Abstract

With experimentally matched dielectric properties for an Ag layer, it is shown that the optical characteristic of the $\mathrm{Ag}/{\mathrm{SiO}}_2$ filter has been seriously overestimated from the simple Drude dispersion, and the expected spectrum efficiency is only a half of that for the Drude model. Importantly, increasing the number of $\mathrm{Ag}\text{-}{\mathrm{SiO}}_2$ units hampers the spectrum efficiency, uncovering thus the breakdown of photonic bandgap effect in dominating the performance of the $\mathrm{Ag}/{\mathrm{SiO}}_2$ filter. With a simple sandwich profile, the $\mathrm{Ag}/{\mathrm{SiO}}_2$ filter can achieve spectrum efficiency of 37% while holding the effective above-bandgap transmission up to 60%, which is also comparable with that for the classical $\mathrm{Si}/{\mathrm{SiO}}_2$ photonic crystal filter, providing thus a flexible strategy to develop the simple yet efficient optical filter for thermophotovoltaic applications.

© 2018 Optical Society of America

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