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Journal of Physics Conference Series

Femtosecond correlated transient holography in CdS crystal under two-quantum excitation

В. В. Самарцев, A V Leontiev, Tatiana G. Mitrofanova

Published May 1, 2016• 1 citation
Publisher

Abstract

This paper is devoted to the discussion of a possibility of the femtosecond correlated transient holograms recording in CdS crystal under two-quantum excitation.
DOI
10.1088/1742-6596/714/1/012014

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The possibility and the conditions of the formation of correlated “gratings” of electrons and their spins in a semiconductor film containing CdSe/CdS nanoparticles (which are the quantum dots) have been studied. Notably, the induction of electron spin “gratings” on quantum dots has been considered for the first time. We have suggested to perform an excitation of the film in the two photon absorption mode using two crossed (at an angle of 60?) femtosecond laser beams. As a result of the excitation, two nonequilibrium “gratings” are induced simultaneously in the excitation area of the film. If the exciting pulses have the same polarizations, then induced “gratings” of electrons are formed. However, in the case when the exciting pulses have mutually orthogonal polarizations, the formation of induced “gratings” of electron spins takes place. The same exciting pulses excite the electrons of CdSe/CdS nanoparticles into a superposition state. Then the free induction decay signal is generated. This signal being diffracted by induced “gratings” plays the role of a probe pulse in the suggested experimental scheme. The diffracted signals propagating in two mutually opposite directions are correlated (i.e., they are identical). Their wavefronts can carry the correlated transient holograms. Other possible applications of correlated “gratings” (in spintronics and in coherent femtosecond laser spectroscopy) are also discussed.
The possibility of quantum holography in the medium of in homogeneously broadened two-level atoms for two-photon regime of operation proposed by A. Rebane is discussed and peculiarities of such holographic process are considered. The experimental scheme for recording of such holograms is suggested. The conditions for realization of quantum holographic process with this scheme are considered. Also, the original approach for quantum holography in homogeneously broadened three-level atomic system using “stopping of light” procedure is proposed and the theory of such process is constructed