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We demonstrate that one-dimensional photonic crystal structures (such as multilayer f ilms) can exhibit complete ref lection of radiation in a given frequency range for all incident angles and polarizations. We derive a general criterion for this behavior that does not require materials with very large indices. We perform numerical studies that illustrate this effect.doi:10.1364/ol.23.001573 pmid:18091848 fatcat:dqcqrdrxebaddnxmheslqif3sa