COMPLEX PHOTONIC BAND STRUCTURES OF A CONDUCTIVE METAL LATTICE BY A QUADRATIC EIGENSYSTEM

For conductive periodic media, Maxwell's equations can be transformed into quadratic eigensystems by tile plane-wave expansion method. We co mputed complex photonic band structures for the two-dimensional square lattice with conductive cylinders by solving the quadratic eigensyste m. The photonic band structures obtained for metal cylinders with fini te conductivity closely resemble those computed for perfectly conducti ve cylinders by a real space finite-difference method. However, some m odes can become unphysical in the finitely conductive metal lattice. ( C) 1995 Optical Society of America