Related references
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Article
Physics, Applied
Zhenong Zhang et al.
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.
PHYSICAL REVIEW APPLIED
(2023)
Article
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Jun Wu et al.
Summary: The study focuses on the perfect nonreciprocal radiation effect for extreme small incident angle. The proposed scheme involves a patterned magneto-optical (MO) material on a continuous MO film backed with a metallic mirror and coated with a metallic film. Near-complete nonreciprocal radiation is achieved at resonance with perfect emission and extreme small absorption for an incident angle of only 1o. This effect is attributed to the excitation of guided mode resonance in the MO material, which is confirmed by investigating the magnetic field intensity distribution and impedance matching theory. The scheme shows promising potential for improving energy conversion in various fields including solar cells and thermophotovoltaics.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
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Jize Wu et al.
Summary: A nonreciprocal emitter for TE wave is designed in this work, and the nonreciprocity can be effectively enhanced by tailoring the angle of the plane of incidence with respect to the Weyl nodes of WS. The physical mechanism of the strong nonreciprocal thermal radiation of TE incidence is revealed through the study of reflectivity for the co-polarization and cross-polarization. The variation of the absorptivity spectrum and emissivity spectrum with the thicknesses of Weyl semimetal film and angles are also shown.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Jun Wu et al.
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.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Thermodynamics
Jun Wu et al.
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.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Jun Wu et al.
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.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
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Yubin Park et al.
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Article
Optics
Chiyu Yang et al.
Summary: This study proposes a circular polarizer design with a double-WSM-layer structure, which exhibits high circular polarization efficiency and high average transmittance. The temperature dependence on the transmittance is also examined to demonstrate the flexibility of the proposed polarizer in varying temperature environments. Weyl semimetals show great potential as high-performance circular polarizers in infrared spectroscopy and polarimetry.
Article
Thermodynamics
N. Acharya et al.
Summary: This study investigates the magnetized mixed convective unsteady Ag/MgO-water hybrid nanofluid stream over a whirling sphere near the stagnation zone, treating nanofluid motion as thermally radiative. Results show that the hybrid nanofluid exhibits higher efficiency in terms of velocity, heat transport, and skin frictional profiles.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
M. Q. Liu et al.
Summary: This study demonstrates the achievement of nonreciprocal thermal radiation in the near-infrared region using dielectric/metal sandwich structures. The asymmetric resonant peaks in absorption or emission spectra are accurately predicted. The influence of various factors on asymmetric distributions is also discussed, providing new mechanisms and tunability for engineering nonreciprocal thermal radiation.
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(2022)
Article
Multidisciplinary Sciences
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.
Article
Nanoscience & Nanotechnology
Yubin Park et al.
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.
Article
Physics, Applied
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
(2022)
Article
Optics
Jun Wu et al.
Summary: In this study, the giant enhancement of the transverse magneto-optical Kerr effect (TMOKE) is investigated. It is achieved by depositing a multilayer structure on a metallic mirror, leading to near perfect TMOKE due to the excitation of Tamm plasmon polaritons (TPPs) between the multilayer structure and the metallic mirror. Additionally, the potential applications of this giant enhancement of TMOKE on sensing are illustrated.
OPTICS AND LASER TECHNOLOGY
(2022)
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Materials Science, Multidisciplinary
Kezhang Shi et al.
Summary: This paper proposes an ultra-high-directional nonreciprocal thermal emitter with a periodic structure of magneto-optical material, achieving a very small angular divergence. The nonreciprocal thermal emission is stable even with material loss and structural parameter fluctuation.
ADVANCED OPTICAL MATERIALS
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Optics
Tianji Liu et al.
Summary: This review discusses the physics and functionalities of nanophotonic structures with broken symmetries for controlling thermal emission, highlighting the role of symmetries in increasing the degree of freedom in systems and providing opportunities for novel applications. The article also outlines various physical phenomena, interesting applications, and future developments in the field.
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Chemistry, Physical
Xingqiao Chen et al.
Summary: This paper proposed an optical nonlinear metasurface based on monolayer graphene integrated silicon resonant gratings, which can excite high-Q guided mode resonances in the communication band and achieve significant optical Kerr effect. By changing the parameters of the grating, the nonlinear effect can be effectively controlled to realize different applications. Furthermore, remarkable non-reciprocity phenomenon is realized at a certain incident intensity, allowing the implementation of an optical diode.
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Yubin Park et al.
Summary: This study presents a novel emitter design that can fully absorb incident energy from a specific direction with zero backward and unity forward emissivity. The nearly ideal performance is achieved through the magneto-optical effect and guided-mode resonance engineered in the emitter structure.
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