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Optical Memory and Neural Networks

About the problems of optical fields and medium nanodiagnostics

Ірина Василівна Солтис, Pavlo A. Riabyi

Published Jul 1, 2014• 0 citations
Publisher

Abstract

The media of layered crystals as a possible element of memory in the storage systems were analyzed, the manipulation mechanisms of which are carried out with polarization of incident radiation. The phenomenon of polarization optical bistability in the medium of layered crystals was obtained, in which the transmission band is managed with only the change of polarization of incident radiation. On the basis of the mechanism of polarization control of nanoparticles motion in the tasks of polarization diagnostics of optical fields, the estimation of the coherent features of mutually orthogonal linearly polarized optical fields was performed that also enables to analyze the terms of storage of information about the structure of an optical field.

DOI
10.3103/s1060992x14030114

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The media of layered crystals as a possible element of memory in the storage systems were analyzed, the manipulation mechanisms of which are carried out with polarization of incident radiation. The phenomenon of polarization optical bistability in the medium of layered crystals was obtained, in which the transmission band is managed with only the change of polarization of incident radiation. On the basis of the mechanism of polarization control of nanoparticles motion in the tasks of polarization diagnostics of optical fields, the estimation of the coherent features of mutually orthogonal linearly polarized optical fields was performed that also enables to analyze the terms of storage of information about the structure of an optical field.
The media of layered crystals as a possible element of memory in the storage systems were analyzed, the manipulation mechanisms of which are carried out with polarization of incident radiation. The phenomenon of polarization optical bistability in the medium of layered crystals was obtained, in which the transmission band is managed with only the change of polarization of incident radiation. On the basis of the mechanism of polarization control of nanoparticles motion in the tasks of polarization diagnostics of optical fields, the estimation of the coherent features of mutually orthogonal linearly polarized optical fields was performed that also enables to analyze the terms of storage of information about the structure of an optical field.
The media of layered crystals as a possible element of memory in the storage systems were analyzed, the manipulation mechanisms of which are carried out with polarization of incident radiation. The phenomenon of polarization optical bistability in the medium of layered crystals was obtained, in which the transmission band is managed with only the change of polarization of incident radiation. On the basis of the mechanism of polarization control of nanoparticles motion in the tasks of polarization diagnostics of optical fields, the estimation of the coherent features of mutually orthogonal linearly polarized optical fields was performed that also enables to analyze the terms of storage of information about the structure of an optical field.
The impact of temperature, incident light polarization and a weak external magnetic field upon the conditions of optical bistability (OB) realization in the exciton absorption region of layer semiconductors has been investigated. With the 2Hpolytype PbI2 used as an example, the possibility of obtaining the OB realization region by changing the external factors has been shown. It has been also demonstrated that the change of these parameters can control the position and values of the absorption hysteresis loop of corresponding layer crystal excitation exciton zones.
The paper proposes for consideration an alternative method of creating systems for processing and preserving information on the basis of molecular crystals using the phenomenon of optical bistability. Polarization-dependent nonlinear absorption of the benzene type molecular crystals is responsible for the complex dynamics of exciton processes in the analyzed molecular crystal. It is shown that the multilevel signal realized at the outlet is controlled by the outside effecting factors as well as by the inside effecting factors.
In this work a theoretical study of the interaction between a light beam and an anisotropic nonlinear interferometer has been considered and methods to control the transmission of the microcavity using optical and magnetic fields have been developed. It has been demonstrated that anisotrophy of intracavity media determines the differences in transmission functions for various polarization modes and produces polarization instability. Varying spectroscopic parameters of the resonant medium and parameters of the anisotropic element, different types of intensity self-oscillations for different polarization modes can be obtained. To control the characteristics of nonlinear interferometer, it is proposed to use an additional light beam whose frequency is tuned into the absorption band from the excited level. The propagation characteristics of periodic magento-optical and dielectric multilayer films made of alternating layers of these materials having a symmetric periodicity with the center of the structure under a magnetic field is analyzed. The magnetic induction on this type of materials is temperature dependent and modifies the transmission and reflection characteristics of these structures. This kinds of structures, gives us the possibilities for an additional controlling of the characteristics of nonlinear interferometer.
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.