Enhanced plasmonic nanofocusing of terahertz waves in tapered graphene multilayers

被引：17
|
作者：
Liu, Weiwei [1 ,2 ]
Wang, Bing [1 ,2 ]
Ke, Shaolin [1 ,2 ]
Qin, Chengzhi [1 ,2 ]
Long, Hua [1 ,2 ]
Wang, Kai [1 ,2 ]
Lu, Peixiang [1 ,2 ,3 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China
[3] Wuhan Inst Technol, Lab Opt Informat Technol, Wuhan 430205, Peoples R China
来源：
OPTICS EXPRESS | 2016年 / 24卷 / 13期
基金：
中国国家自然科学基金;
关键词：
NANOWIRE INFRARED PROBE; NEAR-FIELD MICROSCOPY; QUANTUM DOTS; GENERATION; GUIDES; METAMATERIALS; SPECTROSCOPY; PERFORMANCE; POLARITONS; PHOTONICS;
D O I：
10.1364/OE.24.014765
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate the plasmonic nanofocusing of terahertz waves in tapered graphene multilayers separated by dielectrics. The nanofocusing effect is significantly enhanced in the graphene multilayer taper compared with that in a single layer graphene taper due to interlayer coupling between surface plasmon polaritons. The results are optimized by choosing an appropriate layer number of graphene and the field amplitude has been enhanced by 620 folds at lambda = 50 mu m. Additionally, the structure can slow light to a group velocity similar to 1/2815 of the light speed in vacuum. Our study provides a unique approach to compress terahertz waves into deep subwavelength scale and may find great applications in terahertz nanodevices for imaging, detecting and spectroscopy. (C) 2016 Optical Society of America
引用
收藏
页码：14765 / 14780
页数：16
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