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Opt Express. 2010 May 10;18(10):10377-87. doi: 10.1364/OE.18.010377.

Fractal plasmonic metamaterials for subwavelength imaging.

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  • 1Surface Physics Laboratory (State Key Laboratory) and Physics Department, Fudan University, Shanghai 200433, PR China.


We show that a metallic plate with periodic fractal-shaped slits can be homogenized as a plasmonic metamaterial with plasmon frequency dictated by the fractal geometry. Owing to the all-dimensional subwavelength nature of the fractal pattern, our system supports both transverse-electric and transverse-magnetic surface plasmons. As a result, this structure can be employed to focus light sources with all-dimensional subwavelength resolution and enhanced field strengths. Microwave experiments reveal that the best achievable resolution is only lambda/15, and finite-difference-time-domain simulations demonstrate that similar effects can be realized at infrared frequencies with appropriate designs.

(c) 2010 Optical Society of America.

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