Controllable linear asymmetric transmission and perfect polarization conversion in a terahertz hybrid metal-graphene metasurface
| Autor: | Jianhong Zhou, Tingxiang Yang, Jianlin Song, Jianxing Zhao, Tianyu Xu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Terahertz radiation Graphene Finite-difference time-domain method Physics::Optics Fermi energy 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Optics Negative refraction law Electric field 0103 physical sciences Optoelectronics 0210 nano-technology business Circular polarization |
| Zdroj: | Optics express. 27(7) |
| ISSN: | 1094-4087 |
| Popis: | We propose a three layered metal-graphene-metal metasurface to investigate the controllable linear asymmetric transmission and perfect polarization conversion in THz regime, by using the finite-difference time-domain (FDTD) method. An on-to-off control of asymmetric transmission and perfect polarization conversion is achieved by changing the Fermi energy of graphene from 0.8 eV to 0 eV. We present the electric field distribution and Fabry-Perot-like cavity model to analyze the working mechanisms. By gradually shifting the Fermi energy of graphene, two functions are realized, i.e., controllable linear asymmetric transmission and controllable total transmission with near perfect polarization conversion. |
| Databáze: | OpenAIRE |
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