Multi-photon Spectroscopic Studies of Molecular Assemblies and Graphene
Multi-photon Spectroscopic Studies of Molecular Assemblies and Graphene.
Oct 09, 2013
from 02:00 pm to 03:30 pm
|Speaker Information||Brookhaven National Lab, Upton NY|
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Ultrathin molecular or atomic systems, including molecular self-assembled monolayer and newly discovered graphene sheets, have attracted much interest for both fundamental science and industrial applications. Our research goal is to understand their electronic and optical properties by means of multi-photon spectroscopic techniques. My presentation includes two separate topics. The first part describes two-photon photoemission studies on interfacial electronic structures of aromatic thiols (thiolphenol and p-fluorothiophenol) adsorbed on Cu (111). The role of thiol adsorbates in shifting the surface polarization and effecting interfacial electronic structure will be discussed. In the second part, I will present optical third-harmonic generation (THG) of graphene on glass substrate. The polarization-, thickness-, and orientation- dependence of THG signals from the graphene will be compared to theoretical prediction using the nonlinear optical slab model.