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O: Fachverband Oberflächenphysik

O 36: Plasmonics and Nanooptics

O 36.14: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Optical emission and absorption characteristics of graphene on copper in a tunnel junction — •Hakki Tunç Çiftçi, Berk Zengin, Umut Kamber, Cem Kincal, Dilek Yildiz, and Oğuzhan Gürlü — Istanbul Technical University, Istanbul, Turkey

Graphene has a huge potential for applications in optoelectronic devices due to its relatively small but efficient absorption of photons in a broad range of energies. Still the structural properties of graphene needs to be investigated at the atomic scale in order to expand the applicability of this novel material further in the optics, plasmonics and other related fields. Photon Scanning Tunneling Microscopy (pSTM) is a very useful tool for the purposes of studying structural properties at the atomic level as well as optical properties of graphene with very high, simultaneous, spatial information. In this work Chemical Vapor Deposition (CVD) grown graphene on copper was investigated with ambient pSTM. We studied the photon emission properties of STM among tip and graphene/Cu junction as well as the structural response of the surface due to different optical excitations. Bias voltage dependent characteristic of the tunnel junction under different illuminations were also investigated both on flat terraces and on moiré zones forming on the graphene/Cu system.