Complete Band Gaps in the Visible Range Achieved by a Low‐Refractive‐Index Material

A holography technique to fabricate photonic crystals with self-simulating structures that possess a complete band gap in the visible range is developed. Achieving complete band gaps by this technique can use the common holographic recording materials with low refractive index rather than the materials with high refractive index. The width of the band gap obtained reaches 120 nm.