Bi-Functional Meta-Surfaces for Ultra-Wideband Absorption and Broadband Polarization Conversion

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2024-07-29 DOI:10.1109/LPT.2024.3434950

Guotai Liu;Rui Yang;Cheng Zhu;Zenghu Fan

引用次数: 0

Abstract

We demonstrate the dynamically switching of the ultra-wideband absorption and the broadband polarization conversion through a bi-functional hybrid meta-surface design consisting of periodic stacked vanadium-dioxide (VO2) rings coated with graphene resonators. More specifically, such a hybrid graphene VO2 meta-surface is capable of trapping electromagnetic fields with more than 95% absorption rate from 1.43 to 8.96 THz when we impose 0 eV Fermi energy level over the graphene array with conducting-state VO2. On the other hand, highly efficient linear-to-circular polarization conversion with greater than 0.95 ellipticity can be achieved from 1.24 to 3.57 THz when the graphene Fermi energy level is set as 1 eV with insulating-state VO2. The design scheme using hybrid meta-surfaces with contemporary tunable materials to achieve ultra-wide band reconfigurable multi-functionalities, should pave the way for more advanced manipulations of electromagnetic fields.

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用于超宽带吸收和宽带极化转换的双功能元表面

我们展示了通过一种双功能混合元表面设计实现超宽带吸收和宽带偏振转换的动态切换，这种元表面由涂覆石墨烯谐振器的周期性堆叠二氧化钒（VO2）环组成。更具体地说，当我们在石墨烯阵列上施加 0 eV 费米能级的导电态 VO2 时，这种混合石墨烯 VO2 元表面能够捕获 1.43 至 8.96 THz 的电磁场，吸收率超过 95%。另一方面，当石墨烯费米能级设定为 1 eV 并使用绝缘态 VO2 时，可在 1.24 至 3.57 THz 范围内实现高效的线性到圆极化转换，椭圆度大于 0.95。利用混合元表面和当代可调谐材料实现超宽带可重构多功能的设计方案，应能为更先进的电磁场操纵铺平道路。

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

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.