Resonant enhancement of electromagnetic wave in the structure with refractive index gradient

Propagation of electromagnetic wave (EW) through graded refractive index material is studied theoretically. Green's function technique used to obtain the solution of Maxwell equation in the gradient region for the nonzero angle of incidence wave. Results of our calculations show a resonant increase in the amplitude of EW waves for a certain frequency. We studied effects of the size and profile of gradation region on the position (frequencies) of the resonances.