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[求助] 如何理解一种材料对可见光不透明而对红外光透明？已有1人参与

最近看到崔大牛的纳米多孔PE膜应用于降温织物的文章。读到文中说：We show that nanoporous polyethylene is transparent to mid-infrared human body radiation but opaque to visible light because of the pore size distribution (50 to 1000 nanometers). 后来文章中也有解释：The pore sizes are in the size range comparable with the wavelength of visible light (400 to 700 nm), which scatter visible light strongly and make PE opaque to human eyes. The pore sizes are also much smaller than the IR wavelength, so the nanoPE film is still highly transparent to IR. 这段话翻译的意思大概是说：可见光的波长在PE多孔膜的孔径范围内，所以基本上可见光均被散射；然后中红外的波长远大于PE膜孔径，所以其对中红外光是透明的。貌似我学得物理知识全忘记了。怎么都不能理解这段话的原理。