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Proceedings Paper

Improved performance of thin film broadband antireflective coatings
Author(s): Matthew Mishrikey; Arya Fallahi; Christian Hafner; Rüdiger Vahldieck
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Paper Abstract

Antireflective coatings are useful for a range of applications, from minimizing the radar cross-section of stealth aircraft, to maximizing the efficiency of solar energy panels. New low-index nanorod thin films promise broadband, broad angle performance for such coatings. We demonstrate that a bandwidth increase from 38.5% to 113% is possible by using a simple evolutionary strategy to optimize the thin film material parameters. A two dimensional FDTD planewave periodic scattering approach is used to demonstrate additional performance increase by adding losses to a single layer. The same technique may be used for antireflective coatings for which no analytical solution exists, as is the case with dispersive, non-linear materials, special geometries, and coatings with metallic or ferromagnetic inclusions. A procedure is outlined for using the FDTD approach to obtain a map of reflection coefficients with respect to wavelength and incidence angle.

Paper Details

Date Published: 10 October 2007
PDF: 9 pages
Proc. SPIE 6717, Optomechatronic Micro/Nano Devices and Components III, 671702 (10 October 2007); doi: 10.1117/12.754320
Show Author Affiliations
Matthew Mishrikey, ETH Zurich (Switzerland)
Arya Fallahi, ETH Zurich (Switzerland)
Christian Hafner, ETH Zurich (Switzerland)
Rüdiger Vahldieck, ETH Zurich (Switzerland)

Published in SPIE Proceedings Vol. 6717:
Optomechatronic Micro/Nano Devices and Components III
Lixin Dong; Yoshitada Katagiri; Eiji Higurashi; Hiroshi Toshiyoshi; Yves-Alain Peter, Editor(s)

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