动态相位组合太赫兹超构透镜在线偏振和任意圆偏振之间可逆转换

IF 15.3 1区 物理与天体物理 Q1 OPTICS Opto-Electronic Advances Pub Date : 2022-01-01 DOI:10.29026/oea.2022.210062
Jitao Li, Guo-cui Wang, Zhen Yue, Jingyu Liu, Jie Li, Chenglong Zheng, Yating Zhang, Yan Zhang, Jianquan Yao
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引用次数: 53

摘要

如果一个超透镜集成了圆偏振光转换函数,那么传统相机中的聚焦透镜和圆偏振光透镜就可以被一个超透镜所取代。然而,在太赫兹(THz)波段,所报道的超构透镜仍然没有获得完美和严格的单手CP,因为它们是通过Pancharatnam-Berry相构建的,使得CP转换同时包含左手CP (LCP)和右手CP (RCP)成分。本文利用动态相位构造了硅基太赫兹超构透镜,实现了单手CP转换。此外,我们还可以将整个超透镜以一定角度旋转来控制多极化状态的转换,从而可以简单地控制入射线性偏振(LP)太赫兹波在不转换的LP、LCP和RCP三种偏振转换状态下的聚焦。此外,太赫兹超透镜的极化转换行为是可逆的,即既可以将LP转化为任意单手CP,也可以将LCP和RCP分别转化为两个垂直的LP。超透镜作为传统CPL和聚焦透镜组的重要候选,有望应用于先进的太赫兹相机,并在分辨LCP和RCP的偏振成像中显示出潜在的应用前景。
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Dynamic phase assembled terahertz metalens for reversible conversion between linear polarization and arbitrary circular polarization
If a metalens integrates the circular polarization (CP) conversion function, the focusing lens together with circular-polariz-ing lens (CPL) in traditional cameras may be replaced by a metalens. However, in terahertz (THz) band, the reported metalenses still do not obtain the perfect and strict single-handed CP, because they were constructed via Pancharatnam-Berry phase so that CP conversion contained both left-handed CP (LCP) and right-handed CP (RCP) components. In this paper, a silicon based THz metalens is constructed using dynamic phase to obtain single-handed CP conversion. Also, we can rotate the whole metalens at a certain angle to control the conversion of multi-polarization states, which can simply manipulate the focusing for incident linear polarization (LP) THz wave in three polarization conversion states, including LP without conversion, LCP and RCP. Moreover, the polarization conversion behavior is reversible, that is, the THz metalens can convert not only the LP into arbitrary single-handed CP, but also the LCP and RCP into two perpendicular LP, respectively. The metalens is expected to be used in advanced THz camera, as a great candidate for traditional CPL and focusing lens group, and also shows potential application in polarization imaging with discriminating LCP and RCP.
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来源期刊
CiteScore
19.30
自引率
7.10%
发文量
128
期刊介绍: Opto-Electronic Advances (OEA) is a distinguished scientific journal that has made significant strides since its inception in March 2018. Here's a collated summary of its key features and accomplishments: Impact Factor and Ranking: OEA boasts an impressive Impact Factor of 14.1, which positions it within the Q1 quartiles of the Optics category. This high ranking indicates that the journal is among the top 25% of its field in terms of citation impact. Open Access and Peer Review: As an open access journal, OEA ensures that research findings are freely available to the global scientific community, promoting wider dissemination and collaboration. It upholds rigorous academic standards through a peer review process, ensuring the quality and integrity of the published research. Database Indexing: OEA's content is indexed in several prestigious databases, including the Science Citation Index (SCI), Engineering Index (EI), Scopus, Chemical Abstracts (CA), and the Index to Chinese Periodical Articles (ICI). This broad indexing facilitates easy access to the journal's articles by researchers worldwide. Scope and Purpose: OEA is committed to serving as a platform for the exchange of knowledge through the publication of high-quality empirical and theoretical research papers. It covers a wide range of topics within the broad area of optics, photonics, and optoelectronics, catering to researchers, academicians, professionals, practitioners, and students alike.
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