Dramatic Enhancement of Tip-Enhanced Raman Scattering Mediated by Atomic Point Contact Formation

Nano Letters
Shuyi LiuTakashi Kumagai

Abstract

Tip-enhanced Raman scattering (TERS) in ångström-scale plasmonic cavities has drawn increasing attention. However, Raman scattering at vanishing cavity distances remains unexplored. Here, we show the evolution of TERS in transition from the tunneling regime to atomic point contact (APC). A stable APC is reversibly formed in the junction between an Ag tip and ultrathin ZnO or NaCl films on the Ag(111) surface at 10 K. An abrupt increase of the TERS intensity occurs upon APC formation for ZnO, but not for NaCl. This remarkable observation is rationalized by a difference in hybridization between the Ag tip and these films, which determines the contribution of charge transfer enhancement in the fused plasmonic junction. The strong hybridization between the Ag tip and ZnO is corroborated by the appearance of a new vibrational mode upon APC formation, whereas it is not observed for the chemically inert NaCl.

References

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Sep 19, 2012·Nano Letters·Johannes KernBert Hecht
Nov 9, 2012·Nature·Kevin J SavageJeremy J Baumberg
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Citations

May 4, 2021·Nano Letters·Shuyi LiuTakashi Kumagai
Aug 25, 2021·Nano Letters·Anna RosławskaKlaus Kern

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Methods Mentioned

BETA
scanning tunneling microscopy
Raman scattering
light scattering

Software Mentioned

TERS

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