Lattice modification of photonic crystals

Abstract

Three-dimensional photonic crystals with periodic variation of dielectric constant were fabricated by rapid prototyping method called stereolithography. Millimeter-order epoxy lattices with a diamond structure were designed to reflect electromagnetic waves by forming an electromagnetic bandgap in the GHz range. We tried to control the bandgap position by changing the volume fraction of dielectric medium from 14∼86%. The band diagram was calculated by means of plain wave expansion method.