An asymmetric color-image cryptosystem based on spiral phase transformation and equal modulus decomposition
Sign Up to like & getrecommendations! Published in 2020 at "Optics and Laser Technology"
DOI: 10.1016/j.optlastec.2020.106106
Abstract: Abstract In this paper, we propose an asymmetric color-image cryptosystem based on spiral phase transform (SPT) and equal modulus decomposition (EMD). The original image is divided into three-channel components of R, G and B firstly.… read more here.
Keywords: spiral phase; phase; image; modulus decomposition ... See more keywords
Method for exploring the topological charge and shape of an optical vortex generated by a spiral phase plate
Sign Up to like & getrecommendations! Published in 2021 at "Optics and Laser Technology"
DOI: 10.1016/j.optlastec.2021.107098
Abstract: Abstract A spiral phase plate (SPP) represents one of the most efficient and cost-effective optical devices used for vortex beam generation. In this work, we studied, both experimentally and theoretically, the effect of illumination of… read more here.
Keywords: phase; phase plate; topological charge; spiral phase ... See more keywords
Dielectric Metasurface for Synchronously Spiral Phase Contrast and Bright-Field Imaging.
Sign Up to like & getrecommendations! Published in 2023 at "Nano letters"
DOI: 10.1021/acs.nanolett.3c00388
Abstract: Spiral phase contrast imaging and bright-field imaging are two widely used modes in microscopy, providing distinct morphological information about objects. However, conventional microscopes are always unable to operate with these two modes at the same… read more here.
Keywords: field imaging; bright field; phase contrast; microscopy ... See more keywords
Dynamic multilevel spiral phase plate generator
Sign Up to like & getrecommendations! Published in 2018 at "Scientific Reports"
DOI: 10.1038/s41598-018-34041-2
Abstract: The design and characterisation of a reconfigurable multi-level spiral phase plate is shown. The device is based on a pie-shape liquid-crystal structure with 24 slices driven by custom electronics that allow independent excitation control of… read more here.
Keywords: spiral phase; dynamic multilevel; multilevel spiral; phase plate ... See more keywords
Experimental evaluation of 3D printed spiral phase plates for enabling an orbital angular momentum multiplexed radio system
Sign Up to like & getrecommendations! Published in 2019 at "Royal Society Open Science"
DOI: 10.1098/rsos.191419
Abstract: This paper evaluates the performance of three-dimensionally (3D) printed spiral phase plates (SPPs) for enabling an orbital angular momentum (OAM) multiplexed radio system. The design and realization of the SPPs by means of additive manufacturing… read more here.
Keywords: spiral phase; radio system; multiplexed radio; printed spiral ... See more keywords
Study on optical hierarchical sorting of particles based on the Fraunhofer diffraction field of spiral phase plate array
Sign Up to like & getrecommendations! Published in 2020 at "Optical Engineering"
DOI: 10.1117/1.oe.59.11.115104
Abstract: Abstract. Optical hierarchical sorting has attracted significant attention in recent years. The existing approaches use either complex numerical calculation or computer-aided experimental tools for optical hierarchical sorting. We proposed a method to perform hierarchical sorting,… read more here.
Keywords: phase plate; optical hierarchical; hierarchical sorting; spiral phase ... See more keywords
Multiple-image encryption based on angular-multiplexing holography with quick response code and spiral phase keys.
Sign Up to like & getrecommendations! Published in 2019 at "Applied optics"
DOI: 10.1364/ao.58.0000g6
Abstract: In this research, a novel optical multiple-image encryption method based on angular-multiplexing holography, quick response (QR) code, and spiral phase keys is proposed. With this method, images are transformed into QR codes and subsequently encrypted… read more here.
Keywords: spiral phase; image encryption; multiple image; angular multiplexing ... See more keywords
Spectral control of the orbital angular momentum of a laser beam based on 3D properties of spiral phase plates fabricated for an infrared wavelength.
Sign Up to like & getrecommendations! Published in 2020 at "Optics express"
DOI: 10.1364/oe.396199
Abstract: This paper examines the spectral properties of a spiral phase plate (SPP) generating orbital angular momentum (OAM) beams. A simple method is proposed for calculating the resulting OAM by measuring only two maximum expansion coefficients.… read more here.
Keywords: spiral phase; orbital angular; angular momentum; properties spiral ... See more keywords
Quantized spiral-phase-modulation based deep learning for real-time defocusing distance prediction.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.460858
Abstract: Whole slide imaging (WSI) has become an essential tool in pathological diagnosis, owing to its convenience on remote and collaborative review. However, how to bring the sample at the optimal position in the axial direction… read more here.
Keywords: time; quantized spiral; defocusing distance; deep learning ... See more keywords
Wavelength-tunable spiral-phase-contrast imaging.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.461660
Abstract: Wavelength-tunable spiral-phase-contrast (SPC) imaging was experimentally accomplished in the visible wavelengths spanning a broad bandwidth of ∼200 nm based on a single off-axis spiral phase mirror (OSPM). By the rotation of an OSPM, which was… read more here.
Keywords: spiral phase; spc imaging; wavelength tunable;
Off-axis spiral phase mirrors for generating high-intensity optical vortices.
Sign Up to like & getrecommendations! Published in 2020 at "Optics letters"
DOI: 10.1364/ol.387363
Abstract: In this work, we present a novel, to the best of our knowledge, and practical method for generating optical vortices in high-power laser systems. Off-axis spiral phase mirrors are used at oblique angles of incidence… read more here.
Keywords: optical vortices; high power; spiral phase; phase ... See more keywords