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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CK_1

Frequency and time domain analysis of cavity plasmon waveguides

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Abstract

Among the different waveguide architectures, the so-called coupled resonator optical waveguide (CROW) attracts a continuously growing interest because of its promise in optoelectronics. A simple type of CROW is a linear chain of equally spaced metallic nanoparticles where light is transmitted through coupled particle-plasmon modes and can transport electromagnetic energy on a scale below the diffraction limit. We have recently suggested [1] an alternative type of plasmonic CROW, which consists of identical dielectric nanoparticles periodically arranged along a line in a metallic material. This waveguide represents a means of light localization and transport at subwavelength spatial dimensions, without any radiation losses, and thus may enable fabrication of integrated nanoscale optical components. In the present contribution we propose and analyze a specific design of this so-called cavity plasmon waveguide, consisting of spheroidal silicon nanoparticles in gold, which ensures single-mode operation at visible frequencies and can be realized in the laboratory using modern nanofabrication techniques. The plasmon modes of the cavities correspond to complex eigenfrequencies because of absorptive losses in the metallic material. We discuss the possibility of compensating for these losses by infiltrating the silicon nanoparticles with activedth of the waveguide bands varies strongly with the nearest-neighbor distance, and group velocities as large as 10% of the velocity of light in vacuum can be achieved. Contrary to the case of spherical particles, the nonspherical ones generate three nondegenerate bands about the eigenfrequencies of the dipole plasmon modes of the single cavity. The modes of the highest-frequency band, which is well separated from the other bands, are totally transmitted through the chain however it bends from cavity to cavity on the plane normal to their major axis, provided that the distance between nearest neighbors remains the same. Our results are analyzed, also, in the light of a simple tight-binding model, which enables physical insight. The model becomes more accurate as the interparticle separation increases. Finally, we study the response of the above waveguide under time varying excitations by a localized light source. Specifically, starting from the time-depended Maxwell equations, we obtain a system of differential equations in a tight-binding form [2] and discuss spatio-temporal solutions of these equations for specific types of excitation.

© 2007 IEEE

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