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O: Oberflächenphysik
O 32: Nanostrukturen III
O 32.6: Talk
Monday, March 7, 2005, 12:00–12:15, TU EB202
STM-Induced Electroluminescence with a Transparent ITO-Tip — •Robert Branscheid1, Heiko Rochholz1, Volker Jacobsen1, Maximilian Scherff2, Wolfgang Knoll1, and Maximilian Kreiter1 — 1MPI für Polymerforschung, Ackermannweg 10, D-55128 Mainz — 2Fachbereich Bauelemente der Elektrotechnik, Fernuniversität Hagen, Haldenerstr. 182, D-58084 Hagen
A homebuilt STM combined with an efficient optical detection has been used to investigate photon maps of nano-structured gold substrates and disc-shaped single-particles. Common metal tips like Pt/Ir or W often show photon emission consistent with topographical features but presence of the metallic tip ’felt’ by the sample provokes a strong influence on photon emission. Additional distortions caused by multiple-tip phenomena make a correct interpretation almost impossible. Therefore a dielectric tip consisting of indium doped tin oxide (ITO) has been compared with Pt/Ir. This material is assumed to be transparent for optical fields and should thus lead to less tip-induced modifications. As substrate nano-structured triangle patterns have been used showing a plasmon induced field enhancement. Furthermore disk-shaped gold particles have been investigated and isochromat photon maps have provided additionally spectral information.