Ultra-narrowband and rainbow-free mid-infrared thermal emitters enabled by a flat band design in distorted photonic lattices

Kaili Sun, Yangjian Cai, Lujun Huang () and Zhanghua Han ()
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Kaili Sun: Shandong Normal University
Yangjian Cai: Shandong Normal University
Lujun Huang: East China Normal University
Zhanghua Han: Shandong Normal University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Most reported thermal emitters to date employing photonic nanostructures to achieve narrow bandwidth feature the rainbow effect due to the steep dispersion of the involved high-Q resonances. In this work, we propose to realize thermal emissions with high temporal coherence but free from rainbow effect, by harnessing a novel flat band design within a large range of wavevectors. This feature is achieved by introducing geometric perturbations into a square lattice of high-index disks to double the period along one direction. As a result of the first Brillouin zone halving, the guided modes will be folded to the Γ point and interact with originally existing guided-mode resonances to form a flat band of dispersion with overall high Q. Despite the use of evaporated amorphous materials, we experimentally demonstrate a thermal emission with the linewidth of 23 nm at 5.144 μm within a wide range of output angles (from −17.5° to 17.5°).

Date: 2024
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DOI: 10.1038/s41467-024-48499-4

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