Theory of nonlinear directional couplers

A method is proposed for obtaining exact analytical solutions for the system of nonlinear equations for the propagation of electromagnetic waves in directional couplers with an arbitrary nonlinearity in the propagation constant. The resulting solutions can be used to determine the operating characteristics of nonlinear directional couplers. Zh. Tekh. Fiz. 69, 69–71 (August 1999)     

Nonlinear TE-polarized quasi-surface waves in a symmetric optical waveguide with a nonlinear core

A theory of nonlinear polarized symmetric quasi-surface waves in a symmetric planar structure with a nonlinear core and linear coatings has been proposed. The nonlinearity of the core is caused by exciton-photon interaction and optical exciton-biexciton conversion. The dispersion laws for propagating waves have been obtained and studied.     

Light Reflection from the end of a semi-infinite semiconductor under conditions of two-photon excitation of biexcitons

It is shown that reflectivity of the end of a semi-infinite semiconductor under conditions of twopulse two-photon excitation of biexcitons from the ground state of the crystal is characterized by a multistable behavior as a function of amplitudes of the incident pulse fields.     

Features of the optical bistability in an exciton-biexciton system

The role of exciton-exciton, exciton-biexciton, and biexciton-biexciton interactions in the nonlinear transmission function of a ring cavity is studied. It is shown that transmission functions both without hysteresis and with one or two hysteresis loops can be obtained by taking into account the elastic interparticle interactions in the exciton-biexciton system. Fiz. Tverd. Tela (St. Petersburg) 40, 927–928 (May 1998)     

Interaction of light with a semiconductor thin film, taking into account concentration gain of the dipole moment of the excitonic transition

The peculiarities of nonlinear transmission of ultrashort pulses of resonance laser radiation by a semiconductor thin film in the excitonic spectral region have been studied, taking into account the exciton-phonon interaction and concentration gain of the dipole moment of the excitonic transition. It has been shown that under exact resonance conditions the film transmits only the leading edge of the incident rectangular pulse and completely reflects the remaining part. For a nonzero off-resonance, a residual transmission occurs. A series of possibilities for transforming Gaussian pulses is predicted. The state equations for steady-state bistable transmission (reflection) have been derived, and the stability of the solutions has been studied. A theorem of areas, which predicts area restriction of the transmitted pulses, has been stated; namely, the transmitted pulse area cannot exceed π/2.     

Dynamics of a parametric exciton-polariton oscillator in a microcavity

We study the dynamics of parametric oscillations of polaritons in a microcavity that consists of a periodic conversion of a pair of pump polaritons into polaritons of signal and idle modes and vice versa. The period and amplitude of oscillations considerably depend on the initial polariton density, the initial phase difference, and the resonance detuning. We show that there is a possibility of phase controlling the polariton dynamics in the microcavity.