X-ray photoelectron diffraction study of ultrathin PbTiO3 films

Abstract.: Full hemispherical X-ray photoelectron diffraction (XPD) experiments have been performed to investigate at the atomic level ultrathin epitaxial c-axis oriented PbTiO3 (PTO) films grown on Nb-doped SrTiO3 substrates. Comparison between experiment and theory allows us to identify a preferential ferroelectric polarization state in a 60 Å -thick PTO film. Multiple scattering theory based on a cluster-model [ Phys. Rev. B $\textbf{63}$ , 075404 (2001)] is used to simulate the experiment

Light scattering from disordered overlayers of metallic nanoparticles

We develop a theory for light scattering from a disordered layer of metal nanoparticles resting on a sample. Averaging over different disorder realizations is done by a coherent potential approximation. The calculational scheme takes into account effects of retardation, multipole excitations, and interactions with the sample. We apply the theory to a system similar to the one studied experimentally by Stuart and Hall [Phys. Rev. Lett. {\bf 80}, 5663 (1998)] who used a layered Si/SiO$_2$/Si sample. The calculated results agree rather well with the experimental ones. In particular we find conspicuous maxima in the scattering intensity at long wavelengths (much longer than those corresponding to plasmon resonances in the particles). We show that these maxima have their origin in interference phenomena in the layered sample.Comment: 19 pages, 12 figure

Analytical solutions to zeroth-order dispersion relations of a cylindrical metallic nanowire

Zeroth-order complex dispersion relations of a cylindrical metallic nanowire have been solved out analytically with approximate methods. The analytical solutions are valid for the sections of the dispersion relations whose frequencies are close to the Surface Plasmon frequency. The back bending of the Surface Plasmon-Polaritons(SPPs) can be well described by the analytical solutions, confirming that the back bending is originated from the metal Ohmic loss. The utility of the back bending point in the dispersion relation for the measurement of the metallic Ohimc loss has also been suggested.Comment: 6pages, 3figure

7th Drug hypersensitivity meeting: part two

No abstract availabl

Contribution of surface plasmons to the ion-induced Kinetic electron emission from metals

info:eu-repo/semantics/nonPublishe

Femtosecond shaping of transverse and longitudinal light polarization

Brixner T, Garcia de Abajo FJ, Pfeiffer W. Femtosecond shaping of transverse and longitudinal light polarization. Opt. Lett. 2004;29(18): 2187

Adaptive ultrafast nano-optics in a tight focus

Brixner T, Garcia de Abajo FJ, Spindler C, Pfeiffer W. Adaptive ultrafast nano-optics in a tight focus. Appl. Phys. B. 2006;84(1-2):89-95

Nanoscopic ultrafast space-time-resolved spectroscopy

Brixner T, Garcia de Abajo FJ, Schneider J, Pfeiffer W. Nanoscopic ultrafast space-time-resolved spectroscopy. Phys. Rev. Lett. 2005;95(9): 93901

X-ray photoelectron diffraction study of Cu(1 1 1): Multiple scattering investigation

Multiple scattering theory based on a cluster model is used to simulate full-hemispherical X-ray photoelectron diffraction measurements in order to verify how state of the art multiple scattering simulations are able to reproduce the experiment. This approach is applied to the Cu(1 1 1) surface for two different photoelectron kinetic energies. Differences and similarities between single and multiple scattering are discussed in comparison with experimental results. We find that the present approach gives very good results despite some limitations