Probing Vertical and Horizontal Plasmonic Resonant States in the Photoluminescence of Gold Nanodisks

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• 作者：Liyong Jiang ; Tingting Yin ; Zhaogang Dong ; Hailong Hu ; Mingyi Liao ; David Allioux ; Shawn J. Tan ; Xiao Ming Goh ; Xiangyin Li ; Joel K. W. Yang ; Zexiang Shen
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：2
• 期：8
• 页码：1217-1223
• 全文大小：646K
• ISSN：2330-4022

文摘

Localized surface plasmon resonance (LSPR) on gold nanoparticles and nanostructures shows its capability to modulate the spontaneous emission rate for photoluminescence. However, beyond the quasi-static limit with oblique incidence conditions, probing a retardation-based plasmonic resonant state excited by the horizontal incident wave-vector component has not been reported yet in the plasmon-mediated photoluminescence of gold nanostructures. In this paper, we investigated the photoluminescence of individual and coupled gold nanodisks with increasing size, and the peaks in the size-dependent photoluminescence spectra are shown to originate from the preferential excitation of vertical (LSPR) and horizontal (retardation-based) plasmonic resonant states. We have also proposed a three-step model to well describe the contribution of vertical and horizontal plasmonic resonant states in the photoluminescence of gold nanodisks. Our study makes a new contribution to the understanding of photoluminescence from gold nanostructures, and it paves the way toward the applications of plasmon-mediated luminescence and biological studies.