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光学微操控技术已从颗粒的捕获和传输拓展到颗粒的分选和导向等更高级的逻辑操控,硅基光镊技术因能突破衍射极限并操控亚微米量级的颗粒而成为了微操控领域中最重要的手段之一。传统的硅基光镊技术一般采用微环、定向耦合器和多模干涉仪等器件,通过调节波长实现颗粒导向操作。文章提出了一种通过偏振调控的硅基颗粒导向操作方法,通过时域有限差分设计和优化了系统结构参数,并验证了该结构在颗粒导向操作中的可行性。实验装置结构简单、体积小巧,且操控更加方便。
Optical micromanipulation techniques have expanded from capturing and transporting particles to more advanced logic manipulations such as particle sorting and orientation. Silicon-based optical tweezers technology has become a field of micromanipulation because of its ability to break through diffraction limits and manipulate particles on the order of submicrometers In one of the most important means. The traditional silicon-based optical tweezers technology generally use micro-ring, directional coupler and multimode interferometer and other devices, through the regulation of wavelength particle-oriented operation. In this paper, a polarization-controlled silicon-based particle steering method is proposed. The finite difference of the time domain is used to design and optimize the structural parameters of the system. The feasibility of this structure in particle-oriented operation is also verified. The experimental device has the advantages of simple structure, small size, and more convenient operation.