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I am looking to make a NIR (Near Infrared) window for a project I am working on but need it to appear white rather than the typical Reddish Black NIR window found on most remotes. Does a dye or pigment exist that makes PMMA or PC (open to other injection moldable thermoplastics!) look white but allows NIR (specifically 940nm) to pass with low loss?

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  • $\begingroup$ What about the plastics used to encapsulate LED NIR emitters? These are usually, I think, epoxy resins. In fact, these days many IR-based remote controls will use a naked LED with no other window so do you really need an extra window? $\endgroup$ – matt_black Sep 26 '16 at 16:15
  • $\begingroup$ interesting. Most I have seen are either a blackish appearance or clear. I will look around for white and report back my findings. $\endgroup$ – dandroid88 Sep 28 '16 at 14:45

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