ELECTRON-ENERGY-LOSS NEAR SUPPORTED PARTICLES

Article

关键词: SURFACE-PLASMON EXCITATION;    SMALL ALUMINUM SPHERES;    METAL PARTICLES;    DIELECTRIC SPHERES;    SPATIAL-RESOLUTION;    COMPOSITE MEDIA;    LOSS SPECTRA;    MODES;    BEAM;    MICROSCOPY;   

DOI  :  10.1103/PhysRevB.48.14534

来源: SCIE

【 摘 要 】

A general expression for the energy-loss probability in scanning transmission electron microscopy valid for complex microstructures is presented in the framework of classical dielectric theory. Calculations are carried out for small particles half embedded in a planar interface. We used experimental data for the dielectric functions that characterize the media and we take into account the coupling among different multipolar terms. Resonances, present neither in the planar-interface nor in the isolated-sphere energy-loss spectra, are found. The results agree with many experimental results reported in the literature of the last few years. A different behavior between conducting and insulator supports is found. The effect of an oxide coating around the spherical particle is also discussed.

【 授权许可】

Free