-VOFs, which is designed by analogy with the principle of multiple reflection in the kaleidoscope
Summary
Polarization, as an intrinsic nature of light, plays an important role in engineering the optical field and controlling the interaction of light with matter. We can always find certain mirror symmetry in the polarization states of the VOFs and the focal intensity patterns.. An Ronchi phase grating with transmission function of t(x, y) = 2π[0.5 + 0.5 cos(2πf0x)] is placed in the output plane of the 4f system to superpose the two orders diffracted from the grating on SLM With this scheme, we can generate local linearly polarized VOFs with arbitrary spatial distribution. As for the x-component intensity pattern of the KS-VOF, the number of symmetric axes is not always the same as the total intensity. This can be speculated by the original polarization states of the KS-VOF. The experimental results are in good agreement with the simulated ones
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