Tunable, Mid-Infrared Ultra-Narrowband Filtering Effect Induced by Two Coplanar Graphene Strips

被引:0
|
作者
Hong-Ju Li
Ling-Ling Wang
Jian-Qiang Liu
Zhen-Rong Huang
Bin Sun
Xiang Zhai
机构
[1] Hunan University,School of Physics and Microelectronic and Key Laboratory for Micro
[2] Jiujiang University,Nano Physics and Technology of Hunan Province
来源
Plasmonics | 2014年 / 9卷
关键词
Graphene; Surface plasmon polaritons; Mid-infrared; Ultra-narrowband; Filter;
D O I
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中图分类号
学科分类号
摘要
The two coplanar graphene strips coupling system supported on substrates is proposed and constructed on a monolayer graphene by spatially varying gate voltages. It is investigated numerically by using the finite-difference time-domain method. Simulation results reveal that despite of no traditional ring, disk, and rectangular geometry resonators used usually in metallic plasmonic filters, this structure based on the edge mode propagation exhibits an original, ultra-narrowband band-stop filtering effect in the mid-infrared region. This filtering effect results from the novel side-coupled resonator formed by the parallel graphene strips. The transmission spectrum is tuned and modified not only by engineering the locations of gate voltages without re-fabricating structures but also via changing substrates. Simulation results are consistent with the theoretical analysis. Our studies hence support the fabrication of ultra-compact planar plasmonic devices in nano-integrated circuits.
引用
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页码:1239 / 1243
页数:4
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