https://doi.org/10.1140/epjb/s10051-022-00455-1
Regular Article - Solid State and Materials
Comparison of the nonlinear optical properties of asymmetrical and symmetrical quantum wells
Institute of Applied Technology, Thu Dau Mot University, Binh Duong Province, Vietnam
Received:
20
September
2022
Accepted:
13
November
2022
Published online: 27 November 2022
In this work, a detailed comparison of the nonlinear optical properties (NLOPs), including the absorption coefficients (ACs) and the refractive index changes (RICs) of symmetrical parabolic (SP) and asymmetrical semi-parabolic (ASP) quantum-wells (QWs) are investigated by utilizing the compact density matrix approach and iterative procedure. The wave functions of one electron, as well as its energy eigenvalue in the SPQW and the ASPQW, are also obtained by applying the effective mass approximation. Numerical calculations on GaAs/AlGaAs material reveal that the ACs and the RICs in both the SPQW and the ASPQW are affected strongly by the incident optical intensity (I) and the confining frequency (
), and depend sensitively on the relaxation time (T). Furthermore, if it is desired to obtain large ACs/RICs then a relatively weaker I and lower should be chosen. However, the nonlinear (third-order) component influence is very important in the relatively large I case and cannot be neglected when examining the nonlinear optical features of both the SPQW and the ASPQW. More importantly, the total AC and the total RIC in the SPQW always are larger than those in the ASPQW. In addition, if we choose an optimized confining frequency for the SPQW, then we will get larger ACs/RICs.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022. 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.
