Visualization of Plasmonic Couplings Using Ultrafast Electron Microscopy

被引:24
|
作者
Liu, Haihua [1 ]
Gage, Thomas E. [1 ]
Singh, Prem [2 ]
Jaiswal, Amit [2 ]
Schaller, Richard D. [1 ]
Tang, Jau [3 ]
Park, Sang Tae [4 ]
Gray, Stephen K. [1 ]
Arslan, Ilke [1 ]
机构
[1] Argonne Natl Lab, Ctr Nanoscale Mat, Lemont, IL 60439 USA
[2] Indian Inst Technol Mandi, Sch Basic Sci, Mandi 175005, Himachal Prades, India
[3] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Peoples R China
[4] IDES Inc, Pleasanton, CA 94588 USA
关键词
Plasmonic coupling; gold nanocapsule; graphene; hybriding; ultrafast electron microscopy; photon-induced near-field electron microscopy; discrete dipole approximation; GRAPHENE; NANOPARTICLES; HYBRIDIZATION;
D O I
10.1021/acs.nanolett.1c01824
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, and quantum information. An understanding of the coupling mechanism in these hybrid systems is of vital importance to its applications. Previous efforts in this field mainly focused on spectroscopic studies of strong coupling within the hybrids with no spatial resolution. Here we report direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale by photon-induced near-field electron microscopy in an ultrafast electron microscope for the first time. The proximity of a step in the graphene to the nanocapsule causes asymmetric surface charge density at the ends of the nanocapsules. Computational electromagnetic simulations confirm the experimental observations. The results reported here indicate that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale, enabling promising future plasmonic devices.
引用
收藏
页码:5842 / 5849
页数:8
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