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專題演講 Nanometeric Photon Imaging by Tip Enhancement Effect Abstract Tip enhancement effect enables nanometeric photon imaging of single molecules and single carbon nanotubes. Two experiments will be presented. First, by the precision injection of tunneling electrons by a scanning tunneling microscope (STM), electroluminescence imaging of a porphyrin molecule with submolecular resolution is achieved. Photon imaging of ring-like pattern with 4-fold symmetry is further resolved as two orthogonal vibronic transitions after incorporating spectral selectivity. STM-electroluminescence is through an intramolecular transition from two orthogonal LUMOs to a HOMO state, which is coupled and enhanced by the localized surface plasmon in the STM junction. Second, TERS (tip enhanced Raman spectroscopy) imaging of the individual Raman modes of CNT is demonstrated with 1.7 nm lateral resolution based on the enhancement and positioning of a STM tip. Different Raman modes show characteristic distributions in the length scale of a few nanometers. With superior resolution, we observe beautiful underlying physical chemistry of CNTs, including diameter effect, local defect, and bundling effect in real space and further distinguish one of the CNTs as a multiwall CNT. Time:12/24(Thu.) 13:20-15:10 Place:基礎科學大樓B1 次軒聽 (SC001) Speaker:陳祺(Chi, Chen) , 中央研究院應科中心 Host:陳煜璋 (Yu-Chang, Chen)