Ultrafast terahertz transparency boosting in graphene meta-cavities
Wang Lan,
An Ning,
Gong Sen,
Sheng Xuan,
Li Yiwei,
Yao Baicheng,
Yu Cui,
He Zezhao,
Liu Qingbin,
Feng Zhihong,
Otsuji Taiichi,
Zhang Yaxin
Affiliations
Wang Lan
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China
An Ning
Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu, China
Gong Sen
Sichuan Terahertz Communication Technology Engineering Research Center, University of Electronic Science and Technology of China, Chengdu, China
Sheng Xuan
Sichuan Terahertz Communication Technology Engineering Research Center, University of Electronic Science and Technology of China, Chengdu, China
Li Yiwei
Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu, China
Yao Baicheng
Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu, China
Yu Cui
National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang, China
He Zezhao
National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang, China
Liu Qingbin
National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang, China
Feng Zhihong
National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang, China
Otsuji Taiichi
Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
Zhang Yaxin
Sichuan Terahertz Communication Technology Engineering Research Center, University of Electronic Science and Technology of China, Chengdu, China
As an exceptional nonlinear material, graphene offers versatile appealing properties, such as electro-optic tunability and high electromagnetic field confinement in the terahertz regime, spurring advance in ultrashort pulse formation, photodetectors and plasmonic emission. However, limited by atomic thickness, weak light–matter interaction still limits the development of integrated optical devices based on graphene. Here, an exquisitely designed meta-cavities combined with patterned graphene is used to overcome this challenge and promote THz-graphene interaction via terahertz location oscillation. By using an 800 nm pump laser, the local field-induced strong interaction allows sensitive responses to the ultrafast energy transfer from the ultrafast optical pump to graphene electron heat, enabling 46.2% enhancement of terahertz transparency. Such optical modulation of terahertz waves shows ultrafast response in delay less than 10 ps. Moreover, thanks to the nature of graphene, the device shows unique potential for electrically dynamic tuning and further bandwidth broadening.
