Unusually Sharp Localized Surface Plasmon Resonance in Supported Silver Nanocrystals with a Thin Dielectric Coating

被引：6
|
作者：
Prezgot, Daniel [1 ]
Bottomley, Adam [1 ,2 ]
Coyle, Jason P. [1 ,2 ]
Ianoul, Anatoli [1 ]
机构：
[1] Carleton Univ, Dept Chem, 1125 Colonel Dr, Ottawa, ON, Canada
[2] Univ British Columbia, Dept Chem, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 22期
基金：
加拿大自然科学与工程研究理事会;
关键词：
OPTICAL-PROPERTIES; METAL NANOPARTICLES; SILICON FILMS; NANOCUBES; SUBSTRATE; SPECTROSCOPY; SENSITIVITY; ABSORPTION; MONOLAYERS; ANISOTROPY;
D O I：
10.1021/acs.jpclett.7b02499
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An unusually sharp localized surface plasmon resonance (sLSPR) is observed for a monolayer of glass-supported silver nanocubes coated with a thin, 5-20 nm, Al2O3 film. The resonance becomes significantly narrower and stronger while losing optical anisotropy and sensitivity to the surroundings with increasing overlayer thickness. Surface-enhanced Raman scattering excitation profiles indicate an additional enhancement to the electric field brought in by the sLSPR. The resonance is thought to originate from a Fano-like constructive interference between the quadrupolar and dipolar LSPR modes in supported silver nanocubes leading to enhanced light extinction. This phenomenon is of significance for plasmon-induced charge-transfer processes in photovoltaics and catalysis.
引用
收藏
页码：5555 / 5558
页数：4
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