Surface shape resonances and surface plasmon polariton excitations in bottle-shaped metallic gratings - art. no. 046608

We study surface plasmon polariton excitations and surface shape resonances in a lossy metallic grating with bivalued cavities. The modal formalism is used to solve the diffraction problem for the infinite grating and the hom ogeneous problem for a single cavity in a plane surface. Both polarization modes are considered. We provide curves of reflected efficiency versus wave length as well as near-held plots. The resonances are identified as dips in the reflected efficiency, which imply significant power absorptions. Resul ts far various depths of the cavities and far several angles of incidence a re shown, where the different types of resonant behavior can be appreciated . Particular attention is paid to the changes introduced by the finite cond uctivity of the metal in relation to the results obtained for a perfect con ductor.