Correlated stimulated photon echo signals under three-photon femtosecond excitation of CdSe–CdS colloidal quantum dots

Abstract

The possibility and conditions of the correlated signals of stimulated photon echo (SPE) generation under three-photon femtosecond excitation of a sample, which is an ensemble of N semiconductor nanoparticles, are investigated. Each of these nonoparticles consists of a CdSe core covered by a CdS shell. The phase matching conditions for correlated SPE signal formation in such a sample are obtained.

Combined photon-echo, luminescence and Raman spectroscopies of layered ensembles of colloidal quantum dots

“…[26] and references therein). In recent years, there is considerable interest to study semiconductor quantum dots and their ensembles using PE [27][28][29][30][31]. Finally, depend ences of various characteristics of QD-systems (as obtained with the above-mentioned methods) on the temperature, external fields, and other parameters add new knowledge on the nature of processes therein [32,33].…”

Ultrafast optical dephasing in experiments on femtosecond and incoherent photon echo: numerical modeling

“…Photon echo is one of the most appropriate experimental techniques for studying the processes of optical dephasing in various media, including gases [1][2][3], liquids [4], solids [5][6][7][8], amorphous media [9][10][11] and nanostructures [12][13][14]. The phenomenon of the photon (light) echo was theoretically predicted by the Soviet physicists Kopvillem and Nagibarov from the Kazan Physical-Technical Institute (KPTI) [15], and then experimentally discovered by the American physicists Abella, Kurnit and Hartmann [16].…”

Correlated signals of the accumulated photon echo on CdSe – CdS quantum dots

“…Then, in paper [2], it was shown that the signals of stimulated photon echo (SPE) can also be correlated since they are in fact the same signals of free induction decay formed in a nonreversible system. Now let us pay attention to the fact that the correlation can exist also between the signals of accumulated photon echo (APE).…”

“…The theory of EPRgratings formation in nanostructured semiconductor sample under its multi-photon excitation by laser radiation was presented in [7]. The special case of the sample containing CdSe-CdS colloidal quantum dots was discussed in [2]. …”