RESONANT BRAGG REFLECTION FROM QUANTUM-WELL STRUCTURES

The resonant spectra of light reflected and transmitted by a heterostr ucture with a finite system of equidistant quantum wells have been cal culated. Recurrence relations have been derived connecting the amplitu de reflection coefficients from N and N - 2 quantum wells, and analyti cal properties of the reflection coefficient as a function of the comp lex frequency omega have been established. A method has been proposed which allows one to find complex frequencies of coupled exciton-photon nonstationary modes, or exciton-polaritons. It has been shown that th e resonant Bragg structures represent a particular case where among N eigenmodes only one is radiative.