Yu Junjie, Zhou Changhe, Jia Wei, Cao Wugang, Wang Shaoqing, Ma Jianyong, Cao Hongchao
Lab of Information Optics and Optoelectronics Techniques, Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, China.
Appl Opt. 2012 Apr 1;51(10):1619-30. doi: 10.1364/AO.51.001619.
We demonstrate a scheme that can produce a three-dimensional (3D) focus spot array in a 3D lattice structure, called a 3D Dammann array, in focal region of an objective. This 3D Dammann array is generated by using two separate micro-optical elements, a Dammann zone plate (DZP) that produces a series of coaxial focus spots and a conventional two-dimensional (2D) Dammann grating (DG). A simple, fast, and clear method is presented to design this binary pure-phase (0,π) DZP in vectorial Debye theory regime. Based on this kind of DZP, one can always obtain a 3D Dammann array both for low and high numerical aperture (NA) focusing objectives. For experimental demonstration, an arrangement combining a DZP, a 2D DG, and a pair of opposing lenses is proposed to generate a 5×5×5 Dammann array in focal region of an objective with NA=0.127 and another 6×6×7 Dammann array for an objective of NA=0.66. It is shown that this arrangement makes it possible to achieve 3D Dammann arrays with micrometer-sized focus spots and focus spacings of tens of micrometers for various practical applications, such as 3D parallel micro- and nanomachining, 3D simultaneous optical manipulation, 3D optical data storage, and multifocal fluorescence microscope, etc.
我们展示了一种方案，该方案可以在物镜的焦区内产生一种三维（3D）晶格结构的聚焦光斑阵列，称为三维达曼阵列。这种三维达曼阵列是通过使用两个独立的微光学元件产生的，一个是产生一系列同轴聚焦光斑的达曼波带片（DZP），另一个是传统的二维（2D）达曼光栅（DG）。在矢量德拜理论框架下，提出了一种简单、快速且清晰的方法来设计这种二元纯相位（0,π）DZP。基于这种DZP，对于低数值孔径（NA）和高数值孔径聚焦物镜，都总能获得三维达曼阵列。为了进行实验演示，提出了一种将DZP、2D DG和一对相对透镜组合的装置，以在数值孔径NA = 0.127的物镜焦区内产生一个5×5×5的达曼阵列，并为数值孔径NA = 0.66的物镜产生另一个6×6×7的达曼阵列。结果表明，这种装置能够实现具有微米级聚焦光斑和几十微米聚焦间距的三维达曼阵列，可用于各种实际应用，如三维并行微纳加工、三维同步光学操纵、三维光学数据存储以及多焦点荧光显微镜等。
