| Abstract: | We study the single scattering of a plane electromagnetic wave by random inhomogeneities in a plane periodically nonuniform
layer with a reflecting rear boundary. It is shown that when the incident wave satisfies the condition of excitation of the
fundamental Bragg cavity mode and its field is large in the layer depth, the average angular spectrum of the backscattered
wave field at the cavity output has a narrow maximum proportional to the exponent of the quadruple optical thickness of the
periodic structure. This maximum corresponds to the condition of excitation of the fundamental Bragg cavity mode by the scattered
field. The other spectral maxima have small amplitudes and intensities. Such scattering takes place if the characteristic
size of random inhomogeneities in the direction perpendicular to the layer boundary exceeds the scale of multiple scattering
on a periodic structure.
Radiophysical Research Institute, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika,
Vol. 40, No. 11, pp. 1342–1354, November, 1997. |
