Circular dichroism of planar chiral magnetic metamaterials

Opt Lett. 2007 Apr 1;32(7):856-8. doi: 10.1364/ol.32.000856.


We propose, fabricate, and study a double-layer chiral planar metamaterial that exhibits pronounced circular dichroism at near-infrared wavelengths. The antisymmetric oscillation modes of the two coupled layers allow local magnetic-dipole moments and enhanced polarization effects compared with similar single-layer systems where only electric-dipole moments occur. Experiment and rigorous theoretical calculations are in good agreement.