材料科学
石墨烯
光电子学
太赫兹辐射
光开关
吸收(声学)
消光比
超材料
超短脉冲
基质(水族馆)
带阻滤波器
谐振器
分裂环谐振器
光学
滤波器(信号处理)
激光器
纳米技术
物理
海洋学
波长
计算机科学
地质学
复合材料
低通滤波器
计算机视觉
作者
Nasrollah Karampour,Najmeh Nozhat
出处
期刊:Journal of The Optical Society of America B-optical Physics
[The Optical Society]
日期:2021-08-24
卷期号:38 (9): 2721-2721
被引量:3
摘要
The emergence of graphene as a new material with several extraordinary optical properties paves a way to introduce new electromagnetic devices in the terahertz (THz) band. In this paper, we have exploited the unique qualities of graphene in combination with the optical Kerr effect in order to propose a new THz switch. In the proposed structure, two graphene layers with circular and notch ring patterns are stacked to obtain two narrowband absorption peaks at the frequencies of 3.65 and 6.5 THz with high absorption values of 92% and 97%, respectively. The imposed pump power in interaction with the nanocomposite substrate provides a controlling mechanism that makes this structure an ideal candidate for all-optical devices in the THz regime. The obtained switching time of the proposed structure is 2 ps, and the maximum extinction ratio of 83% is achieved for the pump power of 273 mW. Moreover, the absorption spectrum of the switch can be manipulated by the chemical potential of graphene layers, which is useful for electro-optical modulation application. The application of the THz switch as an all-optical tunable filter is also studied in this paper.
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