Features of the interaction of ultrashort laser pulses with a thin semiconductor film caused by the generation of excitons and biexcitons

Khadzhi, P. I.; Corovai, A. V.

doi:10.1070/qe2002v032n08abeh002277

Cited by 29 publications

(6 citation statements)

References 1 publication

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“…The physical reasons of the possibility of an almost instantaneous change in the value of the dielectric constant in the exciton region of the spectrum of semiconductors at high excitation levels are reported in [41][42][43][44][45]. Note that stepwise change in the dielectric permittivity in dependence on the amplitude of the electric field is observed in many crystals and materials in the exciton region of the spectrum at high intensities in the presence of exciton-exciton interactions, because of which biexcitons are formed.…”

Section: The Model Equationsmentioning

confidence: 91%

The smooth distributions of the surface states in a semi-bounded medium with an abruptly change in characteristics in dependence on the field amplitude

Савотченко

2021

Phys. Scr.

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The wave equation with the stepwise nonlinear coefficient on the semi-axis is considered. The boundary problems allowing to obtain the exact solutions of such nonlinear wave equation are proposed. Obtained solutions describe the features of the field localization near the surface covered with fully shielding film in the medium with an abruptly change in characteristics depending on the field. Five types of the surface states with the same structure but different amplitudes, phases, characteristic localization lengths and positions of the domain boundary are found. The features of the wave distributions and the influence of control parameters such as the threshold value of the switching field, surface amplitude and their derivatives on the wave characteristics are analyzed. The change in control parameters allows us to vary the position of the domain boundary.

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Section: The Model Equationsmentioning

confidence: 91%

The smooth distributions of the surface states in a semi-bounded medium with an abruptly change in characteristics in dependence on the field amplitude

Савотченко

2021

Phys. Scr.

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“…Thus, the photons of one and the same pulse induce step transitions from the ground state of the crystal to the exciton state. Then, it generates a transition from the exciton state to biexcitonic state, forming polarization of medium and concentration of quasiparticles, which determine the optical properties [36][37][38][39].…”

Section: The Model Equationsmentioning

confidence: 99%

Propagation of nonlinear surface waves along the interface between a Kerr-type crystal and a medium characterized by stepwise dielectric permittivity

Савотченко

2020

J. Opt.

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The contact of a medium characterized by Kerr nonlinearity and a medium characterized by a stepwise nonlinearity, where the dielectric permittivity depends on the amplitude of the electric field strength, is considered. It is found that an optical domain of finite thickness is formed. Two new types of surface waves are described. The influence of the switching field on the intensity distribution across the interface and on total power flow is analyzed. The intensity at the interface in the case of contact with a nonlinear focusing medium can be maximal, in contrast to the case of contact with a linear medium where the intensity at the interface could not be maximal. The total power flow monotonically decreases with an increase in the nonlinearity parameter and it takes the minimum value at a specific value of the switching amplitude. The largest fraction of the power flow is concentrated on the right side of the optical domain for small values of the switching field starting from a certain value.

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“…A closed set of equations for positive frequency parts of the strength of the electric field E (+) σ (r, t) and macroscopic amplitudes of excitons α (+) σ (r, t) and biexcitons β (+) (r, t) is derived using Hamiltonian (11), ( 1)-( 4) and (12) (see [20,48]):…”

Section: The Model Choicementioning

confidence: 99%

“…Recent considerable advances in the manufacturing of dimensionally confined semiconductor structures have stimulated investigations of their nonlinear optical properties. In particular, in several works the interactions of resonance laser radiation with excitons and biexcitons in thin semiconductor films have been studied [1][2][3][4][5][6][7][8][9][10][11][12][13]. From a purely theoretical perspective, the thin-film approximation allows us to transform the set of nonlinear partial differential equations for the electromagnetic field and the polarization of the medium into a relatively simple set of ordinary differential equations, which admits exact analytical solutions in some cases.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear transmission and reflection of ultrashort laser pulses by a thin semiconductor film under two-photon generation of biexcitons

Beloussov

Khadzhi

Corovai

et al. 2011

J. Phys.: Condens. Matter

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The transmission and reflection of an ultrashort laser pulse by a thin semiconductor film under the conditions of resonance excitation of biexcitons by two photons are theoretically investigated. The numerical solutions of the macroscopic equations are found for various values of the film thickness, the detuning from the two-photon resonance, the laser pulse duration, and the intensity. These equations have been obtained in the framework of the generalized bipolariton model. In this model a biexciton is formed from virtual excitons of four kinds and only some of them interact with the light. It is shown that the thin film substantially transforms the incident pulse. For specific conditions, high and narrow transmission and reflection peaks can appear, or even trains of such peaks. In some cases their height can considerably exceed the amplitude of the incident pulse. The results are compared with similar results obtained on the basis of other models.

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Features of the interaction of ultrashort laser pulses with a thin semiconductor film caused by the generation of excitons and biexcitons

Cited by 29 publications

References 1 publication

The smooth distributions of the surface states in a semi-bounded medium with an abruptly change in characteristics in dependence on the field amplitude

The smooth distributions of the surface states in a semi-bounded medium with an abruptly change in characteristics in dependence on the field amplitude

Propagation of nonlinear surface waves along the interface between a Kerr-type crystal and a medium characterized by stepwise dielectric permittivity

Nonlinear transmission and reflection of ultrashort laser pulses by a thin semiconductor film under two-photon generation of biexcitons

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