基于石墨烯的太赫兹可调编码超表面
Graphene based terahertz tunable coding metasurface
董先超 1汪静丽 1万洪丹 1陈鹤鸣 2钟凯3
作者信息
- 1. 南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京 210023
- 2. 南京邮电大学贝尔英才学院,江苏南京 210023
- 3. 天津大学精密仪器与光电子工程学院教育部光电信息技术重点实验室,天津 300072
- 折叠
摘要
论文依据Pancharatham-Berry(PB)几何相位原理,在反射型太赫兹编码超表面单元结构中引入了石墨烯材料,通过调控双层石墨烯结构的费米能级可使其反射幅度动态可调.根据单元的幅度可调特性,设计出具有旋转相位梯度特征的编码序列,产生了幅度可调的涡旋光束.与编码超表面的傅里叶卷积运算相结合,进一步设计能够出射双涡旋光束的编码超表面,大大提升了对涡旋光束数目和散射角度的可控性.其在太赫兹高速通信系统中具有潜在的应用价值.
Abstract
In order to manipulate terahertz wave flexibly,a terahertz tunable coding metasurface unit cell structure is designed based on the Pancharatnam-Berry phase principle and the use of graphene material.It consists of a double-openθ-shaped metal structure on the top layer,a polyimide substrate embedded in a double-layer graphene structure and a metal layer,and its reflection amplitude can be dynamically tuned by modulating the Fermi energy of the bilayer graphene structure.Based on its amplitude tunable characteristic,a coding sequence with rotational phase gradient characteristic is designed to generate an amplitude tunable vortex beam.Combined with the Fourier convolution theory,a coding metasurface capable of emitting a double vortex beam is designed ulteriorly,and the maneuverability of vortex beam numbers and scattering angles is greatly improved in this way.The device designed has potential applications in terahertz high-speed communication system.
关键词
反射型太赫兹编码超表面/PB几何相位原理/石墨烯/涡旋光束Key words
reflective terahertz tunable coding metasurface/Pancharatnam-Berry(PB)phase principle/graphene/vortex beam引用本文复制引用
基金项目
国家自然科学基金(12174199)
国家自然科学基金(61571237)
江苏省自然科学基金(BK20221330)
江苏省自然科学基金(BK20151509)
横向课题(2021外323)
出版年
2024
NETL
NSTL
万方数据