Spin angular momentum density and transverse energy flow of tightly focused kaleidoscope-structured vector optical fields

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.

Refractive multi-conical elements for cylindrical vector beam generation

“…Recently, the interest of researchers attracted tight focusing of vortex beams with hybrid types of polarizations,including high-order, spiral, Lissajous,kaleidoscopic, and other polarization [36][37][38][39][40][41][42][43][44] . This approach is used either to reduce the sizeof the focal spot or to control the 3Ddistribution in the focal area.…”

Generation of axially splitted ultra-long multiple optical needles/optical tubes using generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter

“…So that, generation of axial multiple focal structures in the focal plane using annular Walsh filters as a pupil filter is altering for prespecified methods. The Poynting vector distribution and spin angular momentum (SAM) have great interest in the field of optical trapping &manipulation [25][26][27][28][29][30][31][32][33][34][35]. Poynting vector describes the energy in the focal region.…”

Generation of Axially Splitted Ultra-Long Multiple Optical Needles/Optical Tubes Using Generalized Cylindrical Vector Bessel Gaussian Beam Phase Modulated by Annular Walsh Function Filter

“…So that, generation of axial multiple focal structures in the focal plane using annular Walsh filters as a pupil filter is altering for prespecified methods. The Poynting vector distribution and spin angular momentum (SAM) have great interest in the field of optical trapping &manipulation [25][26][27][28][29][30][31][32][33][34][35]. Poynting vector describes the energy in the focal region.…”