Liu Xinwang, Liu Hongjun, Sun Qibing, Huang Nan
Appl Opt. 2015 Apr 10;54(11):3478-83. doi: 10.1364/AO.54.003478.
In this paper, a metamaterial terahertz (THz) switch based on a split-ring resonator embedded with photoconductive silicon is presented and numerically investigated. Simulation results show that the switch works at two different resonant modes with different pump light powers and that the response time of the switch is less than 1 ps. By defining the switching window as the frequency range where the transmission magnitude of the ON state is one order of magnitude higher than the OFF state, a switching window ranging from 1.26 to 1.49 THz is obtained. The large modulation depth of the switch is due to the large separations of the maximum and minimum transmissions, which are 0.89 and 0.01, respectively. Particularly, the switch is frequency tunable by changing the thickness and permittivity of the dielectric layer.
本文提出并对一种基于嵌入光电导硅的裂环谐振器的超材料太赫兹（THz）开关进行了数值研究。仿真结果表明，该开关在不同泵浦光功率下以两种不同的谐振模式工作，且开关的响应时间小于1皮秒。通过将开关窗口定义为导通状态的传输幅度比截止状态高一个数量级的频率范围，获得了一个从1.26到1.49太赫兹的开关窗口。开关的大调制深度归因于最大和最小传输之间的大间隔，分别为0.89和0.01。特别地，通过改变介电层的厚度和介电常数，该开关是频率可调的。
