3) Coherent Raman spectroscopy with ultrashort laser pulses
Using impulsive stimulated Raman scattering (ISRS) processes with ultrashort laser pulses (≤10fs), we can coherently drive high-frequency phonons of materials. Further, we also utilize the enhanced electromagnetic field around metal nanostructures deposited on material's surface to elucidate the electron-phonon coupling and coherence/decoherence of various vibrations from local structures or single molecule.
- I. Katayama, S. Koga, K. Shudo, J. Takeda, T. Shimada, A. Kubo, S. Hishita, D. Fujita, and M. Kitajima, "Ultrafast Dynamics of Surface-Enhanced Raman Scattering Due to Au Nanostructures", Nano Letters, 11, 2648 (2011).
- S. Koga, I. Katayama, S. Abe, H. Fukidome, M. Suemitsu, M. Kitajima and J. Takeda, "High-Frequency Coherent Phonons in Graphene on Silicon", Appl. Phys. Express, 4, 045101 (2011). *Selected for Virtual Journal of Ultrafast Science, 10, issue 5 (2011).