Related references
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Article
Physics, Applied
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Summary: The reciprocity between thermal emission and absorption in materials poses a fundamental constraint on photonic energy conversion and thermal management. To overcome this limitation and achieve broadband nonreciprocal thermal emission, a gradient epsilon-near-zero magneto-optical metamaterial is introduced. Numerical demonstrations show the effectiveness of this approach for developing broadband nonreciprocal devices for energy conversion and thermal management.
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Summary: The recent review highlights the need to achieve near-complete nonreciprocal radiation with extremely small incidents near to normal incidence, as the existing designs are limited by large incident angles. To overcome this constraint, a novel structure based on a metal-magneto-optical material double-layer grating is designed and studied. The results demonstrate near-unity absorptivity and very small emissivity at the same wavelength, leading to enhanced nonreciprocal radiation for an incident angle of only 1 degree. The research also investigates the influence of structure dimensions and the possibility of realizing near-perfect nonreciprocity.
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Article
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Summary: The recent study highlights the limitation of existing nonreciprocal emitters due to their small angular range occurring at large angles. To overcome this challenge, a novel scheme based on a cascaded dielectric-magneto-optical material grating structure is proposed and investigated. The results show that near-unity emission and little absorption can be achieved at the same wavelength, leading to near-perfect nonreciprocal radiation at an angle of only 1 degree. The underlying physical mechanism is revealed through the distribution of magnetic field amplitude. Additionally, the possibility of achieving strong nonreciprocity with a minimal magnetic field is explored, and the achievable angular ranges of the proposed scheme are investigated. These findings are significant for the advancement of solar cells, photovoltaics, and thermal devices with improved efficiency.
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Summary: By sandwiching a graphene monolayer between a top metallic grating and a bottom magneto-optical film backed with a metallic mirror, tunable nonreciprocal radiation effect has been achieved. The nonreciprocal radiation performance remains perfectly within certain range of structure parameters, which is beneficial for practical fabrication and applications. The proposed scheme allows for flexible tuning of nonreciprocal radiation by the gate voltage of graphene without the need for redesigning and refabricating the structure.
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Article
Optics
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Article
Thermodynamics
N. Acharya et al.
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Article
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M. Q. Liu et al.
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(2022)
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Komron J. Shayegan et al.
Summary: In this study, we broke time-reversal symmetry and reciprocity in n-type-doped magneto-optic InAs with a static magnetic field. Using a guided-mode resonator structure, we observed nonreciprocal absorptive behavior in the infrared, providing a new avenue for designing devices with unequal absorptivity and emissivity.
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Summary: This study introduces a nonreciprocal thermophotovoltaic system consisting of multiple nonreciprocal photovoltaic layers, which can achieve Carnot efficiency while generating nonzero power. Nonreciprocity in thermophotovoltaic systems has the potential to significantly outperform their reciprocal counterparts.
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Zhenong Zhang et al.
Summary: This article discusses the importance of breaking Lorentz reciprocity to achieve photonic energy conversion and control of thermal transfer. It reviews different approaches to achieving nonreciprocal emission and absorption, as well as radiative heat transfer phenomena in nonreciprocal materials.
PHYSICAL REVIEW APPLIED
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Tianji Liu et al.
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Xingqiao Chen et al.
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