Abstract
This article describes a novel optical tweezer system which utilizes a magnetic fluid deformable mirror (MFDM) with a wavefront sensor (WFS) and controller to produce a curved Bessel beam for manipulating an optically trapped microparticle. The MFDM is proposed to control the wavefront phase of the laser beam since it offers the ability to produce a nearly perfect axicon in reflection. The working principle of the MFDM and its modeling and design processes are introduced. A decentralized control method is presented for the MFDM to generate the desired mirror surface shape, combing an axicon and an adjustable compensation phase profile that transforms the incident beam into a self-accelerating Bessel-like beam with curved trajectory. Using a prototype MFDM, an experimental optical tweezer system is set up to verify this optical micromanipulation method. The experimental results show the effectiveness of the proposed technique for the manipulation of optically trapped microparticles.
Highlights
In early 1970s, Ashkin found that a transparent microsphere remained stably held in three dimensions at the focal point of the laser [1]
We show that it is possible to bend the trajectory of Bessel beams for optical trapping by using a magnetic fluid deformable mirror (MFDM)
Experimental Results a prototype optical tweezer system based on MFDM is set up to conceptually verify the proposed optical micromanipulation method
Summary
In early 1970s, Ashkin found that a transparent microsphere remained stably held in three dimensions at the focal point of the laser [1]. Despite availability of a wide array of beam-transformation methodologies such as the non-diffraction beams (Airy beams, hollow beams, Bessel beams), technological implementation of optical tweezers remains challenging They utilize various laser beam shaping devices for optical trapping such as prisms [11], liquid crystal spatial light modulators (LC-SLM) [12], digital micro-mirror devices [13], VOLUME XX, 2017. This article describes a novel method for shaping laser beam and moving the location of the trap by using a magnetic fluid deformable mirror (MFDM). The optical tweezer based on MFDM beam control system can generate self-accelerating Bessel-like beam to trap and manipulate particles allowing the microscope objective of the OT system to be used for observation only [11]. The experimental apparatus specially designed and constructed for the generation of the Bessel-like beam with parabolic propagation is demonstrated to trap and manipulate microparticles
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