Mesoscopic Photonic Crystals Made of TiO_2 Hollow Spheres Connected by Cylindrical Tubes

摘要

The face-centered cubic (fcc) photonic crystals of titanium dioxide (TiO_2) hollow spheres connected by TiO_2 cylindrical tubes have been fabricated using silica template.The preparation process is based on the vertical deposition method,thermal sintering and selective etching techniques.In the crystal,the lowest energy pseudogaps at points U and K of the Brillouin zone have been opened.