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Role of surface profiles in surface plasmon-polariton-mediated emission of light through a thin metal film

We show that the emission of light mediated by surface plasmon-polaritons through a thin metal film depends sensitively on the profile of the grating structure used to couple the surface plasmon-polariton modes to light. In particular, we show that when the emission of light takes place through a metal film, a non-conformal geometry for the two surfaces of the metal film is to be preferred. Our results may be important in the design of devices such as organic light-emitting diodes.