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Multilayer infrared reflecting optical body

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TLDR
An optical body comprising a dielectric multilayer film having a reflecting band positioned to reflect infrared radiation of at least one polarization at an incident angle normal to the film, is considered in this paper.
Abstract
An optical body comprising (a) a dielectric multilayer film having a reflecting band positioned to reflect infrared radiation of at least one polarization at an incident angle normal to the film, said reflecting band having a short wavelength bandedge μa0 and long wavelength bandedge μb0 at a normal incident angle, and a short wavelength bandedge μaυ and long wavelength bandedge μbυ at a maximum usage angle υ, wherein μaυ is less than μa0 and μa0 is selectively positioned at a wavelength greater than about 700 nm; and (b) at least one component which at least partially absorbs or reflects radiation in the wavelength region between μaυ and μa0 at a normal angle of incidence.

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References
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Patent

Multilayer polymer film with additional coatings or layers

TL;DR: A multilayer polymeric film has one or more holograms that provide attractive and useful optical effects as discussed by the authors, where the holograms can be either optical or mechanical properties differing from those of the layers in the optical stack.
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