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Excitonic optical bistability in n-type doped semiconductors

Nguyen Ba An, Le Thi Cat Tuong

Published Jul 1, 1991• 0 citations
OpenAlex

Abstract

A resonant monochromatic pump laser generates coherent excitons in an n-type-doped semiconductor. Both exciton–exciton and exciton–donor interactions come into play. The former interaction can give...

Related papers

Excitonic optical bistability in n-type-doped semiconductors

Nguyen Ba An, Le Thi Cat Tuong

A resonant monochromatic pump laser generates coherent excitons in an n-type-doped semiconductor. Both exciton–exciton and exciton–donor interactions come into play. The former interaction can give rise to the appearance of optical bistability, which is heavily influenced by the latter one. When optical bistability occurs at a fixed laser frequency both its holding intensity and hysteresis-loop size are shown to decrease with increasing donor concentration. Two possibilities are suggested for experimentally determinng one of the two parameters of the system, the exciton–donor coupling constant or the donor concentration if the other is known.

Canadian Journal of Physics•Dec 1, 1992•0 citations

Excitonic Bistabilities, Instabilities and Chaos in Laser-pumped Semiconductors

Nguyen Ba An, Dan Trung Nguyen, Hoang Xuan Nguten

Abstract The Hurwitz criteria are used for a stability analysis of the steady state excitonic optical bistability curves in a semiconductor pumped by an exter- nal laser resonant with the exciton level. Besides the middle branch of the bistability curves which is unstable in the sense of the linear stability theory, we have found other domains of instability in the upper and lower branches of the steady state curves. Numerical results show that a possible route to chaos in the photon-exciton system is period-doubling self- oscillation process. The influence of the presence of free carriers that coexist with the excitons is also discussed. 1. Introduction Stability and instability are two sides of matter which are by no means independent but closely related. For example, in case the system state curve develops three branches, it is the unstable behaviour of the middle branch that causes a jumping up or down to the upper or lower branches thus generating the effect of bistability. Bistable devices them- selves may in turn manifest a rich variety of instabilities leading to spontaneous pulsations of both regular and irregular nature. Since 1987 a fully new direction of research dealing with optical self-pulsing and chaos has been orient- ed by the original works of McCall [l], Bonifacio and Lugiato

NASA STI/Recon Technical Report N•Jul 1, 1992•0 citations

Cavityless optical bistability in a thin semiconductor film upon the resonant excitation of excitons and biexcitons

P. I. Khadzhi, S L Gaivan

The bistable properties of a thin semiconductor film under conditions of resonant excitation of coherent excitons and biexcitons by photons in one or two different pulses are studied theoretically.

Physics of the Solid State•May 1, 1998•1 citation

Optical Bistability and Multistability in a System of High Density Excitons and Biexcitons in Semiconductors

P. I. Khadzhi, G. D. Shibarshina, A. Kh. Rotaru +1 more

Abstract Results are given on the investigation of optical bistability and multistability phenomena both, in the exciton range of the spectrum due to exciton‐photon and exciton‐exciton interactions and in the range of two‐photon generation of the biexcitons (excitonic molecules). For each case the steady‐state equations are obtained.

physica status solidi (b)•Jun 1, 1988•17 citations

Quantum theory of excitonic optical bistability

Moira L. Steyn‐Ross, Crispin W. Gardiner

We present a fully-quantum-mechanical theory of the intracavity interaction of coherent light with semiconductors. Interaction is assumed to occur via excitons. Using a master-equation approach we include such effects as exciton-lattice and exciton-exciton interactions. In the two cases of high and low exciton densities, steady-state analysis reveals bistability and hysteresis in the system. Bistability of a dispersive and absorptive nature in both exciton number and output intensity, dependent on input intensity is found. The bistability displayed in the high-density case agrees qualitatively with the experimental curves obtained by Gibbs et al. for GaAs. As yet the low-density bistability has not been experimentally observed.

Physical Review A•Jan 1, 1983•47 citations

Strong Light-Semiconductor Interactions in CdS, GaSe and Optical Bistability

В.С. Днепровский, A. I. Furtichev, V. Klimov +4 more

Changes in absorption and refractive index caused by the absorption of laser light in CdS and GaSe ("dynamic” nonlinearities which may lead to optical bistability /OB/) were investigated. Nonlinear effects may be very strong ("giant" nonlinearities) due to the resonant enhancement near the sharp band edge in the case of resonant excitation of excitons or interband transition.

Topical Meeting on Optical Bistability (OB)•Jan 1, 1988•0 citations
A resonant monochromatic pump laser generates coherent excitons in an n-type-doped semiconductor. Both exciton–exciton and exciton–donor interactions come into play. The former interaction can give rise to the appearance of optical bistability, which is heavily influenced by the latter one. When optical bistability occurs at a fixed laser frequency both its holding intensity and hysteresis-loop size are shown to decrease with increasing donor concentration. Two possibilities are suggested for experimentally determinng one of the two parameters of the system, the exciton–donor coupling constant or the donor concentration if the other is known.
Abstract The Hurwitz criteria are used for a stability analysis of the steady state excitonic optical bistability curves in a semiconductor pumped by an exter- nal laser resonant with the exciton level. Besides the middle branch of the bistability curves which is unstable in the sense of the linear stability theory, we have found other domains of instability in the upper and lower branches of the steady state curves. Numerical results show that a possible route to chaos in the photon-exciton system is period-doubling self- oscillation process. The influence of the presence of free carriers that coexist with the excitons is also discussed. 1. Introduction Stability and instability are two sides of matter which are by no means independent but closely related. For example, in case the system state curve develops three branches, it is the unstable behaviour of the middle branch that causes a jumping up or down to the upper or lower branches thus generating the effect of bistability. Bistable devices them- selves may in turn manifest a rich variety of instabilities leading to spontaneous pulsations of both regular and irregular nature. Since 1987 a fully new direction of research dealing with optical self-pulsing and chaos has been orient- ed by the original works of McCall [l], Bonifacio and Lugiato
We present a fully-quantum-mechanical theory of the intracavity interaction of coherent light with semiconductors. Interaction is assumed to occur via excitons. Using a master-equation approach we include such effects as exciton-lattice and exciton-exciton interactions. In the two cases of high and low exciton densities, steady-state analysis reveals bistability and hysteresis in the system. Bistability of a dispersive and absorptive nature in both exciton number and output intensity, dependent on input intensity is found. The bistability displayed in the high-density case agrees qualitatively with the experimental curves obtained by Gibbs et al. for GaAs. As yet the low-density bistability has not been experimentally observed.