Dynamic control of polarized thermal emission from VO2 nanofins

IF 1.5 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Caleb Estherby, M. Arnold, M. Tai, A. Gentle
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引用次数: 0

Abstract

Abstract. We demonstrate switchable polarized thermal emission from VO2 nanofin stacks fabricated by co-deposition, etching, and oxidation. We find that reverse switching of the thermal emission is enabled by a reflecting underlayer and induced by either short oxidation time or additional deposition of a reflecting underlayer. Observed thermal emission is well explained by a biaxial Bruggeman effective medium model, which predicts the strong polarization change for aligned fin layers in the micron thickness range. The dominant polarization of the emission is modulated by the presence of a reflector, oxidation of the fins, fin fill-factor, and structural anisotropy. Normal incidence polarized emittance change of up to 0.6 is theoretically possible, and we were able to demonstrate a change of 0.34, similar to that predicted by the model.
VO2纳米纤维极化热发射的动态控制
摘要我们展示了通过共沉积、蚀刻和氧化制造的VO2纳米纤维堆叠的可切换极化热发射。我们发现,热发射的反向切换是由反射底层实现的,并且是由短氧化时间或反射底层的额外沉积引起的。双轴Bruggeman有效介质模型很好地解释了观测到的热发射,该模型预测了在微米厚度范围内排列的翅片层的强极化变化。发射的主要偏振由反射器的存在、翅片的氧化、翅片填充因子和结构各向异性调制。理论上,高达0.6的正入射极化发射度变化是可能的,我们能够证明0.34的变化,类似于模型预测的变化。
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来源期刊
Journal of Photonics for Energy
Journal of Photonics for Energy MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
3.20
自引率
5.90%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Journal of Photonics for Energy publishes peer-reviewed papers covering fundamental and applied research areas focused on the applications of photonics for renewable energy harvesting, conversion, storage, distribution, monitoring, consumption, and efficient usage.
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