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Good sensing performance is observed in metal–dielectric–metal (MDM) waveguides in recent research. However, Ag will be oxidized in air. The oxidization layer makes the sensing performance not as high as before. Plating an SiO2 film on the surface of the Ag waveguide not only can avoid oxidization but can keep good sensing performance through our numerical discussion as well. The decaying rate of...
A novel form of optical screw dislocation based on localized surface-plasmon modes (SPMs) is described. In particular, we show that a metallic sheet in the form an infinitesimally thin film deposited on a planar dielectric substrate creates surface-plasmon modes due to evanescent Laguerre-Gaussian (LG) light. The characteristic property of such a mode is the exponential decay with distance normal...
When particles are smaller than wavelength of incident light, the light can be considered as static field. We calculate the electric field enhancement by plasmon in the gap between two paralleled metallic nano wires.
We report on an imaging system which provides refractive index and fluorescence distributions using localized surface plasmons. We experimentally confirmed that the images of an isolated fluorescent particle reflect the properties of calculated electric-field distribution.
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