Photonic Crystal Research - Group at MIT. The Photonic Band Gap - Research group, part of condensed matter physics, Ames Laboratory, Iowa State University. PECS-IV: International Workshop on Photonic and Electromagnetic Crystal Structures - Institute for Pure and Applied Mathematics, UCLA, Los Angeles, California, USA; 28--31 October 2002. Photonic Bandgap Fibers & Devices Group - Photonic bandgap optical fiber research at MIT Photonic and Sonic Band Gap Bibliography - Reference bibliography for papers on optical and acoustic photonic band gaps. Photonic Crystals Group ICMM - Classical waves crystals, photonic crystals, sonic crystals, opals; Madrid, Spain.