https://doi.org/10.1140/epjp/s13360-025-06718-x
Regular Article
Nonlinear optical second and third harmonic generation in InxGa1−xAs/AlyIn1−yAs double-quantum-well structures
School of Information Engineering, Guangdong University of Technology, 510006, Guangzhou, People’s Republic of China
a
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Received:
30
April
2025
Accepted:
3
August
2025
Published online:
15
August
2025
In this paper, the second and third harmonic generation (SHG and THG) in nonlinear optics of AlxIn1−xAs/InyGa1−yAs double-quantum-well structures (DQWs) has been numerically studied. The energy eigenvalues and the corresponding eigenfunctions were determined using effective mass and parabolic band approximations. The nonlinear optical properties of AlxIn1−xAs/InyGa1−yAs DQWs are closely related to their electronic structure and external field responses. The application of an external electric field induces asymmetric distortions to the potential profile of DQWs, which may enhance the dipole matrix elements between subbands compared to single-quantum-well structures. The results reveal that the position and amplitude of the SHG and THG coefficients can be effectively altered by modifying the external electric field and the geometrical parameters. Variations in the width and indium composition of the main well of DQWs have different impacts on the SHG and THG: Narrower well width and lower indium composition enhance SHG, but weaken THG. Additionally, higher indium composition induces blueshifts in SHG and THG. These findings highlight the potential for tailoring the SHG and THG characteristics of AlxIn1−xAs/InyGa1−yAs DQWs by adjusting the quantum well width and applying external electric fields. Such tunability is crucial for the development of advanced optoelectronic devices with customized nonlinear optical properties.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
