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看似普通的一层薄膜，在红外热成像相机镜头下能够随着观察角度的改变或偏振片的旋转，时而显现出隐藏的图案，时而完全消失。甚至，同一个器件在不同观测条件下，可以组合出8种独立的“开关”状态，像一把物理钥匙，守护着加密信息的安全。这不是科幻电影的情节，而是基于近零介电常数材料的热辐射调控技术正在实现的事情。
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超构薄膜红外偏振防伪器件 （图片来源：《ACS Applied Optical Materials》）
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用于红外加密-解密应用的角向和偏振选择性红外窄带热发射器的示意。热发射器样品发射双波长窄带红外光，然后通过7.5~8.5 μm的高透射率滤光片进行滤波，并通过偏振器进行偏振 （图片来源：《Science》）
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