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The real and imaginary photonic band structure of modes attached to two-dimensionally textured semiconductor membranes is determined experimentally and theoretically. These porous waveguides exhibit large (1000 cm^-1 at 9500 cm^-1) second-order optical gaps, highly dispersive lifetimes, and bands with well-defined polarization along directions of high symmetry.
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Pacradouni et al. (2000) studied this question.
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