Optical trapping and magnetic trapping are common micro-manipulation techniques for controlling colloids including micro- and nano-particles. Combining these two manipulation strategies allows for a larger range of applied forces and decoupled control of rotation and translation; each of which are beneficial properties for many applications including force spectroscopy and advanced manufacturing. However, optical trapping and magnetic trapping have conflicting material requirements inhibiting the combination of these methodologies. In this paper, anisotropic micron scaled particles capable of being simultaneously controlled by optical and magnetic trapping are synthesized using a glancing angle deposition (GLAD) technique. The anisotropic alignment of dielectric and ferromagnetic materials limits the optical scattering from the metallic components which typically prevents stable optical trapping in three dimensions. Compared to the current state of the art, the benefits of this approach are two-fold. First, the composite structure allows for larger volumes of ferromagnetic material so that larger magnetic moments may be applied without inhibiting the stability of optical trapping. Secondly, the robustness of the synthesis process is greatly improved. The dual optical and magnetic functionality of the synthesized colloids is demonstrated by simultaneously optically translating and magnetically rotating a magnetic GLAD particle using a custom designed opto-magnetic trapping system.

中文翻译：

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采用掠射角沉积法制造的光磁控制微粒

光捕获和磁捕获是用于控制胶体（包括微米和纳米颗粒）的常见微操纵技术。结合这两种操纵策略可以实现更大范围的施加力以及旋转和平移的解耦控制；每一个特性对于包括力谱和先进制造在内的许多应用都是有益的。然而，光捕获和磁捕获具有相互冲突的材料要求，阻碍了这些方法的组合。在本文中，利用掠射角沉积（GLAD）技术合成了能够同时受光学和磁捕获控制的各向异性微米级粒子。介电材料和铁磁材料的各向异性排列限制了金属部件的光学散射，这通常会阻止三维空间中的稳定光学捕获。与当前的技术水平相比，这种方法的好处有两个。首先，复合结构允许使用更大体积的铁磁材料，从而可以施加更大的磁矩而不抑制光捕获的稳定性。其次，合成过程的稳健性大大提高。通过使用定制设计的光磁捕获系统同时光学平移和磁性旋转磁性 GLAD 颗粒，证明了合成胶体的双重光学和磁性功能。