Abstract
The photonic structure of a two-dimensional square lattice with square columns rotated by 45° is theoretically studied. For a range of dielectric filling factors around f 50.5 ~for which the lattice reduces to a chessboard! a photonic band gap common to s and p polarizations is found. The complete band gap occurs for a wide range of values of the dielectric contrast and is maximum for relatively low values of the contrast.
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