Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)
O 34.3: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster E
Investigation of excitonic Fano resonances in graphene using optical spectroscopy — •Patrick Herlinger1,2, Daniela Ullrich1,2, Dong-Hun Chae1, Harald Giessen2, Jurgen Smet1, and Markus Lippitz1,2 — 1Max Planck Institute for Solid State Research, Stuttgart — 24th Physics Institute, University of Stuttgart
Using transmission and reflection spectroscopy we examine the optical response of graphene from the visible to the UV regime. The optical absorbance spectrum shows an asymmetric peak of about 10% at around 4.7 eV. We introduced a Fano model which is in excellent agreement with our experimental data. Our model includes an excitonic state beneath the saddle point M of the band structure [1]. We study the influence of the environment on the excitonic Fano resonance. We compare the optical response of free-standing and supported graphene and investigate the dependence on the ambient conditions.
[1] Chae et al., Nano Lett. 11, 1379 (2011)