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Hollow aluminum microspheres with high mass extinction coefficients in the long wave infrared
Journal of the Optical Society of America A ( IF 1.9 ) Pub Date : 2020-11-23 , DOI: 10.1364/josaa.402023
Benjamin S. Garrett , Nicholas J. Hudak , Mathew Zablocki , Timothy Creazzo , Ahmed Sharkawy , Brendan G. DeLacy , Mark S. Mirotznik

Previous electromagnetic computations of multilayered dielectric/metallic spheres identified the ideal dimensions and composition for achieving optimized mass extinction coefficients (${{\rm{m}}^2}\!/{\rm{g}}$). A hollow metallic sphere, with a thin metallic shell, is one such example of a spherical structure that can theoretically achieve high mass extinction coefficients in the long wave infrared (LWIR) region (8–12 µm). To this end, we endeavored to demonstrate a cost-effective and scalable manufacturing approach for synthesizing and experimentally validating the mass extinction coefficients of hollow metallic spheres. Specifically, we detail a novel approach for fabricating hollow aluminum spheres using radio frequency (RF) magnetron sputter deposition. Sacrificial high-density polyethylene polymer microspheres were used as substrates for the deposition of thin layers of aluminum. The core shell structures were subsequently thermally processed to form the hollow micron sized aluminum shells. The mass extinction coefficients of the hollow aluminum spheres were subsequently measured and compared to computational results. A strong agreement between experimental and theoretical predictions was observed. Finally, the LWIR mass extinction coefficients of the hollow spheres were compared to high aspect ratio brass flakes, a common pigment used for LWIR attenuation, and other materials and geometries that are used for LWIR filtering applications. This comparison of both performance and availability revealed that the fabricated hollow aluminum spheres exhibited competitive LWIR properties using a more scalable and cost-effective manufacturing approach.

中文翻译:

在长波红外中具有高质量消光系数的中空铝微球

先前对多层电介质/金属球的电磁计算确定了实现最佳质量消光系数($ {{\ rm {m}} ^ 2} \!/ {\ rm {g}} $的理想尺寸和组成)。具有金属外壳的空心金属球就是这样一种球形结构的例子,从理论上讲,它可以在长波红外(LWIR)区域(8-12 µm)内实现较高的质量消光系数。为此,我们努力展示一种经济高效且可扩展的制造方法,用于合成和实验验证空心金属球的质量消光系数。具体来说,我们详细介绍了一种使用射频(RF)磁控溅射沉积技术制造空心铝球的新颖方法。牺牲性高密度聚乙烯聚合物微球被用作沉积铝薄层的基质。随后将核壳结构热处理以形成中空微米尺寸的铝壳。随后测量了空心铝球的质量消光系数,并将其与计算结果进行了比较。观察到实验和理论预测之间的强烈共识。最后,将空心球的LWIR质量消光系数与高长宽比的黄铜片,用于LWIR衰减的常见颜料以及用于LWIR过滤应用的其他材料和几何形状进行了比较。性能和可用性的比较表明,使用更可扩展且更具成本效益的制造方法,制造的空心铝球展现出具有竞争力的LWIR特性。将空心球的LWIR质量消光系数与高长宽比的黄铜片,用于LWIR衰减的常见颜料以及用于LWIR过滤应用的其他材料和几何形状进行了比较。性能和可用性的比较表明,使用更可扩展且更具成本效益的制造方法,制造的空心铝球展现出具有竞争力的LWIR特性。将空心球的LWIR质量消光系数与高长宽比的黄铜片,用于LWIR衰减的常见颜料以及用于LWIR过滤应用的其他材料和几何形状进行了比较。性能和可用性的比较表明,使用更可扩展且更具成本效益的制造方法,制造的空心铝球展现出具有竞争力的LWIR特性。
更新日期:2020-12-02
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