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The propagation of surface plasmon polaritons (SPPs) on Ag waveguides with two different widths is directly observed using dual-probe scanning near-field optical microscopy (DSNOM). We find that the waveguide structure strongly affects the propagation of locally excited SPPs. SPPs in a flat plane structure spread radially, whereas SPPs in a 3.4-μm wide waveguide structure form two-dimensional interference...
Ta 2 O 5 thin-film with a very low density of droplets was obtained on Si(110) substrate by off-axis excimer laser deposition method. The quality of the films was investigated as a function of the deposition pressure and the substrate position. The film with the thickness of 3000 showed a dielectric constant ε = 26.
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