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Optimization of torque on an optically driven micromotor by manipulation of the index of refraction

机译：通过控制折射率来优化光驱微电机上的扭矩

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Since the 1970's, the focused laser beam has become a familiar tool to manipulate neutral, dielectric micro-objects. A number of authors, including Higurashi and Gauthier, have described the effects of radiation pressure from laser light on microrotors. Collett, et al. developed a wave, rather than a ray optic, approach in the calculation of such forces on a microrotor for the first time. This paper describes a modification to the design of a laser driven, radiation pressure microrotor, intended to improve the optically generated torque. Employing the wave approach, the electric and magnetic fields in the vicinity of the rotor are calculated using the finite difference time domain (FDTD) method, which takes into account the wave nature of the incident light. Forces are calculated from the application of Maxwell's stress tensor over the surfaces of the rotor. Results indicate a significant increase in torque when the index of refraction of the microrotor is changed from a single value to an inhomogeneous profile. The optical fiber industry has successfully employed a variation in the index of refraction across the cross section of a fiber for the purpose of increasing the efficiency of light transmission. Therefore, it is hoped that various fabrication methods can be utilized for causing desired changes in the index of refraction of an optically driven microrotor. Various profiles of the index of refraction inside a microrotor are considered for optimization of torque. Simulation methodology and results of torque on a microrotor for various profiles of the index of refraction are presented. Guidelines for improvised fabrication of efficient microrotors may then be obtained from these profiles.
机译：自1970年代以来，聚焦激光束已成为操纵中性，介电微物体的熟悉工具。包括Higurashi和Gauthier在内的许多作者已经描述了激光辐射压力对微转子的影响。 Collett等。首次开发了一种波而不是射线光学的方法来计算这种作用在微转子上的力。本文描述了一种激光驱动辐射压力微转子设计的改进方案，旨在提高光学产生的扭矩。采用波方法，使用有限时差时域（FDTD）方法计算转子附近的电场和磁场，该方法考虑了入射光的波特性。力是通过在转子表面上施加麦克斯韦应力张量来计算的。结果表明，当微转子的折射率从单个值更改为不均匀轮廓时，扭矩会显着增加。为了提高光传输的效率，光纤工业已经成功地采用了光纤横截面的折射率变化。因此，希望可以使用各种制造方法来引起光驱动微转子的折射率的期望变化。为了优化扭矩，考虑了微转子内部的各种折射率分布。给出了针对各种折射率分布的微转子上的转矩仿真方法和结果。然后，可以从这些配置文件中获得高效微转子简易制造的指南。

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