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.

中文翻译：

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VO2纳米鳍极化热发射的动态控制

我们展示了通过共沉积、蚀刻和氧化制造的 VO2 纳米鳍堆叠的可切换极化热发射。我们发现热发射的反向转换是通过反射底层实现的，并由短氧化时间或反射底层的额外沉积引起。双轴布鲁格曼有效介质模型很好地解释了观察到的热辐射，该模型预测了微米厚度范围内对齐翅片层的强极化变化。发射的主要极化由反射器的存在、翅片的氧化、翅片填充因子和结构各向异性调制。理论上，法向入射偏振发射率变化高达 0.6 是可能的，我们能够证明变化为 0.34，与模型预测的相似。