Share Email Print
cover

Proceedings Paper

Optical modeling of nanostructured films for selective coatings
Author(s): Pietro P. Altermatt; Yang Yang; Jun Wang; Rolf Reineke-Koch; Federico Giovannetti
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

To improve the efficiency of solar thermal collectors, selective coatings need to be maximally transparent to sunlight (up to 2500 nm wavelength) and maximally reflective to heat radiation. One way to improve the transparency for sunlight without compromising the reflective properties at longer wavelengths is structuring thin metal films with holes. The purpose of this paper is to develop computer model capabilities to predict the optical properties of such structures by solving the Maxwell and materials equations using the finite element method in three dimensions. Coupling both sets of equations enables us to incorporate the full dispersion of metals, including their negative real part of permittivity. The finite element model is validated in two ways: firstly, by simulations of structured films using the FDTD method in the range of positive permittivity; and secondly, by the transmission and the ellipsometric measurement of homogeneous films. The simulations predict that holes with a diameter between 300 and 500 nm - and aligned in arrays with a mutual distance between 500 and 800 nm - significantly improve the performance of selective layers used for solar thermal collectors.

Paper Details

Date Published: 11 September 2008
PDF: 9 pages
Proc. SPIE 7046, Optical Modeling and Measurements for Solar Energy Systems II, 704607 (11 September 2008); doi: 10.1117/12.794509
Show Author Affiliations
Pietro P. Altermatt, Univ. Hannover (Germany)
Institute for Solar Energy Research Hamelin (Germany)
Yang Yang, Institute for Solar Energy Research Hamelin (Germany)
Sun Yat-Sen Univ. (China)
Jun Wang, Institute for Solar Energy Research Hamelin (Germany)
Rolf Reineke-Koch, Institute for Solar Energy Research Hamelin (Germany)
Federico Giovannetti, Institute for Solar Energy Research Hamelin (Germany)


Published in SPIE Proceedings Vol. 7046:
Optical Modeling and Measurements for Solar Energy Systems II
Benjamin K. Tsai, Editor(s)

© SPIE. Terms of Use
Back to Top