| Outline of Final Research Achievements |
This research aimed to obtain an atomic-level understanding of lattice vibrations (phonons), which play a crucial role in the physical properties of low-dimensional materials, by developing advanced techniques in tip-enhanced Raman spectroscopy (TERS), including ultrafast time-resolved measurements. Using an ultra-high vacuum, low-temperature TERS system, we demonstrated that phonons in oxide ultrathin films, graphene nanoribbons, and single fullerene molecules could be detected with high sensitivity. Based on anti-Stokes Raman scattering spectra, the microscopic mechanisms of phonon excitation (local heating) at the nanoscale were elucidated. Furthermore, by combining this with 10-femtosecond near-infrared ultrashort pulse lasers, nanoscale coherent phonon spectroscopy was also successfully achieved.
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