Teng Da, Wang Kai
College of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, China.
Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
Nanomaterials (Basel). 2021 Jan 15;11(1):210. doi: 10.3390/nano11010210.
The waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide is investigated based on the effective-index method and the finite element method. Modal properties of the effective mode index, modal loss, and cut-off characteristics of higher order modes are investigated. By modulating the Fermi level, the modal properties of the fundamental mode could be adjusted. The accuracy of the effective-index method is verified by a comparison between the analytical results and numerical simulations. Besides the modal properties, the crosstalk between the adjacent waveguides, which determines the device integration density, is studied. The findings show that the effective-index method is highly valid for analyzing dielectric-loaded graphene plasmon waveguides in the terahertz region and may have potential applications in subwavelength tunable integrated photonic devices.
基于有效折射率法和有限元法，研究了GaAs条形负载石墨烯波导对太赫兹表面等离子体激元的波导特性。研究了有效模式折射率、模式损耗和高阶模式截止特性等模式特性。通过调制费米能级，可以调整基模的模式特性。通过将解析结果与数值模拟结果进行比较，验证了有效折射率法的准确性。除了模式特性外，还研究了决定器件集成密度的相邻波导之间的串扰。研究结果表明，有效折射率法在分析太赫兹区域的介质负载石墨烯等离子体波导方面非常有效，并且可能在亚波长可调谐集成光子器件中具有潜在应用。
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