Tunable negative-index photonic crystals using colloidal magnetic fluids*
Geng Tao†, Wang Xin, Wang Yan, Dong Xiang-Mei
       
The first band gap of odd modes as a function of H and h . Here, H changes from 150 Oe to 250 Oe and h changes from 2 a to 6 a . Solid symbols denote the middle of the band gaps and the vertical bars mark the spans of the band gaps.