Heat transfer control using a thermal analogue of coherent perfect absorption

Ying Li (), Minghong Qi, Jiaxin Li, Pei-Chao Cao, Dong Wang, Xue-Feng Zhu, Cheng-Wei Qiu () and Hongsheng Chen ()
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Ying Li: Zhejiang University
Minghong Qi: Zhejiang University
Jiaxin Li: Harbin Institute of Technology
Pei-Chao Cao: Huazhong University of Science and Technology
Dong Wang: Zhejiang University
Xue-Feng Zhu: Huazhong University of Science and Technology
Cheng-Wei Qiu: National University of Singapore
Hongsheng Chen: Zhejiang University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Recent investigations on non-Hermitian physics have unlocked new possibilities to manipulate wave scattering on lossy materials. Coherent perfect absorption is such an effect that enables all-light control by incorporating a suitable amount of loss. On the other hand, controlling heat transfer with heat may empower a distinct paradigm other than using thermal metamaterials. However, since heat neither propagates nor carries any momentum, almost all concepts in wave scattering are ill-defined for steady-state heat diffusion, making it formidable to understand or utilize any coherent effect. Here, we establish a scattering theory for heat diffusion by introducing an imitated momentum for thermal fields. The thermal analogue of coherent perfect absorption is thus predicted and demonstrated as the perfect absorption of exergy fluxes and undisturbed temperature fields. Unlike its photonic counterpart, thermal coherent perfect absorption can be realized for regular thermal materials, and be generalized for various objects.

Date: 2022
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DOI: 10.1038/s41467-022-30023-1

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