NONLINEAR ANALYSIS OF DISPERSION FROM DOUBLE PERIODIC SEMICONDUCTOR GRATING

We have derived the dispersion relation for double GaAs semiconductor grating, using nonlinear boundary condition approach. The grating medium is assumed to non-magnetic and it has sinusoidal undulation of angular frequency ω on both side of the film. In the limit when plasma wavevector kp is greater than k‖ wavevector of the wave, we obtained two branches in the dispersion curve which corresponds to electrostatic charge disposition on the two sides of grating. In the limiting case kp < k‖, the grating radiate the electromagnetic field in the vicinity area.