Kotnala Abhay, Kollipara Pavana Siddhartha, Zheng Yuebing
Walker Department of Mechanical Engineering, Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA.
Nanophotonics. 2020 Apr;9(4):927-933. doi: 10.1515/nanoph-2019-0530. Epub 2020 Mar 7.
Opto-thermoelectric tweezers present a new paradigm for optical trapping and manipulation of particles using low-power and simple optics. New real-life applications of opto-thermoelectric tweezers in areas such as biophysics, microfluidics, and nanomanufacturing will require them to have large-scale and high-throughput manipulation capabilities in complex environments. Here, we present opto-thermoelectric speckle tweezers, which use speckle field consisting of many randomly distributed thermal hotspots that arise from an optical speckle pattern to trap multiple particles over large areas. By further integrating the speckle tweezers with a microfluidic system, we experimentally demonstrate their application for size-based nanoparticle filtration. With their low-power operation, simplicity, and versatility, opto-thermoelectric speckle tweezers will broaden the applications of optical manipulation techniques.
光热电镊子为使用低功率和简单光学器件进行粒子的光学捕获和操纵提供了一种新范式。光热电镊子在生物物理学、微流体和纳米制造等领域的新实际应用将要求它们在复杂环境中具备大规模和高通量的操纵能力。在此，我们展示了光热电散斑镊子，它利用由光学散斑图案产生的许多随机分布的热热点组成的散斑场在大面积上捕获多个粒子。通过将散斑镊子与微流体系统进一步集成，我们通过实验证明了它们在基于尺寸的纳米颗粒过滤中的应用。凭借其低功率操作、简单性和多功能性，光热电散斑镊子将拓宽光学操纵技术的应用范围。
