Shen Tingting, Lang Tingting, Wu Mengru, Han Zhanghua
Appl Opt. 2018 Jul 20;57(21):6174-6180. doi: 10.1364/AO.57.006174.
The axicon is the simplest and most effective optical element for generating the zero-order Bessel-like beam. The zero-order Bessel-like beam, which has the characteristics of small spot size, high brightness, good direction, and large collimation distance, can be applied to optical micromanipulation and power transmission. In this paper, we proposed and designed a structure for phase manipulation based on parallel-plate waveguides that can be used to realize the functionality of the axicon in the terahertz (THz) region. Meanwhile, we characterized the influence of the cone angle of the axicon and the waist radius of the incident Gaussian beam on the generated zero-order Bessel-like beam by simulation. The planar structure, consisting of a parallel stack of thin copper plates, can be easily fabricated to fulfill the phase requirement to realize the zero-order Bessel-like beam and also can be utilized in THz imaging systems, THz sensing systems, THz communication systems, etc.
轴棱锥是产生零阶类贝塞尔光束最简单且最有效的光学元件。零阶类贝塞尔光束具有光斑尺寸小、亮度高、方向性好以及准直距离大等特点，可应用于光学微操纵和功率传输。在本文中，我们提出并设计了一种基于平行板波导的相位操纵结构，该结构可用于在太赫兹（THz）波段实现轴棱锥的功能。同时，我们通过仿真研究了轴棱锥的锥角和入射高斯光束的束腰半径对所产生的零阶类贝塞尔光束的影响。这种由平行堆叠的薄铜板组成的平面结构易于制造，能够满足实现零阶类贝塞尔光束的相位要求，并且还可应用于太赫兹成像系统、太赫兹传感系统、太赫兹通信系统等。
