论文信息: Jun Wu*, Yasong Sun, Biyuan Wu and Xiaohu Wu*, Strong Nonreciprocal Mid-infrared Radiation at Small Angles Based on the Excitation of Guided Modes, Engineered Science, 10.30919/es8d650 (2022). 研究背景 非互易材料可以打破传统的基尔霍夫定律,即方向光谱吸收率不等于发射率,此外,已有工作证明非互易辐射有望克服光伏的肖克利-奎瑟(SQ)极限,因此磁光材料和Weyl半金属等非互易材料得到了学术界的广泛关注与研究。为了证明非互易材料的基尔霍夫定律,需要准确地测量热发射率。根据兰贝特定律,热发射信号在较小的角度下较大,因此,在较小角度实现强非互易热辐射将增强热发射信号,这有利于非互易材料的基尔霍夫定律实验验证。如何在小角度下实现强非互易热辐射,是目前学界重点关注的一个研究方向。 研究内容 图1. 实现接近完美非互易热辐射的结构示意图 图2. B=0和2 T时θ=12°的(a) 吸收光谱和(b) 发射光谱 图3. (a)θ=12°和(b)θ=-12°时的|Hy/H0|分布 图4. 2 T磁场下θ=12°的吸收光谱数值模拟和理论值分析 图5. 吸收率与发射率随:(a) 结构周期,(b) 条带宽度,(c) 光栅厚度和(d ) InAs薄膜厚度的变化。 图6. 在波长15.5 μm处,吸收率和发射率随入射角的变化 结论与展望 综上所述,本文研究了一种由金属光栅、InAs间隔片和底部金属反射镜组成的新型结构的增强非互易热辐射效应。在外加磁场2T时,在12°入射角下可以实现接近完美的非互易热辐射。利用标准化磁场大小的分布和耦合模式理论揭示了其物理机制。此外,还详细研究了几何尺寸和入射角度对辐射的影响。本文为在小角度下工作的非互易热发射器的设计提供了一种新的方法,为广义基尔霍夫定律的证明提供了理论依据。 吴小虎团队在非互易热辐射方向的成果如下: 1. Zhuomin Zhang*, Xiaohu Wu, and Ceji Fu, Validity of Kirchhoff’s las for semitransparent films made of anisotropic materials, Journal of Quantitative Spectroscopy & Radiative Transfer 245, 106904 (2020). 2. Xiaohu Wu*, The promising structure to verify the Kirchhoff’s law for nonreciprocal materials, ES Energy & Environment 12, 46-51 (2021). 3. Xiaohu Wu*, Zhaoxian Chen, and Feng Wu, Strong Nonreciprocal Radiation in a InAs Film by Critical Coupling with a Dielectric Grating, ES Energy & Environment 13 ,8-12 (2021). 4. Xiaohu Wu*, Ruiyi Liu, Haiyan Yu, and Biyuan Wu, Strong nonreciprocal radiation in magnetophotonic crystals, Journal of Quantitative Spectroscopy and Radiative Transfer 272, 107794 (2021). 5. Xiaohu Wu*, Haiyan Yu, Feng Wu, and Biyuan Wu, Enhanced nonreciprocal radiation in Weyl semimetals by attenuated total reflection, AIP Advances 11, 075106 (2021). 6. Jun Wu*, Feng Wu, Xiaohu Wu*, Strong dual-band nonreciprocal radiation based on a four-part periodic metal grating, Optical Materials 120, 111476 (2021). 7. Jun Wu*, Feng Wu, Tiancheng Zhao, Han Zhai, and Xiaohu Wu*, Nonreciprocal Thermal Radiation Based on Fibonacci Quasi-Periodic Structures, 2021, Engineered Science (DOI: 10.30919/es8d575). 8. Jun Wu, Zhongmin Wang, Han Zhai, Zhangxing Shi, Xiaohu Wu*, and Feng Wu*, Near-complete violation of Kirchhoff s law in thermal radiation in ultrathin magnetic Weyl semimetal films, Optical Materials Express, 11, 4058-4066 (2021). 9. Jun Wu*, Feng Wu, Tiancheng Zhao, and Xiaohu Wu*, Tunable nonreciprocal thermal emitter based on metal grating and graphene, International Journal of Thermal Sciences 172, 107316 (2022). 10. Jun Wu*, Feng Wu, Tiancheng Zhao, Mauro Antezza, and Xiaohu Wu*, Dual-band nonreciprocal thermal radiation by coupling optical Tamm states in magnetophotonic multilayers, International Journal of Thermal Sciences 175, 107457 (2022). 11. Jun Wu*, Yasong Sun, Biyuan Wu, and Xiaohu Wu*, Strong nonreciprocal mid-infrared radiation at small angles based on the excitation of guided modes, Engineered Science, 10.30919/es8d650 (2022). |
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