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Surface-induced optical bistability in coupled exciton-phonon systems

D. L. Lin, Xiao-shen Li, Thomas F. George

Published Nov 1, 1990• 0 citations
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Abstract

Abstract Nonlinear optical responses of exciton-phonon coupling systems near a reflecting surface are investigated. For a polydiacetylene chain lying parallel to the surface, optical bistability induced by the surface is discovered. It is also found that the threshold and contrast of the bistability can be controlled by adjusting the distance of the system from the surface, and that vacuum fluctuations are reduced whenever the bistability occurs. The nature of the bistability and its origin are discussed.

Related papers

Optical nonlinearity in coupled exciton-phonon systems near metal surfaces

Xiao-Lin Li, D. L. Lin, Thomas F. George

Surface effects on optical bistability and pump-probe processes for coupled exciton-phonon systems are studied theoretically. When a laser beam is directed on an excitron-phonon coupling system inside an optical cavity, the cavity field intensity is investigated as a function of the driving field intensity for various distances between the sample and a metallic surface representing one of the mirrors of the cavity. It is found that the direction of switch of the optical bistability can be controlled by adjusting the distance from the surface. For a strong laser pump field and a weak probe field directed on this system, the pump-field-induced absorption spectrum is investigated for different distances between this sample and the metal surface. It is found that the position and line shape of the spectrum are significantly changed due to the presence of the surface.

Unknown eBooks•Oct 1, 1991•0 citations

New type of optical bistability in polymers mediated by phonons

Xiao-shen Li, D. L. Lin, Thomas F. George +1 more

A new type of optical bistability mediated by phonon and virtual-exciton coupling is suggested for polymers. Numerical results with parameters pertaining to polydiacetylene-toluene-sulfonate are given as an illustration. The stability of the steady-state solution is examined, and the physical mechanism responsible for the bistability is discussed.

Physical review. B, Condensed matter•Feb 15, 1990•20 citations

External optical feedback for exciton-phonon systems in optical cavities

X. Li, W. Cai, Roberta Marani +1 more

Effects of external optical feedback on the behavior of input-cavity-field relations are investigated for an electron–phonon system inside an optical cavity exposed to an incident laser field. The external feedback by conventional mirrors and by phase-conjugate mirrors is considered separately. Steady-state results are obtained numerically for a typical phonon–exciton material of polydiacetylene. In the case of conventional external feedback, the threshold, the contrast, and the switching behavior of optical bistability can be changed by adjustment of the feedback parameters without causing any instability, whereas in the case of phase-conjugate feedback the cavity field intensity shows five states corresponding to a single input field intensity as long as the feedback is strong enough. However, all these states are unstable because of the amplified phase-conjugate reflection, which limits the application of phase-conjugate mirrors in optical multistabilities.

Journal of the Optical Society of America B•Sep 1, 1994•0 citations

Transient dynamics in excitonic optical bistability in polymers

Xinfu Xia, Xiao-shen Li, D. L. Lin +1 more

Transient behavior in the optical bistability mediated by phonon-mode and virtual-exciton coupling is studied for an electron-phonon-coupling system, such as polydiacetylene toluene sulfonate. Numerical calculations are used to analyze the evolution between bistable states, and switching behavior and Rabi oscillations are found.

Physical review. B, Condensed matter•Mar 1, 1991•5 citations

Exciton–Phonon Mechanism of Optical Bistability

Bohdan M. Nitsovich, O. V. Krechivskii, G. M. Pestryakov

Abstract A joint effect of exciton–phonon and exciton–exciton interactions on optical properties of semiconductors is studied. In these substances the exciton density is shown to be a multivalued function of incident light intensity and the frequency and temperature conditions under which the optical bistability arises are specified. Investigation of nonlinear optical properties of semiconductors with account for the indirect phototransitions exhibits that both multistable optical states and the bistable ones distinguished by a complicated dynamics of the switching may be observed in such systems.

physica status solidi (b)•Dec 1, 1988•2 citations

Phonon-mediated excitonic optical bistability in polymers

X. S. Li, D. L. Lin, Thomas F. George +1 more

For a polymer inside an optical cavity, optical multistability mediated by phonon modes and virtual exciton coupling is investigated. The cavity field, excitons, and phonon modes are treated as damped oscillators, and the equations of motion for the dynamical variables are obtained by applying Dekker's theory for dissipative systems. Steady-state results are obtained numerically for polydiacetylene [bis(p-toluene sulfonate)] with the input field frequency on or off resonance with the cavity field. The variation of the cavity-field intensity follows a reversed hysteresis loop on resonance, while it may follow either a normal or a reversed hysteresis loop off resonance depending on the course of change of the driving-field intensity at the unstable turning point. The variation is inverted when the detuning changes its sign. It is also found that the virtual excitons, phonon modes, and feedback of the cavity are all indispensable to such tristability.

Physical review. B, Condensed matter•Aug 15, 1990•11 citations
Abstract Nonlinear optical responses of exciton-phonon coupling systems near a reflecting surface are investigated. For a polydiacetylene chain lying parallel to the surface, optical bistability induced by the surface is discovered. It is also found that the threshold and contrast of the bistability can be controlled by adjusting the distance of the system from the surface, and that vacuum fluctuations are reduced whenever the bistability occurs. The nature of the bistability and its origin are discussed.
Surface effects on optical bistability and pump-probe processes for coupled exciton-phonon systems are studied theoretically. When a laser beam is directed on an excitron-phonon coupling system inside an optical cavity, the cavity field intensity is investigated as a function of the driving field intensity for various distances between the sample and a metallic surface representing one of the mirrors of the cavity. It is found that the direction of switch of the optical bistability can be controlled by adjusting the distance from the surface. For a strong laser pump field and a weak probe field directed on this system, the pump-field-induced absorption spectrum is investigated for different distances between this sample and the metal surface. It is found that the position and line shape of the spectrum are significantly changed due to the presence of the surface.
Effects of external optical feedback on the behavior of input-cavity-field relations are investigated for an electron–phonon system inside an optical cavity exposed to an incident laser field. The external feedback by conventional mirrors and by phase-conjugate mirrors is considered separately. Steady-state results are obtained numerically for a typical phonon–exciton material of polydiacetylene. In the case of conventional external feedback, the threshold, the contrast, and the switching behavior of optical bistability can be changed by adjustment of the feedback parameters without causing any instability, whereas in the case of phase-conjugate feedback the cavity field intensity shows five states corresponding to a single input field intensity as long as the feedback is strong enough. However, all these states are unstable because of the amplified phase-conjugate reflection, which limits the application of phase-conjugate mirrors in optical multistabilities.
Abstract A joint effect of exciton–phonon and exciton–exciton interactions on optical properties of semiconductors is studied. In these substances the exciton density is shown to be a multivalued function of incident light intensity and the frequency and temperature conditions under which the optical bistability arises are specified. Investigation of nonlinear optical properties of semiconductors with account for the indirect phototransitions exhibits that both multistable optical states and the bistable ones distinguished by a complicated dynamics of the switching may be observed in such systems.
For a polymer inside an optical cavity, optical multistability mediated by phonon modes and virtual exciton coupling is investigated. The cavity field, excitons, and phonon modes are treated as damped oscillators, and the equations of motion for the dynamical variables are obtained by applying Dekker's theory for dissipative systems. Steady-state results are obtained numerically for polydiacetylene [bis(p-toluene sulfonate)] with the input field frequency on or off resonance with the cavity field. The variation of the cavity-field intensity follows a reversed hysteresis loop on resonance, while it may follow either a normal or a reversed hysteresis loop off resonance depending on the course of change of the driving-field intensity at the unstable turning point. The variation is inverted when the detuning changes its sign. It is also found that the virtual excitons, phonon modes, and feedback of the cavity are all indispensable to such tristability.