Abstract
We report on the fabrication of double-layer gold crossed-gratings consisting of aconvoluted top gold grating superposed on a bottom gold grating by using an e-beam directwrite technique together with a lift-off process. The crossed-gratings exhibit, in the visiblerange, strong circular dichroism which is dependent upon the incident direction due to theconvoluted top gold grating and also the substrate. Resonance dips in the transmittance ofcircularly polarized light are also observed. The experimental results are explainedqualitatively by simulations using a finite-integration technique. The simulations confirmthat the dips in the transmittance are electromagnetic resonances corresponding to paralleland anti-parallel current flows in the crossed-gratings.
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