Fractal plasmonic metamaterials for subwavelength imaging.
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.
Huang
Xueqin
X
Surface Physics Laboratory (State Key Laboratory) and Physics Department, Fudan University, Shanghai 200433, PR China.
Xiao
Shiyi
S
Ye
Dexin
D
Huangfu
Jiangtao
J
Wang
Zhiyu
Z
Ran
Lixin
L
Zhou
Lei
L
D003198:Computer Simulation; D008027:Light; D008420:Manufactured Materials; D008956:Models, Chemical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*