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7 May 2009Demonstration of flexible nanocomposite NIR mirror
Thin film metal oxide coatings have been used for commercial electromagnetic filters from the UV to infra red regions
for over half a century. Deposition onto a substrate has typically been accomplished using vapor deposition techniques
and more recently sol-gel methods. These coatings provide very good optical performance under abrasion, thermal
cycles and variable humidity when applied on substrates with similar thermal and mechanical properties. When
conventional metal oxide coatings are applied to flexible, relatively soft substrates such as polymers, mismatches in
mechanical properties can reduce interfacial adhesion or accelerate mechanical failures. The authors recently showed
that a thin film polymer nanocomposite can be applied on a polymer substrate and maintain adhesion even under high
strains. This paper describes the demonstration of an IR mirror using fifteen discrete layers with an IR-reflectance that
exceeds 90 percent at 1064 nm and transparent in the visible spectrum. We will present the results with thin film stacks
containing over 15 discrete layers for IR mirror applications, and our recent work shows that the technology can produce
thin film stacks containing 30 layers or more. Furthermore these coatings have high flexibility and can be applied to
curved polymer substrates. These IR mirrors can withstand thermal cycling and large strains much better than those
made using the state of the art techniques.
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Thad Druffel, Eric Grulke, "Demonstration of flexible nanocomposite NIR mirror," Proc. SPIE 7298, Infrared Technology and Applications XXXV, 729812 (7 May 2009); https://doi.org/10.1117/12.820234