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首页> 外文期刊>Journal of the Optical Society of America, B. Optical Physics >Enhancing the spectral reflectance of refractory metals by multilayer optical thin-film coatings
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Enhancing the spectral reflectance of refractory metals by multilayer optical thin-film coatings

机译：通过多层光学薄膜涂层增强耐火金属的光谱反射率

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摘要

Good thermomechanical properties of refractory metals, including tungsten, tantalum, molybdenum, and niobium, make them attractive candidates for operation in extreme environments. In addition, their ability to reflect thermal radiation in the infrared region beyond 1.5 mu m makes them attractive for use as reflective surfaces in extreme environments. These refractory metals, however, have relatively poor reflectivity in the visible and near-infrared spectral regions, making them absorb incident thermal radiation. Average absorption percentages of these metals at the 300-1500 nm spectrum is in the range of 40%-50%. In this paper, we propose and demonstrate that by using periodic thin-film dielectric coatings deposited over refractory metals, the absorption of thermal radiation can be drastically reduced. Various thin-film optical filter designs are investigated to engineer and improve the spectral reflectivity of refractory metals in the visible and near-infrared spectral regions without deteriorating the performance beyond 1.5 mu m. TiO2, Al2O3, and SiO2 are used as materials, which are dielectrics that do not absorb incident radiation in the visible and near-infrared with high melting points and Young's modulus. Our results indicate that a combination of several periodic segments, designed at different wavelengths around which high reflectivity is desired, can be utilized to generate high reflectivity in the broadband spectrum. Bandwidth and magnitude of the reflectivity over the spectrum are highly dependent on materials, number of segments, and number of layers in the segments of the filters. (C) 2018 Optical Society of America
机译：耐火金属的良好热机械性能，包括钨，钽，钼和铌，使其具有极端环境中的有吸引力的候选人。此外，它们反映超过1.5μm的红外区域的热辐射的能力使得它们具有在极端环境中的反射表面的吸引力。然而，这些耐火金属在可见和近红外光谱区域中具有相对较差的反射率，使得它们吸收入射的热辐射。 300-1500nm光谱在300-1500nm光谱下这些金属的平均吸收百分比为40％-50％。在本文中，我们提出并证明通过使用沉积在难熔金属上的周期性薄膜介电涂层，可以大大降低热辐射的吸收。研究各种薄膜光学滤波器设计，并改善可见光和近红外光谱区域中耐火金属的光谱反射率，而不会降低超过1.5μm的性能。 TiO2，Al 2 O 3和SiO2用作材料，其是不吸收可见和近红外的入射辐射的电介质，具有高熔点和杨氏模量。我们的结果表明，若干周期性段的组合，在需要不同波长的不同波长中是期望的，可以利用在宽带光谱中产生高反射率。频谱上的反射率的带宽和大小高度依赖于滤波器的段中的材料，区段数和层数。 （c）2018年光学学会

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