Electromagnetic near-field coupling induced polarization conversion and asymmetric transmission in plasmonic metasurfaces
| Autor: | Jian-Hua Luo, Jian-Bo Li, Kai-Jun Wang, Meng-Dong He, Yu-Xiang Peng, Xiaoshuang Chen, Weida Hu, Jian-Qiang Liu, Xin-Min Zhang, Shi-Hua Tan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry Physics::Optics Near field coupling 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Induced polarization Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Resonator Optics Excited state 0103 physical sciences Electrical and Electronic Engineering Physical and Theoretical Chemistry Photonics 010306 general physics 0210 nano-technology business Plasmon Circular polarization |
| Zdroj: | Optics Communications. 412:1-6 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2017.11.077 |
| Popis: | In this paper, we demonstrate the effect of polarization conversion in a plasmonic metasurface structure, in which each unit cell consists of a metal bar and four metal split-ring resonators (SRRs). Such effect is attributed to the fact that the dark plasmon mode of SRRs (bar), which radiates cross-polarized component, is induced by the bright plasmon mode of bar (SRRs) due to the electromagnetic near-field coupling between bar and SRRs. We find that there are two ways to achieve a large cross-polarized component in our proposed metasurface structure. The first way is realized when the dark plasmon mode of bar (SRRs) is in resonance, while at this time the bright plasmon mode of SRRs (bar) is not at resonant state. The second way is realized when the bright plasmon mode of SRRs (bar) is resonantly excited, while the dark plasmon mode of bar (SRRs) is at nonresonant state. It is also found that the linearly polarized light can be rotated by 56.5 0 after propagation through the metasurface structure. Furthermore, our proposed metasurface structure exhibits an asymmetric transmission for circularly polarized light. Our findings take a further step in developing integrated metasurface-based photonics devices for polarization manipulation and modulation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect