Following the transmission line formalism, we design a metamaterial structure that exhibts negative refraction in the red part of the visible spectrum.The structure is a waveguide consisting of an Al2O 3 top layer, 2D array of Au dots, an Al2O3 spacer and a Ag ground plane. The Au dot array with period of 250 nm were patterned by an electron beam lithography technique. We confirm experimentally and numerically that threre is a mode shifting to the lower energy side as the wavevector increases. Both permittivity and permeability are found to be negative in that region. Focussing effect of a flat structure, which is a characteristic feature of a negative index metamaterial, is also confirmed with FDTD caculation.
|Number of pages||3|
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Publication status||Published - 2009 Apr 6|
|Event||8th International Conference on Excitonic Processes in Condensed Matter, EXCON'08 - Kyoto, Japan|
Duration: 2008 Jun 22 → 2008 Jun 27
ASJC Scopus subject areas
- Condensed Matter Physics