Reducing the pump power of optically controlled terahertz metamaterial via tailoring the resistance of the silicon gap region
Reducing the pump power of optically controlled terahertz metamaterial via tailoring the resistance of the silicon gap region
复制标题
通过调整硅间隙区域的电阻来降低光控太赫兹超材料的泵浦功率
DOI：
10.1088/2040-8978/17/10/105108
复制
发表时间：
2015
影响因子：
2.1
通讯作者：
Ren Naifei
中科院分区：
文献类型：
--
作者：
Cong Jiawei;Zhou Zhiqiang;Yao Hongbing;Fu Yonghong;Ren Naifei
Optically tunable metamaterials provide an ultrafast and active manipulation of terahertz wave. We demonstrate a strategy to alleviate the tradeoff between the requirement of low optical pump power and the achievement of significant resonance modulation in the photoexcited metamaterials. We have shown that the resonance strength of split-ring resonator metamaterial is determined by the resistance of its silicon gaps. By reducing the resistance through geometry adjustment of the gap region, the needed photoconductivity and hence the pump power can be substantially reduced without deteriorating the resonance tuning effect. The presented design rule may offer an avenue to realize low-power optically tunable terahertz devices.
