Strong-Field-Enhanced Spectroscopy in Silicon Nanoparticle Electric and Magnetic Dipole Resonance near a Metal Surface

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• 作者：Zengli Huang ; Jianfeng Wang ; Zhenghui Liu ; Gengzhao Xu ; Yingmin Fan ; Haijian Zhong ; Bing Cao ; Chinhua Wang ; Ke Xu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 17, 2015
• 年：2015
• 卷：119
• 期：50
• 页码：28127-28135
• 全文大小：606K
• ISSN：1932-7455

文摘

Strong-field-enhanced spectroscopy in a hybrid dipole resonance system composed of a low-loss semiconductor nanoparticle and metal film is proposed and demonstrated. This hybrid Si nanoparticle on silver system is featuring extraordinary near-field enhancement and large field confinement. Extensive numerical calculations are carried out to investigate the influence of the gap size, particle diameter, and metal substrate on the near-field enhancement response in the Si particle鈥搈etal gap in order to properly model their hybridization. Our analysis reveals that this near-field enhancement originates from the strong gap magnetic resonance response by the Si nanoparticle dipole interaction with metal mirror image and metal film surface plasmon effects. We further demonstrate the strong enhanced Raman spectroscopy of a single silicon nanoparticle over Ag film with a precisely sized molecular spacer layer between them. These results illustrate the capacity and tunability of the low-loss silicon particle on the metal system on surface-enhanced spectroscopic techniques as well as possible applications in optical circuits or building new metamaterials.