Optical trapping forces of focused circular partially coherent beams on Rayleigh particles

IF 0.7 4区 物理与天体物理 Q4 OPTICS
Optica Applicata Pub Date : 2022-01-01 DOI:10.37190/oa220408
Chaoqun Yu, Fuchang Chen, Jun Zeng, Cheng Huang, Zhimin He, Huichuan Lin, Yongtao Zhang, Ziyang Chen, Jixiong Pu
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引用次数: 0

Abstract

The optical trapping forces of tightly-focused radially polarized circular partially coherent beams on Rayleigh particles are theoretically investigated. Numerical calculations are performed to study the optical trapping forces on Rayleigh particles for different initial coherent length of the incident circular partially coherent beams. The results show that the magnitude of the gradient force decreases with the reduction of the initial coherent length of the focused radially polarized circular partially coherent beams, while the balanced position (i.e., the position where the optical trapping forces becomes zero) stays constant. Moreover, the focused spot gradually elongates along the optical axis with the reduction of the initial coherent length, and the axial gradient force on Rayleigh particles also decreases gradually with the reduction of the intensity gradient in axial direction. As there exists an spherical aberrant in the focusing optical system, the focal spot in the direction of the optical axis becomes trumpet-shaped, and the optical trapping forces on Rayleigh particles change as well.
聚焦圆形部分相干光束对瑞利粒子的光俘获力
从理论上研究了紧聚焦径向偏振圆形部分相干光束对瑞利粒子的光俘获力。通过数值计算研究了不同初始相干长度入射圆形部分相干光束对瑞利粒子的光俘获力。结果表明,梯度力的大小随着聚焦径向偏振圆部分相干光束初始相干长度的减小而减小,而平衡位置(即光捕获力变为零的位置)保持不变。随着初始相干长度的减小,聚焦光斑沿光轴方向逐渐拉长,作用在瑞利粒子上的轴向梯度力也随着轴向强度梯度的减小而逐渐减小。由于聚焦光学系统中存在球差,使得光轴方向的焦斑呈喇叭状,瑞利粒子的光捕获力也发生了变化。
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来源期刊
Optica Applicata
Optica Applicata 物理-光学
CiteScore
1.00
自引率
16.70%
发文量
21
审稿时长
4 months
期刊介绍: Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.
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