Performance analysis of single-focus phase singularity based on elliptical reflective annulus quadrangle-element coded spiral zone plates

Abstract

Optical vortices generated by the conventional vortex lens are usually disturbed by the undesired higher order foci which may lead to additional artifacts and thus degrade contrast sensitivity. Herein, in this work, we propose an efficient methodology to combine the merit of elliptical reflective zone plates (ERZPs) and the advantage of spiral zone plates (SZPs) in establishing a specific single optical element, termed elliptical reflective annulus quadrangle-element coded spiral zone plates (ERAQSZPs) to generate single-focus phase singularity. Differing from the abrupt reflectance of the ERZPs, series of randomly distributed nanometer apertures are adopted to realize the sinusoidal reflectance. Typically, according to our physical design, the ERAQSZPs are fabricated on a bulk substrate, therefore, the new idea can significantly reduce the difficulty in the fabrication process. Based on the Kirchhoff diffraction theory and convolution theorem, the focusing performance of ERAQSZPs was calculated. The results reveal that, apart from the capability of generating optical vortices, ERAQSZPs can also integrate the function of focusing, energy selection, higher order foci elimination as well as high spectral resolution together. In addition, the focusing properties can be further improved by appropriately adjusting the parameters such as zone number and the size of the consisted primitives. These findings are expected to direct a new direction towards improving the performance of optical capture, x-ray fluorescence spectra, and forbidden transition.

The Generation of Equal-Intensity and Multi-Focus Optical Vortices by a Composite Spiral Zone Plate

“…Accurate manipulation of microscopic particles can be achieved using optical vortices, such as optical rotation traps [9,10]. Additionally, applications of optical vortices in microscope imaging can provide higher resolution and better demonstration of fine Photonics 2024, 11, 466 2 of 11 structures and super-resolution microscope imaging can be accomplished by manipulating the phase and angular momentum of optical vortices [11][12][13].…”