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Low-loss subwavelength metal C-aperture waveguide

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Abstract

We present a design of a linear optical waveguide that utilizes a C-shaped metallic nano-aperture that efficiently transports light while maintaining a spot size of λ10. The performance of a C-aperture waveguide is superior to both a regular ridge waveguide and other surface plasmon based metal nano-optical waveguides. The energy transport mechanisms are explained by the coupling of an aperture surface resonance and the thickness resonances inside the guide channel. Finite-difference time-domain simulations of gold C-aperture waveguides are performed for a 1.5μm wavelength incident plane wave. The 1e decay length in power transmission is predicted to be 2.5μm. The total power throughput is 1.66 for the 2.55μm long guide, with an intensity 6 times that of the incident wave at a distance 120nm from the exit plane, having a spot size of 150nm.

© 2006 Optical Society of America

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