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 . 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 wavelength incident plane wave. The decay length in power transmission is predicted to be . The total power throughput is 1.66 for the long guide, with an intensity 6 times that of the incident wave at a distance from the exit plane, having a spot size of .
© 2006 Optical Society of America
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