Presentation Information
[3G05【招待講演】]Observation of Photoexcited Electron Dynamics at Organic Surfaces Studied by Two-Photon Photoemission Spectroscopy and Microscopy
*Masahiro Shibuta1 (1. Osaka Metropolitan University)
Two-photon photoemission spectroscopy (2PPES) and microscopy (2PPEEM) are employed to observe ultrafast electron dynamics at organic surfaces. On C60 film on a substrate, ultrafast dynamics of photocarrier generation in the lowest unoccupied molecular orbital (LUMO) of C60 with high energy, spatial, and temporal resolutions. In case of the pentacene nanoislands formed on a substrate, 2PPEEM reflects the lateral distribution of excitons confined in the nanocrystal, in which time-resolved 2PPEEM captured the spatiotemporal evolution of hot electrons dissipated into the substrate in 1 ps or sub μm ranges. I will also demonstrate that 2PPES and 2PPEEM are valuable to observe plasmonic phenomena, which are promising to enhance the functionalities of organic system. These spectroscopic and microscopic methods probing 2P-photoemission have high potential to reveal the optelectric and plasmonic properties of various functional nanoscale systems including 2D materials and nanoparticles.