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Article
Thermodynamics
Jize Wu et al.
Summary: This paper proposes a composite multilayer structure consisting of a Weyl semimetal film and photonic crystal with a defect layer to achieve nonreciprocal thermal radiation with high quality factor. The high quality factor is a result of strong coupling between Tamm plasmon and defect mode. The nonreciprocal thermal radiation has a quality factor as high as 221.27 at a wavelength of 9.736 μm. The magnetic field distribution and reflection spectrum are shown to reveal the physical mechanism. The splitting in the absorption and emission spectrum with different defect layer thicknesses confirms the strong coupling between Tamm plasmon and defect mode. These results provide a new approach for nonreciprocal thermal radiation applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Min Luo et al.
Summary: Researchers have constructed a multilayer structure using Weyl semimetal materials, which can achieve an almost-complete violation of Kirchhoff's law at a specific incident angle. By adjusting parameters such as thickness, incident angle, and axial vector, an almost complete violation can be achieved over a wide range of angles and wavelengths, providing a practical design scheme for constructing strongly nonreciprocal thermal emitters.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
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
Materials Science, Multidisciplinary
Zi-Han Guo et al.
Summary: In this study, a novel direction-dependent Janus metasurface supported by waveguide structure and surface plasmon polariton modes is proposed. It enables low-frequency polarization conversion and ultrawideband absorption in different directions, as well as a fixed direction-independent transparent window. The favorable properties of this structure offer potential practical applications in electromagnetic wave control and radar stealth technology fields.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Thermodynamics
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)
Article
Thermodynamics
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
Optics
Shiyu Shen et al.
Summary: In this study, a graphene-based dielectric metasurface is proposed, which can achieve single-band to multi-band perfect absorption in the near-infrared range with independent band selectivity. This hybrid structure has a simple configuration and can be easily controlled by tuning the geometry of the system.
OPTICS COMMUNICATIONS
(2023)
Article
Thermodynamics
Zihe Chen et al.
Summary: Violating Kirchhoff's radiation law by using magneto-optical materials or spatiotemporal (Floquet) meta-materials allows for engineering thermal radiation with unequal spectral absorptivity (alpha) and emissivity (epsilon). This work presents a machine-learning-kernel-based algorithm framework that achieves four-band nonreciprocal thermal radiation using magneto-optical materials. The realization of multi-band nonreciprocity is attributed to the coupling effect of magneto-optical effect and the excitation of cavity modes with different orders. This research offers a general design roadmap for nonreciprocal thermal radiation and can be extended to design metamaterials beyond thermal metamaterials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(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
Thermodynamics
Jun Wu et al.
Summary: This study introduces a dual-band nonreciprocal thermal emitter achieved by utilizing the magneto-optical material and the coupling effect of two optical Tamm states (OTSs). The emitter exhibits near-complete dual-channel nonreciprocal thermal radiation at the wavelengths of 15.337 μm and 15.731 μm, assisted by the nonreciprocity of the magneto-optical material and the coupling effect of two OTSs for an external magnetic field of 3T and an incident angle of 56 degrees. The work may open the way for constructing dual-band and multi-band nonreciprocal thermal emitters.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Energy & Fuels
Jun Wu et al.
Summary: A polarization-insensitive broadband and wide-angle solar absorber has been proposed, which achieves high absorption in the visible to near-infrared regions with stable performance at different viewing angles and certain dimensional tolerance. It has potential applications in solar energy capturing and conversion, thermo-photovoltaic devices and thermal emitters.
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
Physics, Multidisciplinary
Jia Qu et al.
Summary: In this paper, an innovative multitasking device regulated by the gravity field is proposed, which can perform the functions of metamaterial absorber and linear polarization converter. The device achieves high absorption rate and wide bandwidth in the absorber state, and it can realize polarization conversion of the incident beam in the converter state through gravity field regulation.
ANNALEN DER PHYSIK
(2022)
Article
Chemistry, Physical
Chunlei Sun et al.
Summary: In this work, a near-perfect metamaterial solar absorber with broadb-and, wide angle, polarization insensitivity, and high-temperature resistance is proposed and investigated. The absorber achieves an average absorption of 97.6% in the spectral range of 300-2500 nm and maintains high absorption performance at large angles of solar radiation and polarization insensitivity. The research indicates that this work will benefit the design and application of solar thermal conversion and thermophotovoltaic systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
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
Thermodynamics
Jun Wu et al.
Summary: The enhanced nonreciprocal radiation effect is investigated in a Weyl semimetal-dielectric multilayer structure. It is found that the effect is achieved at the wavelength of 10 μm and an incident angle of 30°. The nonreciprocity increases with increasing angle of incidence. The designed thermal emitter maintains excellent radiation performance within a wide range of thicknesses, reducing fabrication costs and benefiting potential applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Jun Wu et al.
Summary: This article designs and studies a polarization insensitive, broadband and wide-angle perfect metamaterial absorber for solar energy harvesting, which has high absorption rate and large fabrication tolerance. The absorption spectra are consistent with solar spectrum and robust against incident angle changes.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Optics
Siyuan Liao et al.
Summary: This article proposes a metastructure device that utilizes the photoconductivity effect to achieve polarization conversion and absorption function switching in the terahertz range. By adjusting the intensity of light and the structure of the dielectric substrate, efficient polarization conversion and broadband absorption are realized.
Article
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
(2022)
Article
Materials Science, Multidisciplinary
Mohammad Alidoust et al.
Summary: From a low-energy effective Hamiltonian model, we calculated the dynamical optical conductivity and permittivity tensor of a magnetized graphene layer with Rashba spin-orbit coupling. Our results reveal that the magnetization and SOC can be identified experimentally by two well-separated peaks in the dynamical optical response. Furthermore, our calculations show that the magnetized spin-orbit coupled graphene supports strong handedness-switchings.
Article
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.
Article
Materials Science, Multidisciplinary
Jun Wu et al.
Summary: A novel thermal emitter capable of strong dual-band nonreciprocal radiation has been designed in this paper. Numerical results show promising performance under specific conditions, with robustness against geometric dimensions.
Review
Nanoscience & Nanotechnology
Ying Li et al.
Summary: This review provides a unified perspective on heat transfer control, summarizing complementary paradigms towards the manipulation of physical parameters at different length scales. Thermal conduction and radiation are emphasized in the first two parts, while the third part discusses efforts to actively introduce heat sources or tune material parameters with multiphysical effects.
NATURE REVIEWS MATERIALS
(2021)
Article
Optics
Baofei Wan et al.
Summary: A nonreciprocal absorber with a narrow band of angular polarization sensitive regions is studied in a quasi-periodic structure (QPS) containing InSb. The effectiveness of antireflection layers (ALs) allows the overall structure impedance to match the vacuum wave impedance, creating an absorption band in the photonic bandgap. The QPS has a larger frequency bandwidth and angular selective range compared to periodic structures, and its polarization separation and nonreciprocal ability can be regulated by temperature and magnetic induction intensity.
Article
Optics
Xiaohu Wu et al.
Summary: Kirchhoff's law is crucial in radiation heat transfer and has recently been extended to apply to nonreciprocal materials. A magnetophotonic crystal has been proposed to achieve strong nonreciprocal radiation at small angles, potentially verifying Kirchhoff's law for nonreciprocal materials.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Nanoscience & Nanotechnology
Xiaohu Wu et al.
Summary: Recent studies have shown the potential of Weyl semimetals in verifying Kirchhoff's law, but current designs fall short in achieving perfect nonreciprocal radiation. A new design using attenuated total reflection demonstrates perfect nonreciprocal radiation at a shorter wavelength and smaller angle, with a significant difference in directional emissivity and absorptivity. This design shows promise in experimenting with nonreciprocal materials and Kirchhoff's law.
Article
Chemistry, Multidisciplinary
Bo Zhao et al.
Article
Optics
Zhuomin M. Zhang et al.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2020)
Article
Optics
Sijia Guo et al.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2020)
Article
Multidisciplinary Sciences
Xiaochao Tan et al.
NATURE COMMUNICATIONS
(2020)
Article
Physics, Multidisciplinary
Chinmay Khandekar et al.
NEW JOURNAL OF PHYSICS
(2020)
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Xing Wang et al.
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Tiago A. Morgado et al.
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Yoichiro Tsurimaki et al.
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Ye Ming Qing et al.
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Ye Ming Qing et al.
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Bo Zhao et al.
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Multidisciplinary Sciences
Ying Li et al.
NATURE COMMUNICATIONS
(2018)
Article
Multidisciplinary Sciences
Xiya Zhu et al.
SCIENTIFIC REPORTS
(2018)
Article
Optics
Lei Zhao et al.
Article
Materials Science, Multidisciplinary
Liang Peng et al.
ADVANCED OPTICAL MATERIALS
(2018)
Article
Automation & Control Systems
Xiaofan Wu et al.
SYSTEMS & CONTROL LETTERS
(2017)
Article
Multidisciplinary Sciences
Po-Chun Hsu et al.
Article
Optics
Ting-Hui Xiao et al.
PHOTONICS RESEARCH
(2015)
Article
Materials Science, Multidisciplinary
Linxiao Zhu et al.
