Electromagnetic resonances of sub-wavelength rectangular metallic gratings A. Barbara, P. Quémerais, E. Bustarret, T. López-Rios and T. Fournier Eur. Phys. J. D, 23 1 (2003) 143-154 Published online: 04 February 2003 DOI: 10.1140/epjd/e2003-00025-9