Rotation of microparticles with Bessel beams generated by diffractive elements (original) (raw)

Optical Micro-Manipulation Using Laguerre-Gaussian Beams

Japanese Journal of Applied Physics, 2005

In this work we investigate the features of single-ringed Laguerre-Gaussian (LG) beams, often referred to as optical vortices, for laser trapping and micro-manipulation experiments that can not be performed using Gaussian beams. LG beams, exhibiting “doughnut”-like transversal intensity distributions and carrying orbital angular momentum (OAM) about their axis, greatly extend the capabilities of laser tweezers. LG beams can be obtained by converting the Gaussian beam generated by a common laser source, by means of phase-only diffractive optical elements (DOEs). We present a trapping system based on DOEs implemented on a liquid crystal display. Trapping of small dielectric high-index particles on the “doughnut” profile is demonstrated. Orbital angular momentum transfer to trapped particles, which are caused to rotate, is studied as a function of the doughnut radius. Moreover, low-index particles, that would be rejected by a conventional Gaussian beam, are trapped in the zero intensit...

Bessel & Laguerre-Gauss Beam Generation using SLM as a Reconfigurable Diffractive Optical Element

Bessel and LG beam of different orders are generated using Spatial Light Modulator (SLM) and also rotating Bessel and LG beam with programmable speed using the same SLM are produced, which needs no extra component or mechanical motion and can be used to rotate the micro particles with controlled speed, with a beam of particular mode, i.e., with a particular radius beam. The radius of a particular mode can also be changed if necessary.

Generation of nondiffracting Bessel beams by use of a spatial light modulator

Optics Letters, 2003

A laser beam with phase singularities is an interesting object to study in optics and may have important applications in guiding atoms and molecules. We explore the characteristics of a singularity in a nondiffracting Bessel beam experimentally by use of a programmable spatial light modulator with 64-level phase holograms. The diffraction efficiency with 64-level phase holograms is greatly improved in comparison with that obtained with a binary grating. The experiments show that the size and def lection angle of the beam can be controlled in real time. The observations are in agreement with scalar diffraction theory.

Manipulation of Microparticles By Bessel Light Beam

KnE Energy, 2018

We consider perspectives of optical manipulation of microscopic objects in the area of biology, biophysics and medicine. The first part of the work is devoted to a brief review of the microparticles' manipulation. The second part contains calculations of the focusing of laser radiation parameters and some results on the formation of Bessel light beams. The experimental setup based on the optical manipulation technique of micron-sized particles was developed.

Optical micromanipulation using a Bessel light beam

Optics communications, 2001

We demonstrate a technique for optical manipulation of micron-sized particles, including biological samples, using a zeroth-order Bessel light beam. The central maximum of such a beam oers a``non-diracting'' focal line of light. This line focus is well suited to rotationally align rod-like particles along the beam direction and to build stacks of particles. We have stacked up to nine 5 lm spheres above one another and manipulated this particle chain as a whole. Furthermore, we have observed laser guiding (transport) of 1 lm particles along the Bessel beam axis over 1 mm, which is over 10 times the Rayleigh range for a comparable Gaussian beam. Ó

Micromanipulation in higher-order Bessel beams

Optical Memory and Neural Networks, 2007

We discuss experiments on micromanipulation in the higher-order Bessel beams generated by diffractive optical elements (DOEs). Comparison is made of the rotation efficiency in the Bessel beams of the fifth and tenth order. We show that a two-fold increase in the Bessel beam number results in about a two-fold increase of the linear velocity of the microparticle circular movement, despite the fact that the laser beam intensity shows over a three-fold decrease.

Generation of generalized spiraling Bessel beams of arbitrary order by curved fork-shaped holograms

Optical and Quantum Electronics, 2016

Generalized spiraling Bessel beams (GSBB) of arbitrary order are created by illuminating a curved fork-shaped hologram (CFH) by Laguerre-Gaussian beam (LGB). The analytical expressions of the diffracted wave field amplitudes and intensities are calculated and analyzed using the stationary phase method. The numerical results are given to understand the features of the GSBB by using CFH. Our finding provides the study of the LGB with null mode number n and azimuthal mode index l and the fundamental Gaussian beam through the considered optical system, which are as particular cases of the present investigation.

Bessel Beam: Significance and Applications—A Progressive Review

Micromachines

Diffraction is a phenomenon related to the wave nature of light and arises when a propagating wave comes across an obstacle. Consequently, the wave can be transformed in amplitude or phase and diffraction occurs. Those parts of the wavefront avoiding an obstacle form a diffraction pattern after interfering with each other. In this review paper, we have discussed the topic of non-diffractive beams, explicitly Bessel beams. Such beams provide some resistance to diffraction and hence are hypothetically a phenomenal alternate to Gaussian beams in several circumstances. Several outstanding applications are coined to Bessel beams and have been employed in commercial applications. We have discussed several hot applications based on these magnificent beams such as optical trapping, material processing, free-space long-distance self-healing beams, optical coherence tomography, superresolution, sharp focusing, polarization transformation, increased depth of focus, birefringence detection base...

Manipulation of microparticles using Bessel beams from semiconductor lasers

2014

Optical manipulation of microscopic objects (including living cells) using Bessel beams from semiconductor lasers has been demonstrated for the first time. In addition, it has been found in the experi ments that a Bessel beam of sufficient power from a semiconductor laser makes it possible to manipulate simultaneously several microscopic objects captured into its central lobe and the first ring.

Generation of multiple Bessel beams for a biophotonics workstation

Optics Express, 2008

We present a simple method using an axicon and spatial light modulator to create multiple parallel Bessel beams and precisely control their individual positions in three dimensions. This technique is tested as an alternative to classical holographic beam shaping commonly used now in optical tweezers. Various applications of precise control of multiple Bessel beams is demonstated within a single microscope giving rise to new methods for three-dimensional positional control of trapped particles or active sorting of micro-objects as well as "focus-free" photoporation of living cells. Overall this concept is termed a Biophotonics Workstation where users may readily trap, sort and porate material using Bessel light modes in a microscope.