研究目的
Investigating the spatio-spectral characterization of multipolar plasmonic modes of Au nanorods via tip-enhanced Raman scattering.
研究成果
The study demonstrates that TERS spectral imaging can be used to characterize and visualize spatially varying plasmonic resonances in Au nanorods, revealing transitions between modes of different orders. This approach provides a new dimension to local optical field mapping, offering insights into the spatio-spectral properties of plasmonic nanostructures.
研究不足
The study is limited by the spatial resolution of the AFM and the spectral resolution of the Raman spectroscopy setup. Additionally, the thickness of the molecular layer atop the particles was variable, which could affect the consistency of the results.
1：Experimental Design and Method Selection:
The study employs tip-enhanced Raman scattering (TERS) to map the spatial profiles and trace the resonances of dipolar and multipolar plasmonic modes of Au nanorods.
2：Sample Selection and Data Sources:
TBN-coated Au nanorods were immobilized on a silicon substrate for imaging.
3：List of Experimental Equipment and Materials:
A 633 nm laser source, atomic force microscope (AFM) tips coated with Au, and a detection system comprising a Shamrock 500 spectrometer with a Newton EMCCD.
4：Experimental Procedures and Operational Workflow:
TERS signals were recorded in a hybrid AFM feedback mode, combining contact mode for spectral acquisition and tapping mode for sample movement.
5：Data Analysis Methods:
The analysis involved spatio-spectral mapping of the plasmonic modes, with spectral resolution of ~8 cm-1.
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