Probing Local Optical Fields via Ultralow Frequency Raman Scattering from a Corrugated Probe

We revisit nanoscale local optical field imaging via tip-enhanced Raman scattering (TERS). Rather than taking advantage of molecular reporters to probe different aspects of the local fields, we show how ultralow frequency Raman (ULF) scattering from the (nanocorrugated) metallic probe itself can be...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2023-09, Vol.14 (37), p.8334-8338
Main Authors: Wang, Chih-Feng, Mantilla, Alexander B. C., Krayev, Andrey, Gu, Yi, El-Khoury, Patrick Z.
Format: Article
Language:English
Subjects:
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Physical Insights into Light Interacting with Matter
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Summary:We revisit nanoscale local optical field imaging via tip-enhanced Raman scattering (TERS). Rather than taking advantage of molecular reporters to probe different aspects of the local fields, we show how ultralow frequency Raman (ULF) scattering from the (nanocorrugated) metallic probe itself can be used for the same purpose. The bright ULF-TERS response we record allows non-invasive (tapping mode feedback) local field imaging, enables visualization of the local fields of small (≥20 nm) isolated plasmonic particles, and can also be exploited to distinguish between Si and SiO2 domains with 5 nm spatial resolution. We describe our approach and its limitations, particularly when it comes to using all-metallic versus molecular reporters.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.3c02122