Modulating electromagnetic properties in three-dimensional diamond-structured photonic crystals with double planar defects

Three-dimensional (3D) diamond structure photonic crystals (PhCs) with planar defects were fabricated with alumina using 3D printing combining gel casting, sintering process, and vacuum freezing-dry technique. In this article, the influences of twinned planar defect and the positions of planar defect in a single lattice period on the transmission properties of the electromagnetic wave (EM) in the PhCs is studied. The normalized resonant intensities are 0.5 for twinned planar defected photonic crystals (PhCs). When the planar defect position lies in the nonkey positions (key position is n*(a/4)), the band gap becomes narrow and the resonant peak disappears. When the twinned planar defected with different interval periods is integer, obvious resonant peaks can be found in the EM band gap of the planar defects PhCs with 2 and 3 symmetrical periods. When a PhC with two planar defects is constructed, its band gap width increases and the resonant peaks intensities decrease.