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The eccentric coaxial metal waveguide is similar to concentric coaxial structure, which has been studied extensively in the plasmonics community. Compared to the concentric structure, the eccentric structure has many benefits, including: (1)stronger subwavelength field localization around the narrowest gap, (2) improved optical coupling to the lowest order mode due to linear polarization, and (3)...
In a resonant cavity or a gap, with a nanometer-sized width and depth on an Au surface, filled up with SiO2, the electric field intensity is enhanced by many orders of magnitude by the illumination of a plane wave. Graphical representations of power flow are employed to elucidate how the cavity harvests energy from the incident wave inside to give rise to the enormous field enhancement. The power...
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