Metasurface Optical Solar Reflectors Using AZO Transparent Conducting Oxides for Radiative Cooling of Spacecraft
Metasurface Optical Solar Reflectors Using AZO Transparent Conducting Oxides for Radiative Cooling of Spacecraft
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DOI：
10.1021/acsphotonics.7b00991
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发表时间：
2017-12
期刊：
影响因子：
7
通讯作者：
K. Sun;C. Riedel;Yudong Wang;A. Urbani;M. Simeoni;S. Mengali;M. Zalkovskij;B. Bilenberg;C. Groot;O. Muskens
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文献类型：
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作者：
K. Sun;C. Riedel;Yudong Wang;A. Urbani;M. Simeoni;S. Mengali;M. Zalkovskij;B. Bilenberg;C. Groot;O. Muskens
光学太阳能反射器是将对可见光波长的高反射与红外线中的强发射率相结合的联合收割机。与20世纪60年代以来航天器上使用的传统刚性石英瓦相比，薄膜解决方案在重量、组装和发射成本方面具有显着优势。在这里，我们提出了一种基于超颖表面的方法，使用Al掺杂的ZnO（AZO）透明导电氧化物作为红外等离子体材料。AZO被图案化成超颖表面，以实现宽等离子体共振，并增强热红外中的电磁辐射的吸收。在可见光范围内，透明导电氧化物提供低的太阳辐射损失，而在紫外线范围内的固有吸收损失使用多层反射涂层被有效地抑制。向堆栈添加高发射率层最终导致与薄等离子体装置相当的发射率值，从而为等离子体吸收定义了机会窗口。
Optical solar reflectors are devices that combine high reflection for visible wavelengths with a strong emissivity in the infrared. Compared to the conventional rigid quartz tiles used on spacecraft since the 1960s, thin-film solutions can offer a significant advantage in weight, assembly, and launch costs. Here, we present a metasurface-based approach using an Al-doped ZnO (AZO) transparent conducting oxide as infrared plasmonic material. The AZO is patterned into a metasurface to achieve broad plasmonic resonances with an enhanced absorption of electromagnetic radiation in the thermal infrared. In the visible range, the transparent conducting oxide provides low losses for solar radiation, while intrinsic absorption losses in the ultraviolet range are effectively suppressed using a multilayer reflecting coating. The addition of high-emissivity layers to the stack eventually results in comparable emissivity values to the thin plasmonic device, thus defining a window of opportunity for plasmonic absorption...