探测拓扑电荷的超构透镜

IF 1 Q4 OPTICS
A. Nalimov, V. Kotlyar, S. Stafeev, E. S. Kozlova
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引用次数: 0

摘要

在本文中,我们考虑了具有高数值孔径的复杂金属透镜的设计。它被提议在氮化硅薄膜中制造。该元件代表两个倾斜的扇形金属透镜,每个扇形都是二元亚波长光栅组。所提出的透镜直径为14µm。通过应用时域有限差分方法进行的数值建模表明,所提出的单元能够检测到具有不同拓扑电荷-2和-1的激光涡旋光束。此外,它可以在整个可见光范围内工作。所提出的金属透镜能够辨别具有不同波长的光束,因为它们聚焦在不同的焦平面中。波长在1nm内的变化产生焦斑在约4nm内的偏移。在具有左圆偏振的高斯入射光束的情况下,该金属透镜在6μm的焦距处同时形成具有拓扑电荷一和二的两个涡旋光束。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Metalens for Detection of a Topological Charge

Metalens for Detection of a Topological Charge

In this paper, we considered design of the complex metalens with high numerical aperture. It proposed to be manufactured in a thin film of silicon nitride. The element represents two slanted sectored metalenses, every sector of which is binary sub-wavelength gratings set. The diameter of the proposed lens is 14 µm. Numerical modelling by applying the finite difference time-domain method demonstrated that the proposed element was able to detect laser vortex beams with different topological charges –2 and –1. Moreover, it can operate over the whole visible range of light. The proposed metalens is able to discern beams with different wavelengths since they are focused in different focal planes. The change of wavelength in a 1 nm produces the shift of focal spot in about 4 nm. In the case of a Gaussian incident beam with left circular polarizing, this metalens simultaneously forms two vortex beams with topological charges one and two at the focal length of 6 μm.

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来源期刊
CiteScore
1.50
自引率
11.10%
发文量
25
期刊介绍: The journal covers a wide range of issues in information optics such as optical memory, mechanisms for optical data recording and processing, photosensitive materials, optical, optoelectronic and holographic nanostructures, and many other related topics. Papers on memory systems using holographic and biological structures and concepts of brain operation are also included. The journal pays particular attention to research in the field of neural net systems that may lead to a new generation of computional technologies by endowing them with intelligence.
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