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Tunable Thermal Emission of Subwavelength Silica Ribbons
ACS Photonics ( IF 6.5 ) Pub Date : 2022-10-26 , DOI: 10.1021/acsphotonics.2c01183 Juan José García-Esteban 1 , Jorge Bravo-Abad 1 , Juan Carlos Cuevas 1
ACS Photonics ( IF 6.5 ) Pub Date : 2022-10-26 , DOI: 10.1021/acsphotonics.2c01183 Juan José García-Esteban 1 , Jorge Bravo-Abad 1 , Juan Carlos Cuevas 1
Affiliation
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The thermal properties of individual subwavelength objects, which defy Planck’s law, are attracting significant fundamental and applied interest in different research areas. Special attention has been devoted to anisotropic structures made of polar dielectrics featuring thicknesses smaller than both the thermal wavelength and the skin depth. Recently, a novel experimental technique has enabled the measurement of the thermal emissivity of anisotropic SiO2 nanoribbons (with thicknesses on the order of 100 nm), demonstrating that their emission properties can be largely tuned by adjusting their dimensions. However, despite the great interest aroused by these results, their rigorous theoretical analysis has remained elusive due to the computational challenges arising from the vast difference in the length scales involved in the problem. In this work, we present a systematic theoretical analysis of the thermal emission properties of these dielectric nanoribbons based on simulations within the framework of fluctuational electrodynamics carried out with the boundary element method implemented in the SCUFF-EM code. In agreement with the experiments, we show that the emissivity of these subwavelength structures can be largely tuned and enhanced over the thin-film limit. We elucidate that the peculiar emissivity of these nanoribbons is due to the very anisotropic thermal emission that originates from the phonon polaritons of this material and the properties of the waveguide modes sustained by these dielectric structures. Our work illustrates the rich thermal properties of subwavelength objects, as well as the need for rigorous theoretical methods that are able to unveil the complex thermal emission phenomena emerging in this class of systems.
中文翻译：
亚波长硅带的可调热发射
违反普朗克定律的单个亚波长物体的热特性正在吸引不同研究领域的重要基础和应用兴趣。特别关注由极性电介质制成的各向异性结构，其厚度小于热波长和趋肤深度。最近，一项新的实验技术已经能够测量各向异性 SiO 2的热发射率纳米带（厚度约为 100 nm），表明它们的发射特性可以通过调整其尺寸在很大程度上进行调整。然而，尽管这些结果引起了极大的兴趣，但由于问题所涉及的长度尺度的巨大差异所带来的计算挑战，他们严格的理论分析仍然难以捉摸。在这项工作中，我们基于波动电动力学框架内的模拟，对这些介电纳米带的热发射特性进行了系统的理论分析，这些模拟是在 SCUFF-EM 代码中实施的边界元法进行的。与实验一致，我们表明这些亚波长结构的发射率可以在很大程度上调整和增强超过薄膜极限。我们阐明了这些纳米带的特殊发射率是由于这种材料的声子极化激元产生的非常各向异性的热发射以及这些介电结构所维持的波导模式的特性。我们的工作说明了亚波长物体丰富的热特性，以及对能够揭示此类系统中出现的复杂热辐射现象的严格理论方法的需求。
更新日期：2022-10-26
中文翻译：
亚波长硅带的可调热发射
违反普朗克定律的单个亚波长物体的热特性正在吸引不同研究领域的重要基础和应用兴趣。特别关注由极性电介质制成的各向异性结构，其厚度小于热波长和趋肤深度。最近，一项新的实验技术已经能够测量各向异性 SiO 2的热发射率纳米带（厚度约为 100 nm），表明它们的发射特性可以通过调整其尺寸在很大程度上进行调整。然而，尽管这些结果引起了极大的兴趣，但由于问题所涉及的长度尺度的巨大差异所带来的计算挑战，他们严格的理论分析仍然难以捉摸。在这项工作中，我们基于波动电动力学框架内的模拟，对这些介电纳米带的热发射特性进行了系统的理论分析，这些模拟是在 SCUFF-EM 代码中实施的边界元法进行的。与实验一致，我们表明这些亚波长结构的发射率可以在很大程度上调整和增强超过薄膜极限。我们阐明了这些纳米带的特殊发射率是由于这种材料的声子极化激元产生的非常各向异性的热发射以及这些介电结构所维持的波导模式的特性。我们的工作说明了亚波长物体丰富的热特性，以及对能够揭示此类系统中出现的复杂热辐射现象的严格理论方法的需求。
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