Optical trapping with Bessel beams generated from semiconductor lasers (original) (raw)
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.
Optical trapping with superfocused high-M 2 laser diode beam
Laser Resonators, Microresonators, and Beam Control XVII, 2015
Many applications of high-power laser diodes demand tight focusing. This is often not possible due to the multimode nature of semiconductor laser radiation possessing beam propagation parameter M 2 values in double-digits. We propose a method of 'interference' superfocusing of high-M 2 diode laser beams with a technique developed for the generation of Bessel beams based on the employment of an axicon fabricated on the tip of a 100 μm diameter optical fiber with highprecision direct laser writing. Using axicons with apex angle 140 0 and rounded tip area as small as ~10 μm diameter, we demonstrate 2-4 μm diameter focused laser 'needle' beams with approximately 20 μm propagation length generated from multimode diode laser with beam propagation parameter M 2 =18 and emission wavelength of 960 nm. This is a few-fold reduction compared to the minimal focal spot size of ~11 μm that could be achieved if focused by an 'ideal' lens of unity numerical aperture. The same technique using a 160 0 axicon allowed us to demonstrate few-μm-wide laser 'needle' beams with nearly 100 μm propagation length with which to demonstrate optical trapping of 5-6 μm rat blood red cells in a water-heparin solution. Our results indicate the good potential of superfocused diode laser beams for applications relating to optical trapping and manipulation of microscopic objects including living biological objects with aspirations towards subsequent novel lab-on-chip configurations.
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.
Non-diffracting beam synthesis used for optical trapping and delivery of sub-micron objects
SPIE Proceedings, 2006
We demonstrate the use of interference between non-diffracting Bessel beams (BB) to generate a system of optical traps. They offer sub-micron particle confinement, delivery and organization over a distance of hundreds of µm. We analyze system of two identical counter-propagating BBs and the case of two co-propagating BBs with different propagation constants separately. In both of these cases, the interference results in periodic on-axis intensity oscillations involving particle confinement. Altering the phase of one of the interfering beams, the whole structure of optical traps can be shifted axially. Implementing this conveyor belt enables the particle delivery over the whole distance where the optical traps are strong enough for particle confinement. Experimentally we succeeded with generation of both of these systems. In case of two counter-propagating BBs we observed a strong sub-micron particle confinement, while in case of co-propagating BBs the confinement was observed only with help of fluid flow against the radiation pressure of both beams.
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.
Manipulating gradient forces on optical tweezers using bessel beams
2007 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, 2007
In this paper, we show how one can change the stable equilibrium of a particle trapped into an optical tweezer by varying the intensity of superposed Bessel beams with different orders. The gradient forces acting on particles of different radii are determined, and the theoretical results indicates that it is possible to combine Bessel beams in such a way as to manipulate the particle into or out the centre of the beam by exploiting their ring-shaped intensity patterns, without any mechanical displacement of the lasers.
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
Laser trapping and micro-manipulation using optical vortices
Microelectronic Engineering, 2005
The aim of this work is to investigate the usefulness of the Laguerre-Gaussian (LG) beams, often referred to as optical vortices, for laser trapping and manipulation experiments that cannot be performed using Gaussian beams. Laguerre-Gaussian beams, exhibiting ''doughnut''-like transversal intensity distributions and carrying orbital angular momentum (OAM), greatly extended the capabilities of laser tweezers. These beams can be obtained by converting the Gaussian beam generated by a common laser source, by means of properly designed diffractive optical elements (DOEs). We present two trapping systems, the first one based on amplitude DOEs, the second one based on phase DOEs. In both cases the DOE is implemented on a liquid crystal display. Trapping of small dielectric high-index particles on the ''doughnut'' profile is demonstrated. OAM transfer to trapped particles, that are caused to rotate, is observed as well. Moreover, low-index particles, that would be rejected by a conventional Gaussian beam, are trapped in the zero intensity region of the doughnut.
Optics Express, 2010
A Bessel-like beam was generated in a novel all-fiber integrated structure. A concentric ring intensity pattern was achieved by the multimode interference along the coreless silica fiber, which was then focused by the integrated micro-lens to result in a Bessel-like beam. The average beam diameter of 7.5 μm maintained over 500 μm axial length for a continuous wave Yb-doped fiber laser input oscillating at the wavelength of 1.08 μm. The generated beam was successfully applied to two-dimension optical trapping and longitudinal transport of multiple dielectric particles confirming its unique non-diffracting and self-reconstructing nature. Physical principle of operation, fabrication, and experimental results are discussed.
Design of a high-performance optical tweezer for nanoparticle trapping
Applied Physics A, 2016
Integrated optical nanotweezers offer a novel paradigm for optical trapping, as their ability to confine light at the nanoscale leads to extremely high gradient forces. To date, nanotweezers have been realised either as photonic crystal or as plasmonic nanocavities. Here, we propose a nanotweezer device based on a hybrid photonic/plasmonic cavity with the goal of achieving a very high Quality factor over mode volume (Q/V) ratio. The structure includes a 1D photonic crystal (PhC) dielectric cavity vertically coupled to a bowtie nanoantenna. A very-high Q/V ~ 10 7 (λ/n) -3 with a resonance transmission T = 29% at λ R = 1381.1 nm has been calculated by 3D Finite Element Method (FEM), affording strong light-matter interaction and making the hybrid cavity suitable for optical trapping. A maximum optical force F = -4.4 pN, high values of stability S = 30 and optical stiffness k = 90 pN/nm•W have been obtained with an input power P in = 1 mW, for a polystyrene nanoparticle with a diameter of 40 nm. This performance confirms the high efficiency of the optical nanotweezer and its potential for trapping living matter at the nanoscale, such as viruses, proteins or small bacteria.
Physical Review A, 2019
The motion of neutral, polarizable atoms (also called neutral particles in this work) in the field of the Bessel beam is considered. It is shown in the numerical way, that the Bessel rings, i.e., the regions of high energy concentration can trap particles of positive polarizability (atoms in reddetuned beams). This trapping occurs only in the plane perpendicular to the wave propagation, and the motion along the beam is unrestricted. When the beam is superposed with the plane wave of the same frequency propagating in the same direction, the particles are guided along helices, fixed in space. The shape of these helices depends on the parameters characterizing the electromagnetic fields but not on the initial state of guided particles. Depending on the vorticity of the Bessel beam, these helices can be made left or right-handed. In the special case of zero vorticity, the helices get degenerated to the true, three-dimensional rings, which can serve as 3D traps. The emerging structure of potential valleys can be applied to parallel guidance or capture several independent atoms, each in its own trap.
Trapping of rare earth-doped nanorods using quasi Bessel beam optical fiber tweezers
OSA Continuum, 2021
We demonstrate optical trapping of rare earth-doped NaYF4:Er/Yb nanorods of high aspect ratio (length 1.47 μm and diameter 140 nm) using a quasi Bessel beam (QBB) generated by positive axicon optical fiber tips. Propulsion or trapping of the nanorods is demonstrated using either single or dual fiber nano-tip geometries. The optical force exerted on the trapped nanorods, their velocities, and their positions have been analyzed. We determine the trap stiffness for a single nanorod to be 0.12 pN/μm (0.003 pN/μm) by power spectrum analysis and 0.13 pN/μm (0.015 pN/μm) by Boltzmann statistics in the direction perpendicular to (along) the fiber axes for an average optical power of 34 mW. The experiments illustrate the advantage of using a QBB for multiple nanorod trapping over a large distance of up to 30 μm.
Single-beam trapping of micro-beads in polarized light: Numerical simulations
Optics express, 2006
Using numerical solutions of Maxwell's equations in conjunction with the Lorentz law of force, we compute the electromagnetic force distribution in and around a dielectric micro-sphere trapped by a focused laser beam. Dependence of the optical trap's stiffness on the polarization state of the incident beam is analyzed for particles suspended in air or immersed in water, under conditions similar to those realized in practical optical tweezers. A comparison of the simulation results with available experimental data reveals the merit of one physical model relative to two competing models; the three models arise from different interpretations of the same physical picture.
Non-diffracting beams from surface-emitting lasers
2012
We present an overview of recent advances in generation of non-diffracting (Bessel) beams from surface-emitting lasers, such as electrically and optically pumped VECSELs, and discuss their applications in optical trapping/tweezing and manipulation of micromachines. Our experiments on VECSEL-generated watt power level Bessel beams with central lobe diameters of a few to tens micrometers suggest that the semiconductor surface-emitting lasers are the best candidates for replacement of gas and solid-state counterparts for power-demanding applications in optical manipulation. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 05/23/2013 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8242 82420T-2 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 05/23/2013 Terms of Use: http://spiedl.org/terms
Trapping of charged particles by Bessel beams
2011
There exist two well established methods to trap charged particles: the Penning trap and the Paul trap. The subject of this article is to present a third mechanism for trapping charged particles - trapping by beams of electromagnetic radiation. The essential role is played by the electric field configuration in the plane perpendicular to the beam axis (for nonrelativistic electrons, the magnetic field is less important). Particles are confined to the vicinity of the minimum-energy points. In particular, for beams of electromagnetic radiation carrying orbital angular momentum such points lie on the beam axis.
Ultrafast Bessel beams: advanced tools for laser materials processing
Advanced Optical Technologies, 2018
Ultrafast Bessel beams demonstrate a significant capacity of structuring transparent materials with a high degree of accuracy and exceptional aspect ratio. The ability to localize energy on the nanometer scale (bypassing the 100-nm milestone) makes them ideal tools for advanced laser nanoscale processing on surfaces and in the bulk. This allows to generate and combine micron and nano-sized features into hybrid structures that show novel functionalities. Their high aspect ratio and the accurate location can equally drive an efficient material modification and processing strategy on large dimensions. We review, here, the main concepts of generating and using Bessel non-diffractive beams and their remarkable features, discuss general characteristics of their interaction with matter in ablation and material modification regimes, and advocate their use for obtaining hybrid micro and nanoscale structures in two and three dimensions (2D and 3D) performing complex functions. High-throughput...
Nanostructure-enhanced laser tweezers for efficient trapping and alignment of particles
Optics Express, 2010
We propose and demonstrate a purely optical approach to trap and align particles using the interaction of polarized light with periodic nanostructures to generate enhanced trapping force. With a weakly focused laser beam, we observed efficient trapping and transportation of polystyrene beads with sizes ranging from 10 µm down to 190 nm as well as cancer cell nuclei. In addition, alignment of non-spherical dielectric particles to a 1-D periodic nanostructure was achieved with low laser intensity without attachment to birefringent crystals. Bacterial cells were trapped and aligned with incident optical intensity as low as 17 µW/µm 2 .
Optics Express, 2010
Gradient forces on double negative (DNG) spherical dielectric particles are theoretically evaluated for v-th Bessel beams supposing geometrical optics approximations based on momentum transfer. For the first time in the literature, comparisons between these forces for double positive (DPS) and DNG particles are reported. We conclude that, contrary to the conventional case of positive refractive index, the gradient forces acting on a DNG particle may not reverse sign when the relative refractive index n goes from |n| > 1 to |n| < 1, thus revealing new and interesting trapping properties.