基于石墨烯- vo2超表面的宽带吸收和可切换多波段偏振转换

IF 2.3 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Shuo Zhang;Yazheng Hao;Guotai Liu;Rui Yang
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引用次数: 0

摘要

我们展示了宽带吸收和多波段可切换极化转换,通过级联超表面由两个l形图案的周期性金分裂环谐振器和基于石墨烯和二氧化钒(VO2)的金属方环组成。更具体地说,当石墨烯在费米能级为0 eV、VO2处于导电状态时,该超表面能够捕获相对带宽为116%的电磁场,吸收率超过90%。另一方面,当我们将VO2设置为绝缘状态,石墨烯的费米能级设置为0 eV时,该结构可以实现宽带线性到线性极化转换,效率大于90%,相对带宽为74.8%。值得注意的是,当费米能级调整到1 eV时,该结构可以作为多波段线性到圆偏振转换器。该设计在不降低吸收带宽的情况下扩展了极化转换的功能,为更先进的电磁场操作铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Broadband Absorption and Switchable Multiband Polarization Conversion via Graphene-VO2 Metasurface
We demonstrate the broadband absorption and multiband switchable polarization conversions through a cascaded metasurface consisting of periodic gold split-ring resonator formed of two L-shaped patterns and metal square ring based on graphene and vanadium dioxide (VO2). More concretely, the metasurface is able to capture electromagnetic fields with a relative bandwidth of 116% and an absorption rate of more than 90% when graphene is applied with Fermi level of 0 eV and VO2 is in the conducting state. On the other hand, when we set the VO2 in the insulating state and the Fermi level of graphene is set to 0 eV, the structure enables broadband linear-to-linear polarization conversion with an efficiency greater than 90% over a relative bandwidth of 74.8%. Notably, when the Fermi level is adjusted to 1 eV, the structure functions as a multi-band linear-to-circular polarization converter. This design extends the function of polarization conversions without reducing the absorption bandwidth, should pave the way for more advanced manipulations of electromagnetic fields.
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来源期刊
IEEE Photonics Technology Letters
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.
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