Spatially resolved optical measurements on supported metal particles and oxide surfaces with the STM [Elektronische Ressource] / von Hadj Mohamed Benia

Spatially Resolved Optical Measurements on Supported Metal Particles and Oxide Surfaces with the STM DISSERTATION zur Erlangung des akademischen Grades doctor rerum naturalium (Dr. rer. nat.) Im Fach Physik eingereicht an der Mathematisch–Naturwissenschaftlichen Fakultät I der Humboldt-Universität zu Berlin von Hadj Mohamed Benia geboren am 07.01.1977 in Setif, Algerien Präsident der Humboldt-Universität zu Berlin: Prof. Dr. Christoph Markschies Dekan der Mathematisch–Naturwissenschaftlichen Fakultät I: Prof. Dr. Lutz-Helmut Schön Gutachter: 1. Prof. Dr. Hans-Joachim Freund 2. Prof. Dr. Helmut Winter 3. Prof. Dr. Sergio Valeri Tag der mündlichen Prüfung: 19 November 2008 Abstract In this thesis, the correlation between the optical properties and the local morphology of supported silver nanoparticle ensembles and MgO thin films deposited on Mo(001) systems is explored by means of Photon-STM. In the first section, dome and disk shaped Ag nanoparticle ensembles with increasing density on an alumina film on NiAl(110) were analyzed as well as ordered and disordered ensembles of Ag nanocolloids on HOPG. The aspect ratio of the Ag nanoparticles was found to have a significant influence not only on the Mie plasmon resonance of a single particle, but also on the electromagnetic coupling within the nanoparticle ensembles.