Guo Xuguang, Xue Lejie, Yang Zhenxing, Xu Mengjian, Zhu Yiming, Shao Dixiang, Fu Zhanglong, Tan Zhiyong, Wang Chang, Cao Juncheng, Zhang Chao
Terahertz Spectrum and Imaging Technology Cooperative Innovation Center, Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China.
Nanomaterials (Basel). 2021 Feb 7;11(2):421. doi: 10.3390/nano11020421.
Terahertz reflection behaviors of metallic-grating-dielectric-metal (MGDM) microcavity with a monolayer graphene embedded into the dielectric layer are theoretically investigated. A tunable wideband reflection dip at about the Fabry-Pérot resonant frequency of the structure is found. The reflectance at the dip frequency can be electrically tuned in the range of 96.5% and 8.8%. Because of the subwavelength distance between the metallic grating and the monolayer graphene, both of the evanescent grating slit waveguide modes and the evanescent Rayleigh modes play key roles in the strong absorption by the graphene layer. The dependence of reflection behaviors on the carrier scattering rate of graphene is analyzed. A prototype MGDM-graphene structure is fabricated to verify the theoretical analysis. Our investigations are helpful for the developments of electrically controlled terahertz modulators, switches, and reconfigurable antennas based on the MGDM-graphene structures.
理论研究了在介质层中嵌入单层石墨烯的金属-光栅-介质-金属（MGDM）微腔的太赫兹反射行为。发现在该结构的法布里-珀罗共振频率附近存在一个可调谐的宽带反射凹陷。凹陷频率处的反射率可在96.5%至8.8%的范围内进行电调谐。由于金属光栅与单层石墨烯之间的亚波长距离，倏逝光栅狭缝波导模式和倏逝瑞利模式在石墨烯层的强吸收中都起着关键作用。分析了反射行为对石墨烯载流子散射率的依赖性。制备了一个MGDM-石墨烯结构原型以验证理论分析。我们的研究有助于基于MGDM-石墨烯结构的电控太赫兹调制器、开关和可重构天线的发展。
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