With experimentally matched dielectric properties for an Ag layer, it is shown that the optical characteristic of the 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 units hampers the spectrum efficiency, uncovering thus the breakdown of photonic bandgap effect in dominating the performance of the filter. With a simple sandwich profile, the 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 photonic crystal filter, providing thus a flexible strategy to develop the simple yet efficient optical filter for thermophotovoltaic applications.
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