Publisher’s Note: “Response functions for dimers and square-symmetric molecules in four-wave-mixing experiments with polarized light” [J. Chem. Phys. 123, 044102 (2005)]

ABSTRACTInformation about quantum dot (QD) asymmetry is derived by analyzing the polarization properties of the time-integrated four wave mixing (FWM) signal. The lowering of QD symmetry results in the splitting of bright J= +/-1 exciton states. This causes the polarization oscillation of circularly excited excitons between these two split states. In a QD ensemble with a random distribution in the exciton level splitting, this results in the decay of the difference in FWM signals observed in scattering of σ+ and σ+ polarized light on the population grating created by two σ+ pulses, the decay time reflecting the degree of QD asymmetry. We have investigated the decay time of the difference in two polarized signals for quantum dots of equal size, grown in a glass matrix under different conditions. Increasing growth temperature and decreasing growth time lead to lowering of QD symmetry. We discuss this experimental result in terms of kinetics of nanoparticle growth in glass.

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Вырожденное четырехволновое взаимодействие на пропускающих голографических решетках в кристалле Bi-=SUB=-12-=/SUB=-TiO-=SUB=-20-=/SUB=- среза (110)

Журнал технической физики ◽

10.21883/jtf.2021.05.50697.322-20 ◽

2021 ◽

Vol 91 (5) ◽

pp. 832

Author(s):

В.Н. Навныко ◽

С.Ф. Ничипорко ◽

А.В. Макаревич ◽

С.М. Шандаров

Keyword(s):

Reflection Coefficient ◽

Polarized Light ◽

Orientation Angle ◽

Four Wave Mixing ◽

Optimal Choice ◽

Crystal Thickness ◽

Wave Mixing ◽

Holographic Gratings ◽

Piezoelectric Effects ◽

Phase Amplitude

The regularities of the stationary degenerate four-wave mixing on transmission holographic gratings formed in the Bi12TiO20 crystal of the (110)-cut are analyzed. The system of differential equations has been obtained; this system that can be used to find the components of the vector amplitudes of linearly polarized light waves in the case of four-wave mixing on phase and phase-amplitude holographic gratings. The theoretical model take into account the linear electrooptic, the photoelastic and the inverse piezoelectric effects, as well as natural optical activity, circular dichroism and crystal absorption. The values of the orientation angle and the crystal thickness where the reflection coefficient can reach maximum values are determined. It was experimentally found that the reflection coefficient can reach 2.4 with an optimal choice of the orientation angle in the Bi12TiO20 crystal of (110)-cut with the thickness of 7.7 mm. It is shown that the best agreement between theoretical and experimental data is achieved if the phase-amplitude structure of transmission holographic gratings formed in the Bi12TiO20 crystal is taken into account in the mathematical model of diffraction.

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