双功能可调节的超表面,用于极化不敏感的电磁感应透明度和双频吸收.
Yunping Qi1, Zihao Zhou1, Qiang Shi1
1College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
Nanotechnology
|September 27, 2023
概括
这项研究引入了一种新的双模式超表面. 它在室温下充当可调节的慢光装置,在高温下充当双频吸收器,两者均由石墨烯控制.
科学领域:
- 特拉赫兹 (THz) 光子学
- 超材料和等离子材料.
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 超表面具有独特的电磁性质.
- 石墨烯和二氧化 (VO2) 是THz应用的可调节材料.
- 对于先进的设备来说,控制THz模式中的光物质相互作用至关重要.
研究的目的:
- 提出和研究一个双操作模式的超表面.
- 为了证明电磁诱导透明度 (EIT) 和双频吸收功能之间的温度控制的切换.
- 探索作为缓慢光装置和折射率传感器的应用.
主要方法:
- 使用双粒子模型进行理论建模.
- 基于有限元素方法的数值模拟.
- 基于石墨烯和VO2的金属表面的制造和表征.
主要成果:
- 在室温下,观察到一种极化不敏感的EIT效应,可以通过石墨烯的费米能量 (EF) 调节.
- 在高温下,超表面表现出双频吸收 (78.6%和99.9%在1.13 THz和2.16 THz),也可通过EF调节.
- 该设备在两种操作模式下都显示出极化不敏感性和宽冲击角度耐受性.
结论:
- 拟议的超表面通过温度切换成功实现了双模式操作.
- 它显示出作为可调节的慢光装置 (最大组延迟0.5ps) 和灵敏的折射率传感器 (最大灵敏度0.5THz/RIU) 的潜力.
- 这项工作为多功能THz设备提供了一个新的平台.
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