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Journal of the Optical Society of America B

Hysteresis behavior in light reflection from a dense resonant medium with intrinsic optical bistability

Anatoly A. Afanas'ev, R. A. Vlasov, N. B. Gubar, Vasily M. Volkov

Published Mar 1, 1998• 21 citations
Publisher

Abstract

We consider a boundary value problem of reflection of a powerful light wave from a dense resonant medium that exhibits intrinsic optical bistability because of the dipole–dipole interaction of two-level atoms. On the basis of analytical solutions and numerical simulations we establish that intrinsic optical bistability results in the dependence of the reflection coefficient on the adiabatically varying intensity of an external field. The reflection coefficient is an oscillating function of the intensity because of the additional reflectivity that is due to a light-induced sharp discontinuity in the nonlinear permittivity of a dense resonant medium.

DOI
10.1364/josab.15.001160

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We consider a boundary value problem of reflection of a powerful light wave from a dense resonant medium that exhibits intrinsic optical bistability because of the dipole–dipole interaction of two-level atoms. On the basis of analytical solutions and numerical simulations we establish that intrinsic optical bistability results in the dependence of the reflection coefficient on the adiabatically varying intensity of an external field. The reflection coefficient is an oscillating function of the intensity because of the additional reflectivity that is due to a light-induced sharp discontinuity in the nonlinear permittivity of a dense resonant medium.
A system of coherently driven spatially distributed two-level atoms, coupled with each other via dipole–dipole interaction, exhibits intrinsic optical bistability (IOB) at solid-state densities,1 i.e., optical bistability without optical feedback. The origin of the IOB was shown to be due to inversion-dependent renormalization of the single-atom resonance frequency caused by dipole–dipole interaction among the atoms located mainly within an atomic resonance wavelength.2 For normally incident plane waves of intensity beyond threshold, a spatially dependent discontinuity in the nonlinear refractive index was shown to exist inside the medium,1 corresponding to spatial separation of the high and low absorption phases of the IOB. We present numerical results for the time-dependent solutions of the equations of motion and dynamics of the field propagation.
A rigorous solution is given in the plane-wave approximation for the boundary problem of light reflection from the interface between an isotropic medium and a photorefractive crystal with drift-diffusion nonlinearity. The possibility of realizing hysteresis reflection or optical bistability in the system under certain conditions is shown. Analytical expressions are obtained that describe the hysteresis behavior of reflectivity as a function of the angle of incidence or the strength of a constant external electric field applied to the crystal. The results of the study are of interest for the development of devices controlling laser radiation.
The rigorous solution in the plane-wave approximation of the light reflection boundary problem for the interface the isotropic medium - photorefractive crystal with the drift- diffusion nonlinearity mechanism is given. The possibility of the realization of the hysteresis light reflection phenomenon in this case under certain conditions is shown. The analytical expressions describing hysteresis behavior of the reflectivity as a function of the angle of incidence or that of the external electric field strength applied to the crystal are derived. By changing the value and sign of the applied electric field it is possible to transfer system from the total reflection state to the transmission state and vice versa. The obtained results are attractive for the elaboration of the possible devices for laser radiation control and optical information processing.
We investigate the effect of a linear host medium on the dynamics of a dense collection of resonant atoms. We find that near dipole-dipole interaction is enhanced by the presence of the host dielectric, resulting in a lower threshold density and a greater hysteresis area for intrinsic optical bistability. Cooperative decay terms appear that represent the interaction of near dipoles mediated by the absorptive component of the dielectric function of the host medium. These terms are part of the local response and correspond to local cooperative decay effects. \textcopyright{} 1996 The American Physical Society.
We consider the optical response of a one-dimensional photonic crystal with a dense resonant medium as a defect. Using the iteration matrix approach, we calculate the intensity distribution in this structure and the reflection and transmission properties of it. We discuss the influence of photonic crystal on the bistable behavior of a dense resonant medium both within and outside the region of intrinsic optical bistability. Finally we compare our results with the case without taking into account near dipole-dipole interaction.
We study the nonlinear resonant reflection of an intense linearly polarized plane wave from a vacuum-dense two-level-medium interface under normal-incidence conditions. A domain of parameters is specially selected for which one needs to take into account strong atom–field coupling, which results in the appearance of a gap in the spectrum of mixed states (polaritons). For the linear problem, the presence of the gap causes a strong reflection of an incident signal with a frequency within the gap. The near-zone dipole–dipole interaction is also included within the framework of the local-field approach. By performing the time-domain analysis of the reflectivity at different spectral points, we observe certain peculiarities, such as the possibility of a steady-state high-contrast optical switching with low-level operation, stable and unstable hysteresis loops, and an auto-oscillation regime of reflectivity for a certain range of the parameters driving the evolution of the system.