Gallium Arsenide Infiltration of Nanoporous Multilayers: A Route to High‐Dielectric‐Contrast One‐Dimensional Photonic Crystals

Periodic multilayers of wide photonic bandgap and high reflectance in the visible and near infrared regions are fabricated. Optical properties show that reflectance intensities close to 90% are reached for stacks of only six layers, as well as gap-to-midgap ratios of 50%. The optical response of the hybrid ensemble can be accurately tuned through the number of infiltration cycles performed.