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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

The peculiarities of polarization bistability, realized in polarization-sensitive materials

Claudia Yu. Zenkova, Ірина Василівна Солтис

Published Sep 30, 2011• 2 citations
Publisher

Abstract

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.

DOI
10.1117/12.916253

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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.
Nonlinear absorption of a molecular crystal in an external magnetic field is considered. The exciton absorption shape functions under polarized laser radiation and a weak magnetic field, as well as the mechanisms responsible for the formation of a hysteresis loop in the dependence of the output light intensity on the applied magnetic field, were studied for the particular case of benzene. It was established that, for the magnetooptical response of the molecular crystal under study, the formation of bistable loops is inverse in character, which makes it possible to monitor and control the behavior of bistable elements in optical logics systems with an external magnetic field at a fixed illumination frequency.
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.
A new mechanism of memory cell formation on structural biological units of the α-helical protein molecules is suggested in this work. The role of Frenkel excitons and "Davydov splitting" in the resonance mechanism of external excitation energy transmission along peptide groups is defined. Using the Green function method was obtained the theoretical bases of the protein cell absorptive power formation under external laser irradiation. The polarization peculiarities of α - protein exciton excitations at such levels of pumping, which allow to obtain a complex outlet signal reaction, were studied. Protein molecules can serve as perspective material for observing the effect of optical bistability. The results of the performed investigations permit to develop one of the lines of the molecular engineering technologies - the creation of molecular memory devices by controlling the laser radiation of the outlet protein molecule.
The influence of the exciton and phonon spectra of layer semiconductors on the conditions of optical bistability (OB) realization in the exciton absorption region is investigated by means of the Green function method. Using the 2H-polytype PbI2 as an example, it has been found that an effective exciton scattering by an oscillation of the bending wave (BW) type leads to the short wave shift of the OB realization region, the decrease of its size, the widening of the OB observing temperature region and to the shift of the hysteresis loop in the direction of greater intensities, the decrease of its height and width. The possibility of observing the polarizable OB, connected with the direction of spreading and the insident light polarization dependence ofthe layer crystal exciton spectra is substantiated in this paper.
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 effect of specific features of the exciton and phonon spectra of layered semiconductors on the conditions of realization of optical bistability in the exciton absorption region has been theoretically investigated by the Green’s function method. By the example of the 2 H polytype of PbI 2 , it is shown that effective exciton scattering from low-energy bending-wave vibrations leads to a blue shift of the frequency range of bistability realization and its narrowing; expansion of the temperature range of bistability observation; and a shift of the hysteresis loop to higher intensities, accompanied by a decrease in its height and width. The possibility of observing polarization optical bistability, which is related to the dependence of the exciton energy spectrum on the propagation direction of a light wave in a crystal, is also substantiated.