Intercoupling of free-space radiation to s-polarized confined modes via nanocavities

Nikitin, A. Yu.; García-Vidal, F. J.; Martín-Moreno, L.
February 2009
Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG
Academic Journal
The interaction of the s-polarized waveguide mode in the dielectric layer placed on a metal film with one-dimensional indentations in the metal is studied. The efficiency of the coupling to the out-of-plane radiation is considered. It is shown that varying the parameters of the cavities, the periodical array of resonant indentations can almost totally reflect back the incident waveguide mode or, on the contrary, efficiently transform it into a narrow-directional outgoing beam. An efficient waveguide mode launcher is examined on the basis of the results for Bragg mirror. The differences and similarities between scattering of surface plasmon polaritons and waveguide modes are discussed.


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