光学微机械建模
Modelling optical micro-machines
摘要：
强聚焦激光束可用于捕获、操纵微粒并在微粒上施加扭矩。扭矩是通过激光束的散射传递角动量的结果。激光器可以用来驱动转子、叶轮、齿轮或其他几微米大小的微型装置，这些装置可能由双折射材料制成。我们回顾我们的方法计算模拟的扭矩和力所赋予的激光束。我们介绍了一种方法的杂交T-矩阵的有限差分频域（FDFD）的方法，允许建模的材料是各向异性和不均匀的，和结构，具有复杂的形状。微型转子的高度对称性，例如离散或连续的旋转对称性，可以用来减少计算时间和存储器需求的数量级。这是通过仅对整个结构中重复的给定段或平面执行计算来实现的。这可以通过模拟立方体的光学捕获和旋转来证明。
英文摘要：
A strongly focused laser beam can be used to trap, manipulate and exert torque on a microparticle. The torque is the result of transfer of angular momentum by scattering of the laser beam. The laser could be used to drive a rotor, impeller, cog wheel or some other microdevice of a few microns in size, perhaps fabricated from a birefringent material. We review our methods of computationally simulating the torque and force imparted by a laser beam. We introduce a method of hybridizing the T-matrix with the Finite Difference Frequency Domain (FDFD) method to allow the modelling of materials that are anisotropic and inhomogeneous, and structures that have complex shapes. The high degree of symmetry of a microrotor, such as discrete or continuous rotational symmetry, can be exploited to reduce computational time and memory requirements by orders of magnitude. This is achieved by performing calculations for only a given segment or plane that is repeated across the whole structure. This can be demonstrated by modelling the optical trapping and rotation of a cube.
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