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Multifunctional metasurface for broadband absorption, linear and circular polarization conversions
Optical Materials Express ( IF 2.8 ) Pub Date : 2021-09-24 , DOI: 10.1364/ome.437474
Zhaohua Li , Rongcao Yang , Jiayun Wang , Yijia Zhao , Jinping Tian , Wenmei Zhang

With the development of metasurfaces and the improvement of manufacturing technology, it is important and imperative to design novel metasurfaces that can flexibly manipulate terahertz (THz) waves. In this paper, a multifunctional metasurface (MFMS) based on graphene and photosensitive silicon (Si) is proposed, which integrates three functions: broadband absorption, broadband linear and circular polarization conversions in THz band. For absorption mode, the MFMS can absorb above 90% energy in the frequency band of 1.74-3.52 THz with the relative bandwidth of 67.6%. For both linear-linear and circular-circular polarization conversion modes, the relative bandwidth with over 90% polarization conversion rates (PCRs) reaches 49.3% in the frequency band of 1.54-2.55 THz. The working mechanism of the MFMS is analyzed by the surface current distributions, and its properties of the absorption and polarization conversion under oblique incident angles are investigated, respectively. The proposed metasurface has promising prospects in terahertz devices such as modulators, smart switches and other terahertz devices.

中文翻译:

用于宽带吸收、线性和圆偏振转换的多功能超表面

随着超表面的发展和制造技术的进步,设计可以灵活操纵太赫兹(THz)波的新型超表面变得重要且势在必行。在本文中,提出了一种基于石墨烯和光敏硅(Si)的多功能超表面(MFMS),它集成了三种功能:宽带吸收、宽带线性和圆偏振转换在太赫兹波段。对于吸收模式,MFMS可以在1.74-3.52 THz频段内吸收90%以上的能量,相对带宽为67.6%。对于线性-线性和圆-圆偏振转换模式,在 1.54-2.55 THz 频段内,偏振转换率 (PCR) 超过 90% 的相对带宽达到 49.3%。通过表面电流分布分析MFMS的工作机理,并分别研究了其在斜入射角下的吸收和偏振转换特性。所提出的超表面在太赫兹设备中具有广阔的前景,例如调制器、智能开关和其他太赫兹设备。
更新日期:2021-10-01
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