Strong nonreciprocal thermal radiation in Weyl semimetal-dielectric multilayer structure

Wu, Jun; Wu, Biyuan; Wang, Zhongmin; Wu, Xiaohu

doi:10.1016/j.ijthermalsci.2022.107788

Cited by 30 publications

(7 citation statements)

References 45 publications

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“…Compared to other multilayer WSM designs, the nonreciprocity of our work is somewhat lower [24,26,27]. However, the nonreciprocity in these works is very narrowband and require far more layers than the designs proposed here.…”

Section: Resultsmentioning

confidence: 78%

“…Violation of Kirchhoff's Law of thermal radiation has been shown in WSM thin films over a metallic substrate [23]. Multilayer photonic crystal designs using many WSMs layers have also been proposed to enhance nonreciprocity [24,25]. Moreover, optical Tamm states formed by multilayer WSM-based photonic crystals have been shown to enhance nonreciprocity [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Broadband and wide angle nonreciprocal thermal emission from Weyl semimetal structures

Butler¹,

Argyropoulos²

2023

J. Opt. Soc. Am. B

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Nonreciprocal thermal emission is a cutting-edge technology that enables fundamental control over thermal radiation and has exciting applications in thermal energy harvesting. However, thus far one of the foremost challenges is making nonreciprocal emission operate over a broad wavelength range and for multiple angles. In this work, we solve this outstanding problem by proposing three different types of structures that always utilize only one Weyl semimetal (WSM) thin film combined with one or two additional dielectric or metallic layers and terminated by a metallic substrate. First, a tradeoff relationship between the magnitude and bandwidth of the thermal nonreciprocity contrast is established based on the thickness of the WSM film. Then, the bandwidth broadening effect is demonstrated via the insertion of a dielectric spacer layer that can also be fine-tuned by varying its thickness. Finally, further control on the resulting strong nonreciprocal thermal radiation is demonstrated by the addition of a thin metallic layer in the proposed few layer designs. The presented composite structures work for a broad frequency range and for multiple emission angles, resulting in highly advantageous properties for various nonreciprocal thermal radiation applications. Moreover, the proposed designs do not require any patterning and can be experimentally realized by simple deposition fabrication methods. They are expected to aid in the creation of broadband nonreciprocal thermal emitters that can find applications in new energy harvesting devices.

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Broadband and wide angle nonreciprocal thermal emission from Weyl semimetal structures

Butler¹,

Argyropoulos²

2023

J. Opt. Soc. Am. B

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“…Such an ideal WSM has been experimentally realized very recently. The permittivity tensor of the WSM is written as [31,32]:…”

Section: Model and Theoretical Methodsmentioning

confidence: 99%

Actively tunable weak and strong couplings in epsilon-near-zero ultrathin film-based Weyl semimetallic photonic crystals

Sun¹,

Qian²,

Ye³

et al. 2023

J. Opt.

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Lithography-free layered dielectric media play an important role in photonic platforms and open up new possibilities in the design of devices with large-scale compatibilities. In this work, we propose a hybrid structure consisting of phononic thin layer and Weyl semimetallic photonic crystals (WSMPhCs). Manipulation of electromagnetic (EM) waves and the interactions between different optical modes are presented, which is highly demanded for both fundamental research and practical applications. The weak and strong coupling effects result in hybrid polariton modes, of which the dispersion can be quantitatively described by a coupled harmonic oscillator (CHO) model. In the Kretschmann coupling proposal, when the incident angle is smaller than the critical angle ($\theta_c$=25$^{\circ}$) of total internal reflection, a weak coupling is generated. However, when the incident angle is larger than $\theta_c$, anticrossing resluts from strong coupling can be observed. We believe that the use of easily manufactured WSM elements and the tunable hybridization of multiple optical modes will enable the manipulation of light-matter interactions with more flexibility in the mid-infrared (MIR) range, and can significantly improve the functional properties of various devices.

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“…Tsurimaki et al investigated the effect of the Fermi-arc surface state and the number of Weyl nodes for Weyl semimetal-based nonreciprocal thermal emitters [15,16]. Wu et al construct nonreciprocal thermal emitters using Weyl semimetal thin films [273][274][275]. Since the nonreciprocal effect is intrinsic to the materials, these thermal emitters do not require any external magnetic field.…”

Section: Nonreciprocal Thermal Emittersmentioning

confidence: 99%

Light control with Weyl semimetals

Guo

Asadchy

Zhao

et al. 2023

eLight

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Weyl semimetals are topological materials whose electron quasiparticles obey the Weyl equation. They possess many unusual properties that may lead to new applications. This is a tutorial review of the optical properties and applications of Weyl semimetals. We review the basic concepts and optical responses of Weyl semimetals, and survey their applications in optics and thermal photonics. We hope this pedagogical text will motivate further research on this emerging topic.

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Strong nonreciprocal thermal radiation in Weyl semimetal-dielectric multilayer structure

Cited by 30 publications

References 45 publications

Broadband and wide angle nonreciprocal thermal emission from Weyl semimetal structures

Broadband and wide angle nonreciprocal thermal emission from Weyl semimetal structures

Actively tunable weak and strong couplings in epsilon-near-zero ultrathin film-based Weyl semimetallic photonic crystals

Light control with Weyl semimetals

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