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Proceedings Paper

Metal-dielectric frequency-selective surface for high performance solar window coatings
Author(s): Fatima Toor; Ananda Carl Guneratne; Marina Temchenko
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Paper Abstract

We demonstrate a solar control window film consisting of metallic nanoantennas designed to reflect infrared (IR) light while allowing visible light to pass through. The film consists of a capacitive frequency-selective surface (CFSS) which acts as a band-stop filter, reflecting only light at target wavelengths. The designed CFSS when installed on windows will lower air conditioning costs by reflecting undesired wavelengths of light and thus reduce the amount of heat that enters a building. State-of-the-art commercial solar control films consist of a multilayer stack which is costly (~$13/m2 to $40/m2) to manufacture and absorbs IR radiation, causing delamination or glass breakage when attached to windows. Our solar control film consists of a nanostructured metallic layer on a polyethylene terephthalate (PET) substrate that reflects IR radiation instead of absorbing it, solving the delamination problem. The CFSS is also easy to manufacture with roll-to-roll nanoimprint lithography at a cost of <$12/m2. We design the CFSS using the COMSOL Wave Optics module to solve for electromagnetic wave propagation in optical media via the finite element method. The simulation domain is reduced to a single unit cell with periodic boundary conditions to account for the symmetries of the planar, periodic CFSS. The design is optimized using parametric sweeps around the various geometric components of the metallic nanoantenna. Our design achieves peak reflection of 80% at 1000 nm and has a broadband IR response that will allow for optimum solar control without significantly affecting the transmission of visible light.

Paper Details

Date Published: 14 March 2016
PDF: 6 pages
Proc. SPIE 9756, Photonic and Phononic Properties of Engineered Nanostructures VI, 97561S (14 March 2016); doi: 10.1117/12.2211179
Show Author Affiliations
Fatima Toor, The Univ. of Iowa (United States)
Ananda Carl Guneratne, The Univ. of Iowa (United States)
Marina Temchenko, Madico, Inc. (United States)

Published in SPIE Proceedings Vol. 9756:
Photonic and Phononic Properties of Engineered Nanostructures VI
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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