Ultra-broadband directional thermal emission

Directional control of thermal emission over its broad wavelength range is a fundamental challenge. Gradient epsilon-near-zero (ENZ) material supporting Berreman mode has been proposed as a promising approach. However, the bandwidth is still inherently limited due to the availability of ENZ material...

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Published in:Nanophotonics (Berlin, Germany) Germany), 2024-03, Vol.13 (5), p.793-801
Main Authors: Wang, Qiuyu, Liu, Tianji, Li, Longnan, Huang, Chen, Wang, Jiawei, Xiao, Meng, Li, Yang, Li, Wei
Format: Article
Language:English
Subjects:
Bandwidths
Broadband
broadband directional thermal emission
Directional control
Effective medium theory
Efficiency
Emitters
Laboratories
metamaterial
Multilayers
Neutrons
Photonics
Physics
Radiation
Thermal emission
Thermal utilization
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cited_by cdi_FETCH-LOGICAL-c4613-b26ae61e3f1033c0eace51804bc81caa300ffe9928e64eb7076d42617ecff7d03
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container_title Nanophotonics (Berlin, Germany)
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creator Wang, Qiuyu
Liu, Tianji
Li, Longnan
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Wang, Jiawei
Xiao, Meng
Li, Yang
Li, Wei
description Directional control of thermal emission over its broad wavelength range is a fundamental challenge. Gradient epsilon-near-zero (ENZ) material supporting Berreman mode has been proposed as a promising approach. However, the bandwidth is still inherently limited due to the availability of ENZ materials covering a broad bandwidth and additional undesired omnidirectional modes in multilayer stacking with increased thickness. Here, we show that broadband directional thermal emission can be realized beyond the previously considered epsilon-near-zero and Berreman mode region. We then establish a universal approach based on effective medium theory to realizing ultra-broadband directional thermal emitter. We numerically demonstrate strong (emissivity >0.8) directional (80 ± 5°) thermal emission covering the entire thermal emission wavelength range (5–30 μm) by using only two materials. This approach offers a new capability for manipulating thermal emission with potential applications in high-efficiency information encryption, energy collection and utilization, thermal camouflaging, and infrared detection.
doi_str_mv 10.1515/nanoph-2023-0742
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source Publicly Available Content Database; De Gruyter Open Access Journals; PubMed Central
subjects Bandwidths
Broadband
broadband directional thermal emission
Directional control
Effective medium theory
Efficiency
Emitters
Laboratories
metamaterial
Multilayers
Neutrons
Photonics
Physics
Radiation
Thermal emission
Thermal utilization
title Ultra-broadband directional thermal emission
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