斐波那契波带片(FiZP)在焦平面上有两个不同的主焦点且具有独特的自恢复特性,因此FiZP光束能够在不同平面同时捕获微粒,同时对微粒实现焦平面上的自由移动。仿真分析了FiZP的构成与轴向强度,利用液晶空间光调制器、倒置光学显微镜以及光学元件组合搭建实验平台,对微粒进行三维捕获。实验验证了FiZP光束具有三维光学捕获特性,并可用于构建三维光镊,实现复杂的捕获功能。

Fibonacci zone plate (FiZP), with properties of bi-foci in focal plane and self-reconstruction, can simultaneously trap particles positioned in two different planes and move particles freely in the focal plane. The structure and axial strength of FiZP are analyzed. The experimental platform is established by combination of liquid crystal spatial light modulator, inverted optical microscope and optical elements, and used to capture particles in three dimensions. Experiments show that the FiZP beam has three-dimensional optical acquisition characteristics, and can be used to build three-dimensional optical tweezers and achieve complex capture function.