Abstract
We derive analytical expressions for the spontaneous emission rate as well as for the radiation pattern of a dipole source near a metallic grating with subwavelength slits. The theory is based on an extension of a surface impedance model used to explain the enhanced transmission in such systems [J. A. Porto et al., Phys. Rev. Lett. 83, 2845 (1999)]. Our results show how the coupling to the photonic resonances of the grating, which are responsible for its enhanced transmission, can be exploited to control effectively the dipole emission dynamics as well as its radiative efficiency and directivity.
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