Abstract Thin AlN and MgO poly- or nano-structured layers were synthesized on bendable polymeric substrates using the helicon-arc ion-plasma method. They can be used as filters to block infrared (IR) radiation from civil and military objects. To suppress IR radiation within the range λ ~ 7.5…25 µm, where most of the radiation power from objects with the temperature T ~ 300…400 K is concentrated, we have used AlN and MgO thin layers (d ~ 1.5…10 μm) that have the Restrahlen bands within the spectral range indicated above. The optical, structural properties and chemical composition of AlN and MgO films on the Mylar or Teflon substrates have been investigated. These filters demonstrate blocking characteristics for masking the thermal image of objects heated to a temperature of 300…400 K in the IR spectral range. At the same time, they are well transparent in the microwave and THz spectral ranges (transparency τ up to ≈ 80…85%). Moreover, thin Mylar films with AlN coatings are transparent in the visible range. Using the combined coatings of AlN with high thermal conductivity (110…140 W/m·K in the polycrystalline form) for heat withdraw to the periphery or air and MgO coatings, one can suppress IR radiation by more than 90% within the spectral range λ = 7.5…25 μm.

中文翻译：

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可弯曲聚合物基板上的 AlN 和 MgO 薄层涂层作为红外和太赫兹光谱范围的选择性过滤器

摘要 使用螺旋弧离子等离子体方法在可弯曲的聚合物基材上合成了薄的 AlN 和 MgO 多聚或纳米结构层。它们可以用作过滤器来阻挡来自民用和军用物体的红外 (IR) 辐射。为了抑制 λ ~ 7.5…25 µm 范围内的 IR 辐射，其中大部分来自温度 T ~ 300…400 K 物体的辐射功率集中，我们使用了 AlN 和 MgO 薄层（d ~ 1.5…10 µm）具有上述光谱范围内的 Restrahlen 带。已经研究了 Mylar 或 Teflon 基板上的 AlN 和 MgO 薄膜的光学、结构特性和化学成分。这些滤光片展示了屏蔽特性，可以屏蔽在红外光谱范围内加热到 300…400 K 温度的物体的热图像。同时，它们在微波和太赫兹光谱范围内非常透明（透明度 τ 高达 ≈ 80…85%）。此外，带有 AlN 涂层的 Mylar 薄膜在可见光范围内是透明的。使用具有高导热性的 AlN 涂层（多晶形式为 110…140 W/m·K）用于向外围散热或空气和 MgO 涂层的组合涂层，可以在光谱范围内抑制 90% 以上的红外辐射λ = 7.5…25 μm。