Multifocal metalens for detecting several topological charges at different wavelengths

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-04-01 DOI:10.18287/2412-6179-co-1170

A. Nalimov, V. Kotlyar

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引用次数: 1

Abstract

A combined high-aperture metalens in a thin silicon nitride film, which consists of two inclined sector metalens, is considered. Each sector metalens consists of a set of binary subwavelength gratings. The diameter of the lens is 14 μm. It has been shown using time-domain finite difference method that the metalens can simultaneously detect optical vortices with two topological charges –1 and –2, in almost the entire visible wavelength range. The metalens can distinguish several wavelengths that are focused at different points in the focal plane: a 1 nm change in wavelength results in a focal spot shift of about 4 nm. When the metalens is illuminated by a Gaussian beam with left-handed circular polarization, two optical vortices with topological charges 1 and 2 are simultaneously formed at 6 nm between each other at focal distance equals 6 nm. This metalens can be used to increase information in transmission channel in wireless telecommunication systems by selecting the space-time modes of laser radiation with different topological charges and different wavelengths. The considered microlens is an example of a compact demultiplexer.

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用于探测不同波长拓扑电荷的多焦超透镜

研究了氮化硅薄膜中由两个倾斜扇形超构透镜组成的组合大孔径超构透镜。每个扇形超构透镜由一组二元亚波长光栅组成。镜片直径为14 μm。用时域有限差分方法表明，超构透镜几乎可以在整个可见波长范围内同时探测到带-1和-2两种拓扑电荷的光学涡流。超透镜可以区分聚焦在焦平面不同点上的几个波长:波长变化1 nm会导致焦斑位移约4 nm。当左旋圆偏振高斯光束照射超构透镜时，在6 nm处同时形成两个拓扑电荷为1和2的光学涡流，彼此之间的焦距为6 nm。该超构透镜可以通过选择不同拓扑电荷和不同波长的激光辐射的时空模式来增加无线通信系统中传输信道的信息量。所考虑的微透镜是紧凑型解复用器的一个例子。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.