利用可伸缩微结构VO2超表面热开关磁极化子激发增强红外辐射
Enhanced Infrared Emission by Thermally Switching the Excitation of Magnetic Polariton with Scalable Microstructured VO2 Metasurfaces
摘要：
动态辐射冷却由于其对环境变化的适应性和比静态辐射冷却更节能的承诺而引起了人们越来越多的关注。在这里，我们展示了增强的红外发射，通过热开关的激发磁极化激元与微结构的二氧化钒（VO 2）超颖表面通过可扩展的和无蚀刻的工艺制造。温度依赖的红外光谱清楚地表明，制造的可调超颖表面的光谱发射率从2到6微米的波长显着增强时，加热超过其相变温度，其中的磁极化激元与金属VO 2激发。可调谐发射光谱也被证明是不敏感的入射角和偏振角，这样的VO 2超颖表面可以被视为一个漫反射红外发射器。数值光学模拟和解析电感-电容模型阐明了绝缘或金属VO 2在相变时对磁极化激元的抑制或激发。通过热真空测试，实验证明了可调VO 2超颖表面增强热发射的效果。对于相同的加热功率为0.2 W，稳态温度的可调VO 2超颖表面发射体后，相变被发现是20摄氏度低于参考V2 O 5发射体的静态光谱发射率几乎是相同的VO 2超颖表面之前，相变。发现可调超颖表面发射器的辐射热导率在较高温度下为3.96 W/m2 K，金属VO 2为0.68 W/m2 K，在较低温度下为绝缘VO 2，清楚地表明辐射热耗散几乎增强了六倍。
英文摘要：
Dynamic radiative cooling attracts fast-increasing interest due to its adaptability to changing environment and promises for more energy-savings than the static counterpart. Here we demonstrate enhanced infrared emission by thermally switching the excitation of magnetic polariton with microstructured vanadium dioxide (VO2) metasurfaces fabricated via scalable and etch-free processes. Temperature-dependent infrared spectroscopy clearly shows that the spectral emittance of fabricated tunable metasurfaces at wavelengths from 2 to 6 um is significantly enhanced when heated beyond its phase transition temperature, where the magnetic polariton is excited with metallic VO2. The tunable emittance spectra are also demonstrated to be insensitive to incidence and polarization angles such that the VO2 metasurface can be treated as a diffuse infrared emitter. Numerical optical simulation and analytical inductance-capacitance model elucidate the suppression or excitation of magnetic polariton with insulating or metallic VO2 upon phase transition. The effect of enhanced thermal emission with the tunable VO2 metasurface is experimentally demonstrated with a thermal vacuum test. For the same heating power of 0.2 W, the steady-state temperature of the tunable VO2 metasurface emitter after phase transition is found to be 20degC lower than that of a reference V2O5 emitter whose static spectral emittance is almost the same as that of the VO2 metasurface before phase transition. The radiative thermal conductance for the tunable metasurface emitter is found to be 3.96 W/m2K with metallic VO2 at higher temperatures and 0.68 W/m2K with insulating VO2 at lower temperatures, clearly demonstrating almost six-fold enhancement in radiative heat dissipation.
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