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Narrowband mid-infrared absorber based on a mirror-backed low-index dielectric lattice

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Abstract

This paper reports the design of a narrowband mid-infrared absorber using a structure consisting of low-index dielectric pillar arrays on a highly reflective metal plane. Such a hybrid system can support a high-quality lattice resonance with strongly confined electromagnetic fields at the tops of dielectric structures. For mid-infrared wavelengths around 4 µm, the low-index dielectric can be silica by plasma-enhanced chemical vapor deposition, and the metal can be copper. The lattice resonance can lead to perfect absorption with a quality factor around 1000 when considering realistic dissipative losses for the low-index dielectric pillars. According to Kirchhoff’s radiation law, the narrowband absorber can work as a high-$Q$ surface-emitting thermal emitter in the mid-infrared by heating its substrate.

© 2021 Optical Society of America

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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