Fractal plasmonic metamaterials for subwavelength imaging

Abstract

We show that a metallic plate with fractal-shaped slits can be homogenitized 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 resolutions and enhanced field strengths. Microwave experiments reveal that the best achievable resolution is only, and simulations demonstrate that similar effects can be realized at infrared frequencies with appropriate designs.

13 pages, 4 figures

References in corpus (4)

• Theory of surface plasmons and surface-plasmon polaritons
• A Superlens Based on Metal-Dielectric Composites
• Near-field enhancement and sub-wavelength imaging in the optical region using a pair of two-dimensional arrays of metal nanospheres
• Subwavelength resolution for horizontal and vertical polarization by coupled arrays of oblate nanoellipsoids

Cited by in corpus (3)

• Multiband Plasmonic Sierpinski Carpet Fractal Antennas
• Power-law energy level-spacing distributions in fractals
• Exploiting spatiotemporal degrees of freedom for far field subwavelength focusing using time reversal in fractals