Abstract
Propagating surface plasmon (PSP) excitation, based on the total internal reflection configuration, was introduced into the nanoparticle (NP)-plane junction Raman spectroscopy. Experimental results demonstrated that silver nanospheres within the propagation region of PSP are effectively activated and detected by CCD camera due to their impressive Raman enhancement, which presents around 20 times improvement compared with the conventional NP-induced PSP/LSP co-enhanced Raman spectroscopy. This impressive Raman enhancement along with its high reproducibility of NP-plane junctions makes our configuration an attractive candidature for the PSP-assisted gap-mode surface-enhancement Raman spectroscopy and tip-enhanced Raman spectroscopy.
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Acknowledgments
This work was partially supported by the National Natural Science Foundation of China under grant no. (10974101 and 61036013), Ministry of Science and Technology of China under grant no. 2009DFA52300 for China–Singapore collaborations, and National Research Foundation of Singapore under grant no. NRF-G-CRP 2007–01. XCY acknowledges the support given by Tianjin Municipal Science and Technology Commission under grant no. 11JCZDJC15200.
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Authors Luping Du and Guanghui Yuan contributed equally to this work.
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Du, L., Yuan, G., Tang, D. et al. Tightly Focused Radially Polarized Beam for Propagating Surface Plasmon-Assisted Gap-Mode Raman Spectroscopy. Plasmonics 6, 651–657 (2011). https://doi.org/10.1007/s11468-011-9247-y
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DOI: https://doi.org/10.1007/s11468-011-9247-y