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Enhancing Near-Field Imaging by Breaking the Diffraction Limit with Fractal Metal Structures

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This study explores a novel method to achieve 2D near-field imaging, utilizing a fractal-like slit on a metallic slab. By inducing both transverse magnetic (TM) and transverse electric (TE) surface plasmon polaritons (SPPs), we demonstrate the capability of this setup to effectively visualize near-field images beyond the diffraction limit. Theoretical principles based on Green's Function illustrate the formation of images from point sources, confirming the validity of our approach. Our findings contribute to the advancements in near-field optics, enhancing imaging techniques.

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Enhancing Near-Field Imaging by Breaking the Diffraction Limit with Fractal Metal Structures

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  1. Method to Fulfill Near-field Image and Break the Diffraction Limit Supervisor: Zhou Lei Xiao Shiyi Department of Physics, Fudan University, Shanghai 200433, China Introduction Structure & Image(simulation) Point Source metallicslab We demonstrated that a fractal-like slit on a metallic slab can induce both TM & TE SPP. Furthermore, we find such SPP can realize 2D near field image. Source Plane Image Plane TM & TE SPP Source Image Single point source without slab fractal-like slit on a metallic slab A-likesource Theory of Image We know that point source is constituted by plane wave. According to Green’s Function theory if for plane wave, we can fulfill near-field image. Conclusion We fulfill 2D near-field image, and find the transmittance of plane wave for each we induce this kind of near-field image. [1] E. Ozbay et. al., Science 311, 189 (2006). [2] J. Gomez Rivas et. al.,Phys. Rev. B 68, 201306 [3] W. Cai et. al., Phys. Rev. B 72, 193101 (2005). [4] T. W. Ebbesen et. al., Nature 391, 667 (1998). Green’s Function Result

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