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- W2332526522 abstract "Raman spectroscopy and imaging at the single-molecular level in both signal sensitivity and spatial resolution have been a long dream. A recent experimental study of single-molecule Raman mapping with a subnanometer resolution by using a tip-enhanced Raman scattering (TERS) technique is a great step closer to this great dream. However, how the subnanometer spatial resolution is possible with a Raman excitation light spot (“hot spot”) of diameter over 10 nm formed between the tip–substrate nanogap to excite and probe the molecule still remains mysterious. Here we present an optical theory of Raman scattering that accounts for the strong near-field self-interaction of molecule with the plasmonic nanogap due to multiple elastic scattering of light by the molecule. The result shows that the self-interaction effect strongly modulates the Raman excitation and radiation in both the signal intensity and spatial sensitivity, leading to a “super-hot spot” and subnanometer lateral resolution of Raman mapping. The optical theory can help to uncover the full picture of light-matter interaction of atoms and molecules with plasmonic nanostructures and explore unknown frontiers of physics and chemistry at nanoscale." @default.
- W2332526522 created "2016-06-24" @default.
- W2332526522 creator A5013194814 @default.
- W2332526522 creator A5052434455 @default.
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- W2332526522 date "2015-05-11" @default.
- W2332526522 modified "2023-10-16" @default.
- W2332526522 title "Optical Origin of Subnanometer Resolution in Tip-Enhanced Raman Mapping" @default.
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- W2332526522 doi "https://doi.org/10.1021/acs.jpcc.5b02653" @default.
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