摘要
电磁波的极化状态可用在电磁信号处理中加载信息,这在光子器件的发展与应用方面拥有巨大的潜力。在此,我们设计了一个太赫兹频段的动态可调的宽带极化旋转器。该器件是以石墨烯为基础,由四层光栅以及隔离层构成,利用石墨烯的电导率可调特性进行整个器件的极化旋转角可调性能设计。通过数值仿真,验证了它能够将线极化电磁波的极化旋转角在20°到70°之间进行自由调整,实现了旋转角度的连续可调效果,并且具有良好的带宽和透射效率。这对于发展可调太赫兹极化器具有潜在的应用价值。
Polarization conveys valuable information for electromagnetic signal processing exhibiting tremendous potential in developing application driven photonic devices.Here,we propose a tunable broadband terahertz(THz) polarization rotator,which is based on graphene and composed of four gratings and isolated layers.This metamaterial can continuously vary the polarization rotation angle of transmission wave by controlling the Fermi energy of the graphene that can be conveniently achieved by adjusting the bias voltage on the graphene gratings.We employ numerical simulation to demonstrate that the proposed metamaterial present continuous tunability of the polarization rotation angle among range from 20° to 70°,broadband manipulation,and high efficiency.The presented rotator holds promise for developing new metamaterial polarizer in the terahertz regime,and may offer widespread potential applications.
出处
《微波学报》
CSCD
北大核心
2015年第S2期1-4,共4页
Journal of Microwaves
基金
国家自然科学基金(61371034,61301017,61101011)
关键词
极化旋转
可调
石墨烯
宽带
超材料
polarization rotation
tunable
graphene
broadband
metamaterials