Nanoscale imaging of phonon modes in a plasmonic nano-cavity using tip-enhanced Raman spectroscopy in ambient

Maria Vanessa Oguchi; Norihiko Hayazawa; Takuo Tanaka

doi:10.1117/12.2677249

5 October 2023 Nanoscale imaging of phonon modes in a plasmonic nano-cavity using tip-enhanced Raman spectroscopy in ambient

Maria Vanessa Oguchi, Norihiko Hayazawa, Takuo Tanaka

Author Affiliations +

Proceedings Volume PC12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI; PC126480Q (2023) https://doi.org/10.1117/12.2677249
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

In this work, we conducted nanoscale imaging of both the Raman peaks and electron Raman scattering to study the strain and doping of graphene wrinkles and compared the varying Raman spectral characteristics to flat graphene using tip-enhanced Raman spectroscopy (TERS). We found that on the wrinkle, anisotropic strain and non-uniform doping was present. We also found that the G band peaks were broader on the flat graphene as compared to on the wrinkle and attribute it to the plasmon-mediated excitation that opens other possible paths for electron-hole recombination due to the high electric field confinement underneath the tip apex. A broad background continuum that we surmise is electronic Raman scattering originating from both the graphene monolayer and the Au(111) substrate was observed and when imaged has a strong correlation to the TERS images of the Raman peaks.

Conference Presentation

Citation Download Citation

Maria Vanessa Oguchi, Norihiko Hayazawa, and Takuo Tanaka "Nanoscale imaging of phonon modes in a plasmonic nano-cavity using tip-enhanced Raman spectroscopy in ambient", Proc. SPIE PC12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI, PC126480Q (5 October 2023); https://doi.org/10.1117/12.2677249

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