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College Physics

Theoretical study on optical bistability switching based on photoisomerization reverse saturable absorption of azobenzene molecules

Hui Wang

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

The characteristic of optical bistability switching of azobenzene molecules is discussed.First,we compute the coefficient of reverse saturable absorption based on the model of photoisomerization of azobenzene molecules.Second,we simulate and compute the process of bistability switching based on reverse saturable absorption.The result shows that the reverse saturable absorption based on photoisomerization of azobenzene molecules can realize full optical switches of bistability.We also discusse the Trans isomer σT,the Cis isomer σC and the thermal constant K to the optical bistability influence.

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The characteristic of optical bistability switching of azobenzene molecules is discussed.First,we compute the coefficient of reverse saturable absorption based on the model of photoisomerization of azobenzene molecules.Second,we simulate and compute the process of bistability switching based on reverse saturable absorption.The result shows that the reverse saturable absorption based on photoisomerization of azobenzene molecules can realize full optical switches of bistability.We also discusse the Trans isomer σT,the Cis isomer σC and the thermal constant K to the optical bistability influence.
A theoretical study of the steady mirorless optical bistability,based on the photoisomerization of azobenzene,was reports.Firstly, the transmissions due to the saturated absorption of azobenzene molecules have been calculated. Then, the mirrorless optical bistability processes have been calculated under different absorption cross_sections σ_T and σ_C for trans and cis azobenzene molecules respectively.Finally,the thermal constant K and its influence on the optical bistability has been discussed.
We present a novel approach to achieving intrinsic optical bistability and multistability through the interplay between saturable and reverse saturable absorption. Our findings reveal that the stable points on the optical bistability curve align with the switching points of intensity-dependent nonlinear absorption. By analyzing the optical properties of a four-level cascade quantum system, we demonstrate that these switching behaviors can be triggered by applying laser fields to induce nonlinear absorption. Furthermore, we propose a comprehensive model to describe the intensity-dependent nonlinear absorption within this quantum system. Finally, it is shown that the optical bistability switches to the multistability when the detuning of applied fields exceeds the multi-photon resonance condition.
Theoretical analysis is presented to search for the purely absorptive optical bistability in a Fabry-Perot cavity filled with a saturable absorber. A simple model of singlet absorption is used on numerically solving the relationships between the input and output light fields. The proposed model corresponds well to organic compounds considered as novel optical materials with third-order optical nonlinearities. The effects of saturable absorber parameters on the output light characteristics are studied and purely absorptive optical bistabilities are shown numerically to search for bistable behaviour. The simulated results are indications for promising applications in optical switches for all-optical communication networks.
The main achievements in our research on the physical phenomena of the excited-state nonlinear absorption in a molecular system and its applications in photonic technology are described. In the first part of this paper, some energy-level models and rate-equations are used to explain various mechanisms of the excited-state nonlinear absorption under different conditions, such as reverse saturable absorption caused by the triplet and/or the singlet excited-state absorption; saturable absorption due to the first and/or the second singlet excited-state absorption; and the excited-state nonlinear absorption induced by two-photon absorption. The experimental results for metal-organic and C 60 materials irradiated by ps and ns laser pulses are consistent with the simulated curves of the transmittance versus fluences. In the second part, the applications of excited-state nonlinear absorption in photonic techniques including optical bistability, optical switching, optical limiting, optical modulation, optical logic and optical storage are introduced. The working principles of the photonic devices based on the excited-state nonlinear absorption are presented. The experimental characteristic curves are found in good agreement with the theoretical simulations for these devices.
The influence of transverse effects on optical bistability in Fabry-Perot cavity filled with saturable absorber was numerically investigated. A simple model of singlet absorption was used on numerically solving the relationships between the input and output light fields. The proposed model corresponds well to organic compounds considered as novel optical materials with third-order optical nonlinearities. The proposed optically bistable systems were demonstrated for two organic dyes of fluorescein and rhodamine 6G dispersed in transparent solid matrices. Their optically bistable behaviour was anticipated considering the homogeneous and Gaussian distribution of light energy in the radial direction. Most notable cases are discussed related to the changes of the Gaussian beam radii, positive feedback conditions in the Fabry-Perot cavity and considering linear and nonlinear absorption parameters of the organic media. The simulation results enabled us to establish numerically thresholds of Fabry-Perot mirror reflectance and Gaussian beam radius for both nonlinear organic materials, above which absorptive optical bistability can occur. The results can be helpful in design of optical switches for all-optical communication networks.
Using computer simulation, we show a possibility of ultrafast switching between stable states of an optical bistable device based on nano-film of semiconductor. Optical bistability occurs because of nonlinear dependence of semiconductor absorption coefficient on electric field potential. Electric field is induced by a laser pulse due to charged particles generation. The main feature of this bistable element is low absorption energy, which is necessary for switching, in comparison with bistable element based on other physical mechanism of laser energy absorption. For computer simulation of a problem under consideration a new finite-difference scheme is proposed using the original iterative process.