Nanofocusing of hybrid plasmons-phonons-polaritons in a graphene-hexagonal boron nitride heterostructure

被引：9
|
作者：
Zhu, Bofeng [1 ,2 ]
Ren, Guobin [1 ,2 ]
Wu, Beilei [1 ,2 ]
Gao, Yixiao [1 ,2 ]
Li, Haisu [1 ,2 ]
Jian, Shuisheng [1 ,2 ]
机构：
[1] Beijing Jiaotong Univ, Key Lab All Opt Network & Adv Telecommun Network, EMC, Beijing 100044, Peoples R China
[2] Beijing Jiaotong Univ, Inst Lightwave Technol, Beijing 100044, Peoples R China
来源：
OPTICS LETTERS | 2016年 / 41卷 / 19期
关键词：
NANOPHOTONICS; METAMATERIALS;
D O I：
10.1364/OL.41.004578
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this Letter, we investigate the nanofocusing of hybrid plasmons-phonons-polaritons (SPP-HPhPs) in a graphene-hexagonal boron nitride (h-BN) heterostructure with a graphene coating on a tapered h-BN slab. Compared with the hyperbolic phonon polariton (HPhP) in h-BN, the hybrid SPP-HPhP in a heterostructure exhibits much smaller losses, which is validated through both analytical and numerical methods. Furthermore, the thickness dependent dispersions of a hybrid SPP-HPhP enable the tapered heterostructure to achieve a function of focusing electromagnetic waves. Compared with the tapered h-BN slab, the field enhancement in a tapered heterostructure is improved evidently with a maximum enhancement of the amplitude of normalized electric field over 60. This nanofocusing scheme may have potential in applications such as nonlinear optics. (C) 2016 Optical Society of America
引用
收藏
页码：4578 / 4581
页数：4
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