Fabrication of planar photonic crystals in a chalcogenide glass using a focused ion beam

Free-standing AMTIR-1 (Ge33As12Se55) chalcogenide glass films have been patterned using a focused ion beam ( FIB) to create two-dimensional photonic crystal membranes. The triangular lattices were selected for a photonic bandgap relevant to fiber telecommunications. Optical measurements of transmission spectra as a function of incident angle showed clear signs of Fano resonances, indicating that the structures had strongly modified guided modes. (C) 2005 Optical Society of America.