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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