Extraordinary transmission of intense short laser pulse through thin foil with near- and sub-wavelength slits

To supplement our earlier study [Lu et al., AIP Adv. 10, 015209 (2020)] on the propagation of intense short laser pulse through foils with multiple sub-wavelength sized slits, here, we consider the effects of the interaction parameters on the occurrence of extremums in the light transmission. Our results suggest that for periodic slit distribution, maximum and minimum transmissions occur for L +/- d = kappa lambda and L = kappa lambda, respectively, where L and d are the period and width of the slits, respectively, lambda is the laser wavelength, and kappa is a positive integer or a rational number.