利用介电环境调控石墨烯等离激元和基底声子的耦合(封面文章)

量子电子学报 ›› 2020, Vol. 37 ›› Issue (2): 138-143.

利用介电环境调控石墨烯等离激元和基底声子的耦合(封面文章)

曾凯1，范晓东1，王冬利1，李晓光2，曾长淦1

1 中国科学技术大学物理系，安徽合肥 230026； 2 深圳大学高等研究院，广东深圳 518060

收稿日期:2019-04-04 修回日期:2019-09-24 出版日期:2020-03-28 发布日期:2020-03-28
通讯作者: 范晓东 E-mail: cgzeng@ustc.edu.cn
作者简介:曾凯（1993-），四川宜宾人，研究生，主要从事石墨烯等离激元方面的研究。 E-mail: zengkai@mail.ustc.edu.cn
基金资助:
Supported by National Natural Science Foundation of China (国家自然科学基金重点项目，No. 11434009), National Key R&D Program of China (国家重点研发计划项目，No.2017YFA0403600), and Hefei Science Center CAS (中国科学院合肥大科学中心高端用户培育基金，No.2018HSC-UE014).

Modulating of the coupling between graphene plasmon and substrate’s phonon by changing dielectric environment

ZENG Kai1, FAN Xiaodong1, WANG Dongli1, LI Xiaoguang2, ZENG Changgan1

1 Department of Physics, University of Science and Technology of China, Hefei 230026, China; 2 Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China

Received:2019-04-04 Revised:2019-09-24 Published:2020-03-28 Online:2020-03-28

摘要/Abstract

摘要： 石墨烯等离激元在中红外到太赫兹波段有广阔应用前景。以往研究关注于变石墨烯条带周围的介电环境。数值模拟表明，与放置在平整二氧化硅基底上的石墨烯条带相比，放置在凹槽中的石墨烯条带的等离激元和声子耦合增强。此外，在远离声子频率处色散曲线明显下移，低频段两个色散分支的最大光吸收率也有显著提高。而将石墨烯条带放置在凸台上则结果相反。激元和基底声子的耦合可以通过改变石墨烯条带边缘介电环境这种简单方式得到有效调控。

关键词: 等离激元, 石墨烯, 条带, 色散, 声子, 耦合

Abstract: Graphene plasmons have tremendous potential applications in middle-infrared to terahertz frequencies. Previous studies normally focus on the coupling between graphene plasmon and phonon of substrate, while the approach to modulate such coupling has been rarely reported. One possible approach to modulate such coupling is to change thedielectric environment around graphene nanoribbons (GNRs). Numerical simulation indicates that compared with GNRs on flat SiO2 substrate, GNRs in grooves demonstrate stronger coupling between plasmon and phonon. In addition, the dispersion curve of plasmons shifts down when the frequency is away from the frequency of phonon, and the maximum absorption of the two dispersion curve branches at low frequency is also significantly improved. On the contrary, GNRs on the SiO2 protruding platform lead to contrary results. Such observations reveal that the coupling between graphene plasmon and phonon of substrate can be efficiently modulated by simply changing the edge dielectric environment of GNRs.

Key words: plasmon, graphene, ribbon, dispersion, phonon, coupling

中图分类号:

O436.2

曾凯, 范晓东, 王冬利, 李晓光, 曾长淦. 利用介电环境调控石墨烯等离激元和基底声子的耦合(封面文章)[J]. 量子电子学报, 2020, 37(2): 138-143.

ZENG Kai, FAN Xiaodong, WANG Dongli, LI Xiaoguang, ZENG Changgan. Modulating of the coupling between graphene plasmon and substrate’s phonon by changing dielectric environment[J]. Chinese Journal of Quantum Electronics, 2020, 37(2): 138-143.

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