Influence of local environment on the intensity of the localized surface plasmon polariton of Ag nanoparticles |
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Authors: | Huang Qian Zhang Xiao-Dan Zhang He Xiong Shao-Zhen Geng Wei-Dong Geng Xin-Hua and Zhao Ying |
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Institution: | Institute of Photo-electronics Thin Film Devices and Technique of Nankai University, Key Laboratory of Photo-electronics Thin Film Devices and Technique of Tianjin, Key Laboratory of Opto-electronic Information Science and Technology (Nankai University and Tianjin University), Ministry of Education, Tianjin 300071, China |
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Abstract: | A combined Ag nanoparticle with an insulating or conductive
layer structure has been designed for molecular detection using
surface enhanced Raman scattering microscopy. Optical absorption
studies revealed localized surface plasmon resonance, which shows
regular red shift with increasing environmental dielectric
constant. With the combined structure of surface enhanced Raman
scattering substrates and rhodamine 6G as a test molecule, the
results in this paper show that the absorption has a linear
relationship with the local electromagnetic field for insulating
substrates, and the electrical property of the substrate has a
non-negligible effect on the intensity of the local electromagnetic
field and hence the Raman enhancement. |
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Keywords: | silver nanoparticles resonance absorption surface
enhanced Raman scattering local environment |
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