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(Color online) Light emission via coupling of SPP to radiation modes by a grating placed at the interface. The dot indicates an emitting center within the GaN layer.
SPP dispersion curve and Purcell factor .
SPP–radiation coupling by 1D and 2D basic grating vectors G in reciprocal space.
(a) SPP enhancement factor by 1D and 2D gratings with . (b) The optimal SPP enhancement by 1D grating as a function of the original radiative efficiency of the emitter at optimal value .
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