Guo Zhongyi, Nie Xiaoru, Shen Fei, Zhou Hongping, Zhou Qingfeng, Gao Jun, Guo Kai
School of Computer and Information, Hefei University of Technology, Hefei 230009, China.
Nanomaterials (Basel). 2018 Aug 26;8(9):665. doi: 10.3390/nano8090665.
As a new field of optical communication technology, on-chip graphene devices are of great interest due to their active tunability and subwavelength scale. In this paper, we systematically investigate optical switches at frequency of 30 THz, including Y-branch (1 × 2), X-branch (2 × 2), single-input three-output (1 × 3), two-input three-output (2 × 3), and two-input four-output (2 × 4) switches. In these devices, a graphene monolayer is stacked on the top of a PMMA (poly methyl methacrylate methacrylic acid) dielectric layer. The optical response of graphene can be electrically manipulated; therefore, the state of each channel can be switched ON and OFF. Numerical simulations demonstrate that the transmission direction can be well manipulated in these devices. In addition, the proposed devices possess advantages of appropriate ON/OFF ratios, indicating the good performance of graphene in terahertz switching. These devices provide a new route toward terahertz optical switching.
作为光通信技术的一个新领域，片上石墨烯器件因其有源可调性和亚波长尺度而备受关注。在本文中，我们系统地研究了频率为30太赫兹的光开关，包括Y型分支（1×2）、X型分支（2×2）、单输入三输出（1×3）、双输入三输出（2×3）和双输入四输出（2×4）开关。在这些器件中，单层石墨烯堆叠在聚甲基丙烯酸甲酯（PMMA）介电层顶部。石墨烯的光学响应可以通过电方式进行操控；因此，每个通道的状态都可以打开和关闭。数值模拟表明，在这些器件中传输方向可以得到很好的操控。此外，所提出的器件具有合适的开/关比优势，表明石墨烯在太赫兹开关方面具有良好性能。这些器件为太赫兹光开关提供了一条新途径。
