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One-dimensional photonic crystal (1D PC) mirrors consisting of Al2O3/TiO2 stacks are theoretically and experimentally investigated at visible frequencies. In our experiments the refractive index of Al2O3 is tunable from 1.43 to 1.68. We found that the Al2O3/TiO2 combination can be adopted to fabricate both broad- and narrow-band 1D PC mirrors: Substituting nanoporous Al2O3 for dense SiO2 in an SiO...
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