Excitonic Optical Nonlinearity in II‐VI MOCVD‐Grown Crystals

Abstract

a), S. V. GAPONENKO (a), I. E. MALINOVSKII (a), V. Yu. LEBED (a), P. I. KUZNETSOV (b), G. G. YAKUSHCHEVA (b), and A. V. KUZNETSOV (c)Using the method of single-and two-beam laser spectroscopy, the nonlinear optical properties of high-quality MOCVD-grown ZnSe and CdSe samples are studied. At nitrogen temperatures the dominating mechanism of absorption nonlinearity is the plasma screening of excitons. Along with this, in the nonlinear response of ZnSe crystals the exciton-exciton interaction causing band broadening takes place. At room temperatures, in CdSe a strong dependence is revealed of absorption spectrum deformation on the exciting radiation quanta energy which is associated with slowing down of electron-hole plasma cooling.

Optical properties of multilayer heterostructures based on zinc chalcogenides upon strong laser excitation

“…This is a major component for designing semiconductor lasers and light-emitting diodes emitting in the blue region of the spectrum. It also has strong nonlinear optical properties; in particular, coherent phenomena of different orders, exciton and polariton nonlinearity [5,6], and optical bistability [7] are observed in it.…”

“…This is a major component for designing semiconductor lasers and light-emitting diodes emitting in the blue region of the spectrum. It also has strong nonlinear optical properties; in particular, coherent phenomena of different orders, exciton and polariton nonlinearity [5,6], and optical bistability [7] are observed in it.With strong laser excitation, a dense nonequilibrium electron-hole (e-h) plasma is formed in semiconductor materials. The major contribution to plasma relaxation processes comes from scattering off charge carriers and polar optical phonons and also intervalley scattering, characterized by fast temporal response.…”