论文标题
基于聚焦梁的单光束声学镊子：2D和3D诱捕能力的数值分析
Single beam acoustical tweezers based on focused beams: A numerical analysis of 2D and 3D trapping capabilities
论文作者
论文摘要
选择性的单光束镊子在微型流体和微生物学上开辟了巨大的观点，用于微观流体，组装和机械性能测试微粒，细胞和微生物。在光学元件中，单光束光学镊子依赖于紧密聚焦的激光束，在焦点处产生三维（3D）陷阱。在声学中，仅通过称为声学涡旋的特定波场在实验上进行了3D陷阱。实际上，许多类型的颗粒被聚焦光束的中心排出（不吸引）。然而，仅部分探索了聚焦梁的捕获功能。在本文中，我们使用角光谱代码进行数值探索，将聚焦光束的捕获功能（超过波长比和粒子类型）上的焦点梁的捕获功能。我们证明（i）表明，在雷利（Rayleigh）方向（例如聚二甲基硅氧烷，橄榄油，苯和脂质球体和脂质球）和（ii）（ii）（无需轴向反对因素）中，粒子，橄榄油，苯和脂质球）的3D诱捕比周围的流体更容易压缩。
Selective single beam tweezers open tremendous perspectives in microfluidics and microbiology for the micromanipulation, assembly and mechanical properties testing of microparticles, cells and microorganisms. In optics, single beam optical tweezers rely on tightly focused laser beams, generating a three-dimensional (3D) trap at the focal point. In acoustics, 3D traps have so-far only been reported experimentally with specific wavefields called acoustical vortices. Indeed, many types of particles are expelled (not attracted to) the center of a focused beam. Yet the trapping capabilities of focused beams have so-far only been partially explored. In this paper, we explore numerically with an angular spectrum code the trapping capabilities of focused beams on a wide range of parameters (size over wavelength ratio and type of particles). We demonstrate (i) that 3D trapping of particles, droplets and microorganisms more compressible than the surrounding fluid is possible in and beyond Rayleigh regime (e.g. polydimethylsiloxane, olive oil, benzene, and lipid sphere) and (ii) that 2D trapping (without axial trap) of particles with positive contrast factor can be achieved by using the particles resonances.
