A Long-Range Surface Plasmon Resonance/Probe/Silver Nanoparticle (LRSPR-P-NP) Nanoantenna Configuration for Surface-Enhanced Raman Scattering
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- 作者：Xuyang Xuan ; Shuping Xu ; Yu Liu ; Haibo Li ; Weiqing Xu ; John R. Lombardi
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：October 4, 2012
- 年：2012
- 卷：3
- 期：19
- 页码：2773-2778
- 全文大小：350K
- 年卷期：v.3,no.19(October 4, 2012)
- ISSN：1948-7185
文摘
The purpose of this paper is to enhance Raman signals with a plasmonic nanoantenna based on a long-range surface plasmon resonance/probe/silver nanoparticle (LRSPR-P-NP) sandwich configuration. The finite-difference time-domain simulation shows that the electromagnetic field at the gap between the silver film and a silver nanoparticle increases by a factor of about 2.1 脳 104. The resonance condition of this plasmonic nanoantenna was optimized by incident angle-dependent surface-enhanced Raman scattering (SERS) spectroscopy under an evanescent field excitation mode. The SERS signal obtained under the LRSPR-P-NP configuration at the LRSPR angle was 40 times higher than that collected on the planar film plasmonic nanoantenna. The enhancement factor of the LRSPR-P-NP configuration was 9.2 脳 108. This plasmonic nanoantenna was also applied for pH sensing.