Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Plasmonics and Nanooptics
O 36.9: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
STM induced light emission from pristine and adsorbate covered surfaces — •Ebru Ekici, Maren C. Cottin, Rolf Möller, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany
In scanning tunneling microscopy (STM) mostly elastic tunneling occurs, however, also a very small percentage of inelastic tunneling takes place. This may lead to a local excitation at the tip-sample junction and the following relaxation may be accompanied e.g. by emission of photons [1]. The spectral analysis of the emitted light from the tunneling junction in the STM experiment carries information about the involved radiative decay channels, e.g. within adsorbed organic molecules [2]. Here, we studied the STM induced light emission from (noble metal) substrates which are partially covered with the archetype organic molecules 3,4,9,10-tetracarboxylic dianhydride (PTCDA), copper-phthalocyanine (CuPc) and C60. Spectra of the integral photon yield as a function of the tunneling energy and spatially resolved photon maps for the pristine and molecule covered surfaces will be discussed. Further perspectives for manipulating the light emission properties by adsorbate layers will be presented.
[1] G. Hoffmann, T. Maroutian, and R. Berndt, Phys. Rev. Lett. 93, 076102 (2004)
[2] C. Chen, P. Chu, C. A. Bobisch, D. L. Mills, and W. Ho, Phys. Rev. Lett. 105, 217402 (2010)