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21 September 2007 Aperiodic metal-dielectric optical filters
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We report on the design and fabrication of metal-dielectric photonic band-gap structures (MDPBGs) with high transmission and broad spectral bandwidth in the visible range. Using the complex refractive index measured by spectroscopic ellipsometry, we have designed structures with an aperiodic thickness distribution which show a flat passband transmission (64% ± 1.5%) over more than 150 nm within the visible spectrum. Using e-beam deposition, we demonstrate the growth of continuous 12 nm Ag layers on Al2O3, and MDPBGs with five periods of Al2O3/Ag/Al2O3 that show more than 49% ± 2.5% transmission and at least 150 nm bandwidths. When compared to dielectric-dielectric stacks, the use of metallic layers provides excellent out-of-band rejection, in particular beyond the IR edge where the MDPBG acts collectively as a metallic solid. Such structures could thus be used as hot mirrors with extremely high and broad out-of-band rejection.
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Daniel Owens, Canek Fuentes-Hernandez, and Bernard Kippelen "Aperiodic metal-dielectric optical filters", Proc. SPIE 6674, Thin-Film Coatings for Optical Applications IV, 667404 (21 September 2007);

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