META 2021, META'12

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From nano bumps to vertical U-shape three-dimensional gold nano-ring and toroidal metamaterials in optical region
D. P. Tsai

Last modified: 2012-01-03

Abstract


Fabrication of nano bumps and 525ยด525 vertical U-shape nano gold rings (110 nm x 60 nm x 40 nm) on a fused silica substrate has been successfully implemented by laser and e-beam lithography double exposure process. Plasmonic resonance modes of such particles are investigated by finite-element simulations and optical measurements, which are in excellent agreement with each other. Results show the manipulation of the light, and electromagnetic field solely depends on the resonance mode either enhanced between two prongs of vertical U-shape nano ring or enhanced around two prongs of vertical U-shape gold ring. The toroidal metamaterials can provide a compelling evidence of a resonant response attributed to a toroidal dipole excitation.


Keywords


metamaterials, optical, plasmonics, nanophotonics