携带新型幂指数涡旋相位的径向偏振自聚焦Airy光束在紧聚焦下的多微粒捕获  

Multi-Particle Capture in Tight Focus with Radially Polarized Autofocusing Airy Beam Carrying New Kind of Power-Exponent-Phase Vortex

作　　者：周晓鸣 王海涛 张京会 乔春红 范承玉 Zhou Xiaoming;Wang Haitao;Zhang Jinghui;Qiao Chunhong;Fan Chengyu(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,Anhui,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,Anhui,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所中国科学院大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230026 [3]先进激光技术安徽省实验室,安徽合肥230037

出　　处：《光学学报》2024年第14期277-287,共11页Acta Optica Sinica

基　　金：173重点基础研究项目(2022-JCJQ-ZD-166);中科院装备预研基项目(614A010717);先进激光技术安徽省实验室主任基金(AHL 2021ZR06);中国科学院重点实验室基金(CXJJ-225028)。

摘　　要：基于Richards-Wolf矢量衍射积分理论,研究携带新型幂指数涡旋相位的径向偏振自聚焦Airy光束通过高数值孔径物镜后的紧聚焦特性,分析聚焦场的光斑强度、相位的分布特点。结果表明,改变拓扑荷数、幂指数,可以获得包括高斯状、圆形蜂窝状多暗核和带有焦点的同心圆状等多种形状的焦斑分布。此外基于瑞利散射理论,计算对两种不同类型粒子(微气泡、金属微粒)的辐射力(梯度力、散射力、吸收力),分析其三维捕获的可能性。最终进一步模拟同时三维稳定捕获4个微气泡的条件。Objective In the practical realm of optical manipulation, the particles targeted for manipulation often deviate from conventional silica or polystyrene microspheres, which poses challenges due to their varying refractive indices. These particles range from those with refractive indices below the surrounding medium to those with high refractive indices.Traditionally, capturing microspheres with low or high indices relies on adjusting laser coherence or employing amplitude modulation. However, these methods lack dynamic modulation capabilities crucial for practical applications. With the advancement of spatial optical modulators in recent years, phase modulation has emerged as a more flexible option,holding promise for capturing microspheres with high and low refractive indices. Despite this, existing approaches such as coherence or phase modulation only permit the capture of a single microsphere with a single laser beam, limiting their efficacy in scenarios necessitating the simultaneous capture of multiple low refractive index particles. Thus, we propose a novel method for achieving stable capture of particles with differing refractive indices utilizing a radially polarized autofocusing Airy beam(AAB) endowed with a new kind of power-exponent-phase vortex(NPEPV). This beam can both facilitate the stable capture of high refractive index particles and concurrently enable the capture of multiple low refractive index particles with a single laser beam. The radially polarized AAB with its distinctive power-exponent-phase vortex not only demonstrates the capability to capture multiple particles but also exhibits superior capture power compared to conventional power-index vortex-phase-modulated beams at equivalent power levels. The enhanced capture power augments the effectiveness of optical manipulation processes. Our findings contribute to advancing the methodology and leading to the domain of multi-particle optical capture, potentially enhancing the capabilities of optical manipulation systems.Methods Optical trappin

关 键 词：物理光学 幂指数涡旋相位 自聚焦Airy光束 多微粒光捕获 微气泡 

分 类 号：O436[机械工程—光学工程]