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

Physics

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

K. Sun, Y. Cai, et al.

Discover a groundbreaking flat band design that enables thermal emissions with exceptional temporal coherence while overcoming the notorious rainbow effect found in conventional narrowband thermal emitters. This innovative approach, demonstrated by Kaili Sun, Yangjian Cai, Lujun Huang, and Zhanghua Han, introduces geometric perturbations within a high-index disk lattice, achieving impressive results.

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Playback language: English
Abstract
This work proposes a novel flat band design within a large range of wavevectors to realize thermal emissions with high temporal coherence but free from the rainbow effect, a common issue in narrowband thermal emitters using photonic nanostructures. Geometric perturbations are introduced into a square lattice of high-index disks, doubling the period along one direction. This results in a flat band dispersion with high Q, experimentally demonstrated with a linewidth of 23 nm at 5.144 μm over a wide range of output angles.
Publisher
Nature Communications
Published On
May 13, 2024
Authors
Kaili Sun, Yangjian Cai, Lujun Huang, Zhanghua Han
Tags
flat band design
thermal emissions
temporal coherence
photonic nanostructures
high-Q
geometric perturbations
linewidth
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