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Optical near field in nanometallic slits

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Abstract

The propagation and the distribution of the optical near field in nanometallic slits are measured by a near-field scanning optical microscope. The optical near field for the p-polarized wave is confined to the middle of the slit. In contrast, the near field for the s-polarized wave is located at the edges. A simulation by the finite-difference time-domain method verifies that the near-field distribution for the s-polarized wave is due to the propagation of the surface plasmon wave (SPW) at the air-metal surface. The existence of the SPW also accounts for the extraordinary transmittance of s-polarized light, which is one order of magnitude larger than that of p-polarized light.

©2002 Optical Society of America

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Supplementary Material (2)

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Media 2: AVI (855 KB)     

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Figures (4)

Fig. 1.
Fig. 1. The experimental setup for a collection-mode NSOM
Fig. 2.
Fig. 2. The measured topographic and NSOM images for 100 nm silt. (a) Topography (left) and s-polarized NSOM image (right). (b) Topography (left) and p-polarized NSOM image (right). (c) The propagation of the optical field for s-polarized light.
Fig. 3.
Fig. 3. Animation of the propagation of light in a 100 nm metallic slit. (a) TE mode (839k) (b) TM mode (856k).
Fig. 4.
Fig. 4. The measured topographic and NSOM images for 500 nm silt. (a) Topography (left) and s-polarized NSOM image (right). (b) Topography (left) and p-polarized NSOM image (right). (c) The FDTD simulations of the propagated optical field for s-polarized light (left image) and p-polarized light (right image). The dashed white lines indicate where the NSOM measured.
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