Terahertz binary coder based on graphene metasurface
Terahertz binary coder based on graphene metasurface
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DOI：
10.1016/j.carbon.2021.08.011
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发表时间：
2021-08-17
期刊：
影响因子：
10.9
通讯作者：
Liu, Yongchen
中科院分区：
文献类型：
--
作者：
Gong, Yumin;Hu, Fangrong;Liu, Yongchen
在本文中，我们展示了一个太赫兹（THz）的二进制编码器的石墨烯超颖表面的基础上。该器件的单元由两个平行的金属棒和两个嵌入两个石墨烯带的开口环谐振器（SRR）组成。对于单位单元中的两个SRR，一个分别连接到器件右侧的电极，另一个连接到器件左侧的电极。当不加电压时，器件具有中心频率分别为0.85THz和1.14THz的两个通带。与许多THz可调谐滤波器同时调制不同频带的幅度不同，该编码器可以实现对每个通带的单独调制。通过分别电调节每个SRR上石墨烯的费米能，在两个中心频率处的最大调制深度可以分别高达80%和87%。进而实现了THz频段二进制编码的功能，即，在传输中获得四个不同的二进制编码器11、10、01和00。本工作为多功能集成太赫兹器件的研制开辟了一条新的途径，对太赫兹开关、通信和单片集成太赫兹系统具有重要意义。(c)2021爱思唯尔有限公司版权所有。
In this paper, we demonstrate a terahertz (THz) binary encoder based on graphene metasurface. The unit cell of the device consists of two parallel metal bars and two split-ring resonators (SRRs) embedded with two graphene ribbons. For two SRRs in the unit cell, one is connected to an electrode on the right side, and the other is connected to the electrode on the left side of the device, respectively. When no voltage is applied, the device has two passbands whose central frequencies locating at 0.85 THz and 1.14 THz, respectively. Unlike many THz tunable filters which modulate the amplitude of different bands at the same time, this encoder can achieve separately modulation of each passband. By electrically adjusting the Fermi energy of graphene on each SRR individually, the maximum modulation depth at the two central frequencies can be up to 80% and 87%, respectively. Furthermore, the function of THz frequency range binary coding is realized, i.e., four different binary coders of 11, 10, 01 and 00 are obtained in the transmission. Our work paves a new way for the development of multifunctional integrated THz devices, which will be of great significance in THz switching, communication and one-chip integrated THz system. (c) 2021 Elsevier Ltd. All rights reserved.