Abstract

We describe chalcogenide glass and polymer based Bragg reflectors with a metallic underlayer and use a transfer matrix model to analyze their performance. The angle-averaged reflectance of a hybrid mirror approaches unity for only a few periods and is much higher than that for a nonmetallized Bragg reflector or for the metallic layer alone. For an angle-averaged reflectance greater than 0.99, the addition of a metallic underlayer enables nearly a tripling of the omnidirectional bandwidth (from $\sim 110$ to $\sim 305\text{\hspace{0.17em} nm}$) concurrent with a significant reduction in the number of required periods (from 10.5 to 4.5). Hybrid mirrors of 4.5 periods, with a $50\text{\hspace{0.17em} nm}$ Au underlayer and overall thickness of $\sim 2\text{\hspace{0.17em} μm}$, were fabricated atop silicon substrates and characterized. They exhibit an omnidirectional stop band in the $1450–1750\text{\hspace{0.17em} nm}$ wavelength range, in good agreement with theoretical predictions.

© 2007 Optical Society of America

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