Trapping and Sorting Micro-Nano Particles in a Dynamic Optical Sieve

Jian Chen,Kaiqing Luo,Jian Qiu,Li Peng,Dongmei Liu,Peng Han

doi:10.1109/jphot.2022.3149282

Abstract

We propose a novel strategy for optical trapping and sorting of micro-nano particles that does not involve the flow of the immersion medium. The method employs the size- and velocity-dependent response of suspended polystyrene particles to the optical sieve of a dynamic fringelike pattern generated by a spatial light modulator. We not only experimentally demonstrate the trapping and transport of polystyrene particles with 2 μm diameter, but also study the sorting of a polydisperse suspension of polystyrene beads with diameters of 0.8 and 2 μm. The results provide new insights into particle manipulation and separation, and reveal that there is still scope for sorting smaller particles based on dynamic optical sieve.

Highlights

PRECISE manipulation of micro- and nano-objects has been attracting increasing attention in recent years, because of the increasing number of applications, such as nanofabrication [1], [2], disease diagnostics [3], [4], drug delivery [5], [6], and bioanalysis[7], [8], [9]
We demonstrate an optical micromanipulation system, i.e. dynamic optical sieve, to achieve flexibility and high throughput by exploiting the sizes and velocities of the optical landscapes generated from a spatial light modulator (SLM)
Particles Directional Movement we investigated the transport behavior of polystyrene particles based on a dynamic fringe optical field with a laser power of 40 mW

Summary

INTRODUCTION

PRECISE manipulation of micro- and nano-objects has been attracting increasing attention in recent years, because of the increasing number of applications, such as nanofabrication [1], [2], disease diagnostics [3], [4], drug delivery [5], [6], and bioanalysis[7], [8], [9]. Several approaches have been developed to produce complex patterns [10], assembled arrays [11], modulated structures [12], [13], self-driven micro-bots [14], [15], and artificial cilia [16],[17], [18] These approaches use many diverse technologies including hydrodynamic, magnetic, optical, acoustic, and electrical fields. To the best of our knowledge, few experiments using dynamically optical landscapes have been reported [25], [26] In most of these researches, the performance of the generated optical landscape, such as its pattern, size, and moving velocity, are fixed in the devices. The few tunable methods require certain complicated mechanisms, such as the interference of multi-beams [27], [28], [29]

BASIC PRINCIPLE

EXPERIMENTAL SETUP

Optical Trapping

Optical Sorting The sorting capabilities of our method are demonstrated in

CONCLUSION