摘要
基于轨道角动量在光学领域的应用潜力,提出了一种工作在太赫兹频段的S型交叉极化反射式宽带超表面。通过仿真研究了 S型单元结构的极化转换特性和反射相位特性,并利用六种不同参数单元结构的有序排列构建了反射式宽带超表面。仿真结果表明,设计的单元结构不仅可以实现高效率的交叉极化反射幅度,而且通过调整尺寸参数可以实现有效的相位调控;在5. 1 THz ~7. 4 THz频段范围内,该超表面将线偏振波转化为涡旋波束,效率达到了 80%以上。
Based on theapplication potential of orbital angular momentum in the field of optics, an S-type cross- polarized broadband metasurface operating in the terahertz band was proposed. The polarization conversion characteris? tics and reflection phase characteristics of the S-type unit cell were studied experimentally and theoretically, and two reflective metasurfaces were constructed by using ordered arrangement of six different-parameter unit cells. Simulation results show that the designed S-type unit cell can not only achieve high-efficiency cross-polarization reflection ampli tude ,but also achieve effective phase regulation by adjusting the size parameters. In the frequency range of 5. 1 7. 4 THz, metasurface converts linearly polarized waves intovortex beam and efficiency is above 80%.
作者
冯文静
唐皓
吴季达
黄铭
杨晶晶
FENG Wenjing;TANG Hao;WU Jida;HUANG Ming;YANG Jingjing(School of Information Science and Engineering, Yunnan University, Kunming 650091 , China;Radio Monitoring Center of Yunnan Province, Kunming 650228 , China)
出处
《激光杂志》
北大核心
2019年第7期56-59,共4页
Laser Journal
基金
国家自然科学基金(No.61461052
No.11564044
No.61863035)
关键词
太赫兹
轨道角动量
超表面
涡旋波束
宽带
terahertz
orbital angular momentum
metasurface
vortex beam
broadband
