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Efficiently squeezing near infrared light into a 21nm-by-24nm nanospot

Ruoxi Yang, Mustafa A.G. Abushagur, and Zhaolin Lu

Open Access Open Access

Abstract

Recent work demonstrated light transmission through deep subwavelength slits or coupling light into waveguides with deep subwavelength dimension only in one direction. In this paper, we propose an approach to squeeze light (λ=1550 nm) from a dielectric waveguide into a deep subwavelength spot. Vertical confinement is achieved by efficiently coupling light from a dielectric waveguide into a 20-nm metal-dielectric-metal plasmonic waveguide. The horizontal dimension of the plasmonic waveguide is then tapered into 20 nm. Numerical simulation shows that light fed from a dielectric waveguide can be squeezed into a 21nm-by-24nm spot with efficiency 62%.

©2008 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Illustration of the coupler and nanotaper.

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Fig. 2.
Fig. 2. Simulation of light coupling from a dielectric waveguide into the MDM plasmonic taper: (a) the Sx distribution in the horizontal plane; (b) the Sx in the vertical plane.

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Fig. 3.
Fig. 3. The x-component of power flow (Px) along the x-axis.

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Fig. 4.
Fig. 4. The spot size at different locations along the x-axis.

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Fig. 5.
Fig. 5. (a). The distribution of electric field amplitude |E(r)| at the plane z=0. (b) The electric field amplitude |E(r)| at the central axis (y=0; z=0) along the propagation direction.

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Fig. 6.
Fig. 6. (a). The effective index and loss for the 20 nm thick MDM plasmonic waveguide with different widths. (b) The overall efficiency for tapers with different lengths.

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