Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 136, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3675567
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [470, 21020038, 20510111, 21310071]
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [23560049, 21310071, 20510111, 21020038] Funding Source: KAKEN
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We analyze blinking in surface enhanced resonance Raman scattering (SERRS) and surface enhanced fluorescence (SEF) of rhodamine 6G molecules as intensity and spectral instability by electromagnetic (EM) mechanism. We find that irradiation of intense NIR laser pulses induces blinking in SERRS and SEF. Thanks to the finding, we systematically analyze SERRS and SEF from stable to unstable using single Ag nanoparticle (NP) dimers. The analysis reveals two physical insights into blinking as follows. (1) The intensity instability is inversely proportional to the enhancement factors of decay rate of molecules. The estimation using the proportionality suggests that separation of the molecules from Ag NP surfaces is several angstroms. (2) The spectral instability is induced by blueshifts in EM enhancement factors, which have spectral shapes similar to the plasmon resonance. This analysis provides us with a quantitative picture for intensity and spectral instability in SERRS and SEF within the framework of EM mechanism. (C) 2012 American Institute of Physics. [doi:10.1063/1.3675567]
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