Effective spectral optical functions of lamellar nanogratingsMartin Foldyna, Kamil Postava, Razvigor Ossikovski, Antonello De Martino and Enric Garcia-CaurelJ. Eur. Opt. Soc.-Rapid Publ., 1 (2006) 06015DOI: https://doi.org/10.2971/jeos.2006.06015