Resonance reflection of light by a periodic system of excitons in GaAs/AlGaAs quantum wells

Abstract

The optical reflection spectra of periodic structures with two quantum wells in the unit cell are investigated. The dependences of the features of Bragg reflection and exciton-polariton reflection on the angle of incidence and polarization of light and the sample temperature are studied. Analysis of the experimental data shows that a 60-period structure acts as a distributed Bragg reflector with a peak reflectivity exceeding 90% and a spectral band width as large as 16 meV.