用复合微球调整光学拉力
Tailoring optical pulling forces with composite microspheres
摘要：
光学拉力或牵引光束可以通过将入射光子向前重定向来拉动粒子抵抗光传播。这通常使用具有非常小的半锥角的贝塞尔光束来实现，这大大限制了其适用性。人们可以通过使用平面波的叠加来规避这样的问题。为了研究非共线平面波对所产生的光学拉力，我们建立了一个基于Mie理论、德拜势和Wigner旋转矩阵的理论框架。我们应用这个框架来计算金属-介电复合粒子上的光学拉力，我们提出作为一个替代材料平台来优化和定制牵引光束。事实上，我们证明，通过添加一些等离子体夹杂物的任意大小的低折射率的电介质颗粒，我们能够产生偏振依赖的光学拉力，不能发生在相应的均匀粒子。总之，我们的研究结果不仅提供了创新的理论方法来计算光学拉力，而且还提供了新的策略来定制和优化它们，为提高其适用性铺平了道路。
英文摘要：
Optical pulling forces or tractor beams can pull particles against light propagation by redirecting the incident photons forward. This is typically achieved using Bessel beams with very small half-cone angles, which considerably limits its applicability. One can circumvent such issue by using a superposition of plane waves. In order to investigate optical pulling forces exerted by a pair of non-colinear plane waves, we develop a theoretical framework based on Mie theory, Debye potentials and Wigner rotation matrices. We apply this framework to calculate the optical pulling force on metallo-dielectric composite particles, which we put forward as an alternative material platform to optimize and tailor tractor beams. Indeed we demonstrate that by adding a few plasmonic inclusions to low-refractive index dielectric particles of arbitrary sizes, we are able to produce polarization dependent optical pulling forces that cannot occur in the corresponding homogeneous particles. Altogether our findings not only provide innovative theoretical methods to compute optical pulling forces, but also provide new strategies to tailor and optimize them, paving the way to increase their applicability.
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