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

Magneto-optical bistability of Frenkel excitons

Oleksandr V. Derevyanchuk, Claudia Yu. Zenkova, Valeriy M. Kramar, Bohdan M. Nitsovich, O. Potereiko

Published Jun 4, 2004• 0 citations
Publisher

Abstract

The effect of a magnetic field on the development of the nonlinear absorption in organic semiconductors and on the formation of the hysteresis loop in the incoming-outgoing light intensity dependence has been investigated. The form function of the exciton absorption is calculated, taking into account three factors: the heavy exciton density, the polarization of the excitation wave and the weak magnetic field. It is shown that an appropriate change of these values allows one to form a hysteresis loop, and thus to form optical bistability (OB) with preset parameters.

DOI
10.1117/12.560063

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The effect of a magnetic field on the development of the nonlinear absorption in organic semiconductors and on the formation of the hysteresis loop in the incoming-outgoing light intensity dependence has been investigated. The form function of the exciton absorption is calculated, taking into account three factors: the heavy exciton density, the polarization of the excitation wave and the weak magnetic field. It is shown that an appropriate change of these values allows one to form a hysteresis loop, and thus to form optical bistability (OB) with preset parameters.
The influence of weak external magnetic fields on the conditions of optical bistability (OB) realization in the field of exciton absorption in layer semiconductors has been investigated theoretically. Using the 2H-polytype of PbI2 as an example, it is shown that by changing the intensity of the external magnetic field it is possible to obtain the OB realization region without changing the excitation laser frequency. It is also possible to control effectively the position and size of the hysteresis absorption loop caused by the existence of several exciton zones and due to the peculiar features of the layer crystal structure.
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 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.
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 influence of an external magnetic field on the optical characteristics of the exciton spectra of a semiconductor is studied. It is shown that the diamagnetic shift of the exciton level essentially changes the dynamics of the exciton absorption. The combination of the excitonic and magnetic properties of a crystal in the range of excitonic frequencies gives new opportunities to control the bistable behavior of the crystal. It is revealed that the magnetooptical response of the semiconductor to the laser field gives rise to bistable loops with respect to both the intensity of the incident light and the magnitude of the magnetic field.