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Unconventional circularly polarized Airy light-sheet spinner tweezers
Journal of the Optical Society of America A ( IF 1.9 ) Pub Date : 2021-03-11 , DOI: 10.1364/josaa.418743
F. G. Mitri

Standard circularly polarized Airy light-sheets are synthesized by combining two dephased TE and TM wave fields, polarized in the transverse directions of wave propagation, respectively. Somewhat counterintuitively, the present analysis theoretically demonstrates the existence of unconventional circularly polarized Airy light-sheets, where one of the individual dephased wave fields is polarized along the direction of wave propagation. The vector angular spectrum decomposition method in conjunction with the Lorenz gauge condition and Maxwell’s equations allow adequate determination of the Cartesian components of the incident radiated electric field components. Subsequently, the Cartesian components of the optical time-averaged radiation force and torque can be determined and computed. The example of a subwavelength light-absorptive (lossy) dielectric sphere is considered based upon the dipole approximation method. The results demonstrate the emergence of negative force components, suggesting retrograde motion and spinning reversal depending on the polarization of the Airy light-sheet and its transverse scale and attenuation parameter. The results are important in the design of light-sheet spinner tweezers and applications involving optical switching and particle manipulation and rotation.

中文翻译:

非常规圆偏振Airy光片微调镊子

通过组合两个分别在波传播的横向方向上极化的TE和TM波场,合成了标准的圆偏振Airy光学片。有点违反直觉的是,本分析从理论上证明了非常规圆偏振艾里光片的存在,其中,单个相移波场之一沿波传播方向偏振。矢量角谱分解方法结合洛伦兹规范条件和麦克斯韦方程,可以充分确定入射辐射电场分量的笛卡尔分量。随后,可以确定和计算光学时间平均辐射力和扭矩的笛卡尔分量。基于偶极近似法,考虑亚波长吸光(有损)电介质球的示例。结果表明负力分量的出现,表明逆行运动和旋转反转取决于艾里光片的偏振及其横向尺度和衰减参数。结果对于光片微调镊子的设计和涉及光学开关以及粒子操纵和旋转的应用非常重要。
更新日期:2021-04-01
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