Recent Advances on Tunable Vortex Beam Devices for Biomedical Applications

Shen, Yijie; Yang, Xilin; Qi, Ruoyang; Wan, Zhensong; Fu, Xing; Gong, Mali

doi:10.26717/bjstr.2018.09.001801

Cited by 5 publications

(3 citation statements)

References 66 publications

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“…Compared with normal Gaussian-beams, optical vortex beam has its advantage of the intensity of beam center is zero, also called phase singularities [2]. Due to aforementioned unique personalities, optical vortex beams have been widely applied in bio-photonics [3] and optical communication field [4,5], including improving the capacity of communication system [6], and transmitting messages as a carrier.…”

Section: Introductionmentioning

confidence: 99%

40.1: Liquid Crystal Polymer Phase Plates Fabricated by Direct Laser Writing

Zou

Liu

Zhang

et al. 2023

Symp Digest of Tech Papers

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Optical vortex is a type of structured beam that carry orbital‐angular momentum (OAM) with different topological charge numbers. In this paper, we fabricate liquid crystal polymer phase plates to generate vortex beams by femtosecond 3D direct laser writing. Instead of using traditional photoresists, we compound liquid crystal monomers to create different structures. As a two‐photon direct laser writing technique, Nanoscribe is of high resolution of 100 nm, which implements high accuracy of our structures. We design spiral phase plate (SPP) with diameter of 25µm and a total height difference h of 1.25um to generate vortex beams with different topological charge numbers. We also set up the interference system to characterize the vortex beam. With the interference beam coupled, the presence of the vortex is experimentally indicated by the fringe “dislocation defects” at the center of the vortex in visible region. It presents a new way to fabricate liquid crystal polymer structures with unique birefringent properties, indicating new possibilities in photonics application.

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Section: Introductionmentioning

confidence: 99%

40.1: Liquid Crystal Polymer Phase Plates Fabricated by Direct Laser Writing

Zou

Liu

Zhang

et al. 2023

Symp Digest of Tech Papers

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“…The idea that orbital angular momentum (OAM) can exist within OVs, and a method of generating it, was first suggested by Allen et al [8], thus providing a new way to study the effects of the connection between quantum and classical optics (paraxial beams). Studies that involve OVs range from research on the use of optical tweezers for particle trapping and manipulation [9], quantum applications [10][11][12][13], biomedical applications [14], superhigh-resolution imaging [15][16][17], optical communications [18], and ultraviolet and X-ray light [19,20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Spatio-Temporal Couplings on Focused Optical Vortices

2022

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Ultra-intense laser pulses with helical phases are of interest in laser-driven charged particle acceleration and related experiments with extreme light. However, such optical vortices can be affected by the presence of residual spatial-temporal couplings. Their field distributions after propagating in free-space and in the focal plane of an ideal focusing mirror were assessed through numerical modeling, based on the Gaussian decomposition method for a 25 fs pulse with a Supergaussian spatial profile. The wash-out of the central hole in the doughnut-shaped profile in the focal plane corresponds to the rotation of the phase discontinuity.

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“…At the same time, optical information can be read off both by analyzing the frequency spectrum [3][4][5] and the spectrum of optical vortices [6,7]. An important aspect of this problem is the study of biomedical objects [8,9], for example, the composition of the blood or the reflection of a vortex beam from the skin surface [10] for express diagnostics of skin diseases. The fact is that a vortex beam scattered by the skin is transformed into a speckle-like structure resembling one that occurs when light passes through a medium with weak turbulence [11,12].…”

Section: Introductionmentioning

confidence: 99%

Digital Sorting of Optical Vortices in Perturbed Singular Beams

Volyar¹,

Bretsko²,

Akimova³

et al. 2021

Nonlinear Optics - From Solitons to Similaritons

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The chapter provides a brief overview of shaping and measuring techniques of the vortex spectra (squared amplitudes and initial phases of vortex modes) including radial indices. The main physical mechanisms causing the formation of laser beams with a complex vortex composition, in particular, in biological media, are indicated, and the need for a digital analysis of vortex spectra is substantiated. It is the analysis of vortex spectra that allows us to find the orbital angular momentum and informational entropy (Shannon's entropy) of perturbed laser beams in real time. In the main part of the chapter, we consider in detail a new approach for measuring vortex spectra without cuts and gluing of the wavefront, based on digital analyzing high-order intensity moments of complex beams and sorting the vortex beam in computer memory sells. It is shown that certain types of weak local inhomogeneities cause a vortex avalanche causing a sharp dips and bursts of the orbital angular momentum spectra and quick ups and downs of the informational entropy. An important object of analysis is also the vortex spectra of beams scattered by simple opaque obstacles such as a hole, a disk, and a sector aperture.

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Recent Advances on Tunable Vortex Beam Devices for Biomedical Applications

Cited by 5 publications

References 66 publications

40.1: Liquid Crystal Polymer Phase Plates Fabricated by Direct Laser Writing

40.1: Liquid Crystal Polymer Phase Plates Fabricated by Direct Laser Writing

Influence of Spatio-Temporal Couplings on Focused Optical Vortices

Digital Sorting of Optical Vortices in Perturbed Singular Beams

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