https://doi.org/10.1140/epjp/s13360-024-05411-9
Regular Article
Two- and three-photon absorption cross-section investigation in nanometer-sized heterodimer and heterotrimer structures
Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran
b ndaneshfar@gmail.com, ndaneshfar@razi.ac.ir
Received:
11
April
2024
Accepted:
30
June
2024
Published online:
11
July
2024
In the present work, the cross section of two-photon absorption (2PA) and three-photon absorption (3PA) in a hybrid nanostructure molecule consisting of a semiconductor quantum dot (QD) modeled as a two-level quantum system placed near plasmonic metal nanoparticles (MNPs) subjected to a resonant CW excitation is investigated using the density matrix formalism and applying the rotating wave approximation. For this purpose, two configurations including a heterodimer constituted by two particles and a heterotrimer made from three particles are studied. In addition to studying the cross section of 2PA and 3PA, we discuss the second hyperpolarizability (nonlinear polarizability) of QD in these hybrid structures based on QDs and plasmonic nanoparticles, because sometimes the measurement of the second hyperpolarizability of QD is useful and can help us in obtaining more information about the nonlinear behavior of systems and molecules. It is shown that 2PA and 3PA of a semiconductor QD in a hybrid molecule can be influenced strongly by the presence of nearby plasmonic MNPs. Furthermore, we investigate the sensitivity of 2PA to the size of QD in a nano-scale heterotrimer system, which is a way of controlling optical absorption.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
