【摘要】 提出了一种新型的光学元件，可以产生与元件具有一定距离的无衍射波束。普通轴棱锥的横截面为等腰三角形，通过在两个腰上限定抛物线进行元件设计，采用3D打印技术制作了不同结构参数的光学元件。角谱理论的仿真计算结果以及在0.1 THz频率下进行的实验结果，都清晰地表明了产生的无衍射波束与元件之间具有一定距离。利用空间频谱对元件的波束行为进行分析，结果表明，该元件产生了一种新型的无衍射波束，根据元件的空频形状，将元件产生的无衍射波束命名为“梳状空频无衍射波束”。更多还原

【Abstract】 A new optical element was proposed, which could generate a diffraction-free beam with a certain distance from the element. The cross section of an ordinary axial pyramid was an isosceles triangle and the element was designed by defining a parabola on the two waists. The 3D printing technology was used to fabricate optical elements with different structures. The results of simulation calculation using angular spectrum theory and the experiment conducted at 0.1 THz frequency clearly show that there is a certain distance between the generated diffraction-free beam and the element. The beam behavior of the element was analyzed according to the spatial frequency spectrum. The results show that the element generates a new type of diffraction-free beam, and according to the space-frequency shape of the element, the diffraction-free beam generated by the element is named comb-like space-frequency diffraction-free beam.更多还原