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(a) Schematic of the nanowire geometry and the excitation scheme. The color maps of electric field components are simulated for silver nanowires in a dielectric medium excited with monochromatic light at two vacuum wavelengths: nm (b) and (d); nm (c) and (e). Two different polarization schemes used: excitation and mapped fields are both polarized in the z-direction (b), (c), and in the x-direction (d), (e). The color intensity represents the field strength, and color change represents the filed direction change (enhanced online). [URL: http://dx.doi.org/10.1063/1.4704193.1] [URL: http://dx.doi.org/10.1063/1.4704193.2] [URL: http://dx.doi.org/10.1063/1.4704193.3] [URL: http://dx.doi.org/10.1063/1.4704193.4]10.1063/1.4704193.110.1063/1.4704193.210.1063/1.4704193.310.1063/1.4704193.4
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Photon energy vs axial component of the wavevector for an EM wave in vacuum (solid line), SPP of finite length nanowires (black dots), SPP of an infinitely long nanowire (red squares), and experiment (Ref. 11) (crosses). The dotted and dashed horizontal lines represent the surface plasma frequency of a planar metal surface and the Mie resonance of a spherical metallic nanoparticle, respectively. Inset: Etalon effects in silver nanowires of various lengths in vacuum.
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Field maps of silver nanowire pairs (l = 2000 nm and D = 100 nm), with the top wire in each pair excited with a monochromatic light ( nm), as in Fig. 1(a). The excitation and the resulting field components are polarized in the z-direction. The distance between wires in a pair is d, and the measure of the wire coupling is r, the ratio of the field intensities at the distal ends of the two wires in a pair. Shown are results for uncoated (a) and (b), coated with 50 nm film of glass (c), (d), and coated with 50 nm film of a-Si (e), (f).
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We study the interaction of electromagnetic waves (EM) with metallic nanowire systems for frequencies not far from the surface plasma frequency (polaritonic range). We employ calculation and simulation to show that when excited at one end with axially polarized EM waves,nanowires can function as efficient waveguides of surface plasmon polaritons (SPPs). From the Fabry-Perot resonances of standing SPP waves, we study their dispersion relation and show that for a vanishing SPP wavelength it is identical to that for a planar metallic surface.Nanowire systems can be employed in various nanophotonic applications, and we assess this potential by studying propagation characteristics of these nano-waveguides and their interactions.
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