Resonant wedge-plasmon modes in single-crystalline gold nanoplatelets

被引：80

作者：

Gu, Lin ^{[1
]}

Sigle, Wilfried ^{[1
]}

Koch, Christoph T. ^{[1
]}

Oeguet, Burcu ^{[1
]}

van Aken, Peter A. ^{[1
]}

Talebi, Nahid ^{[1
,2
]}

Vogelgesang, Ralf ^{[3
]}

Mu, Jianlin ^{[4
]}

Wen, Xiaogang ^{[4
]}

Mao, Jian ^{[4
]}

机构：

[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[2] Univ Tehran, Sch Elect & Comp Engn, Ctr Excellence Appl Electromagnet Syst, Photon Res Lab, Tehran, Iran

[3] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[4] Sichuan Univ, Sch Mat Sci & Engn, Chengdu 610065, Peoples R China

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 19期

基金：

中国国家自然科学基金;

关键词：

SILVER TRIANGULAR NANOPRISMS; NEAR-FIELD; SURFACE-PLASMONS; LIGHT-SCATTERING; WAVE-GUIDE; NANOPARTICLES; SPECTROSCOPY; EFTEM;

D O I：

10.1103/PhysRevB.83.195433

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using energy-filtered transmission electron microscopy we measured surface-plasmon resonances of gold nanoplatelets with different shapes and edge lengths at high spatial resolution. We find equidistant maxima of the energy-loss probability along the platelet edges. The plasmon dispersion of the different geometries is very similar, i.e., hardly dependent on specimen shape. The experimental results are verified by means of finite-difference time-domain calculations which reveal the presence of wedge-plasmon polaritons propagating along the platelet edges. At platelet corners, apart from radiative losses, wedge-plasmon polaritons are partially reflected or transmitted to neighboring edges. The interference of all these contributions leads to the observed plasmon resonance modes. This is an essential step towards a thorough understanding of plasmon eigenmodes in prismatic nanoplatelets.

引用

页数：7

共 48 条

[1] Valence-electron energy loss near edges, truncated slabs, and junctions [J].