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Absorption Enhancement in Silicon Waveguides Using Metal Island Films

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Abstract

A fluorescent dye molecule placed within 1000Å of a metal surface is highly damped, due to the efficient energy transfer from the dye to the surface plasmon (SP) mode of the metal.1 This process is a non-radiative coupling of the SP to the near-field of the oscillating dipole. Dipole-SP coupling has also been observed for the case of a metal island film adjacent to a metal surface (the metal particles in the island film act as dipole oscillators when excited by light).2 The notion of dipole-SP coupling can be extended to dipole-waveguide coupling. This coupling is familiar to microwave antenna designers: when an antenna is mounted on a dielectric substrate, a significant portion of the radiation from the antenna can be trapped by the guided modes of the substrate.3 In this paper, we will demonstrate that dipole-waveguide coupling can be used to enhance the absorption properties of silicon waveguide structures.

© 1996 Optical Society of America

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