Surface Plasmon Dispersion Relation and Local Field Enhancement Distribution for a Deep Sinusoidal Grating.
Interim technical rept.,
STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
Pagination or Media Count:
Two features of light scattering from a deep lossless metallic sinusoidal grating are considered in the limit gd approaches infinity, where g and d are the height and periodicity of the grating, respectively. It is found that the surface plasmon dispersion relation is comprised of two flat bands with a frequency gap Delta omegaomega sub p sq rt. 2 - 12, where omega sub p is the volume plasmon frequency. For the local field enhancement distribution at the gratings surface, the results show the existence of two qualitatively distinct domains, i.e., lamda d and lambda d, where lambda denotes the radiation wavelength. In both domains, however, the local field enhancement is larger at the bottom of the troughs than at the top of the peaks. The dressed Rayleigh expansion is used throughout for the analysis.