Electro-Optical Modulation of the Nonlinear Optical Response in a GaAs/AlGaAs Symmetric Multiple Quantum Well System Dagua-Conda, Carlos Alberto Gil-Corrales, John Alexander Herrero Hahn, Rebeca Victoria Mora-Ramos, Miguel Eduardo Morales, Álvaro Luis Duque, Carlos Alberto GaAs/AlGaAs symmetric multiple quantum well system Intersubband transition energies Electro-optical modulation Nonlinear optical response External fields modify the confinement potential and electronic structure in a multiple quantum well system, affecting the light–matter interaction. Here, we present a theoretical study of the modulation of the nonlinear optical response simultaneously employing an intense non-resonant laser field and an electric field. Considering four occupied subbands, we focus on a GaAs/AlGaAs symmetric multiple quantum well system with five wells and six barriers. By solving the Schrödinger equation through the finite element method under the effective mass approximation, we determine the electronic structure and the nonlinear optical response using the density matrix formalism. The laser field dresses the confinement potential while the electric field breaks the inversion symmetry. The combined effect of both fields modifies the intersubband transition energies and the overlap of the wave functions. The results obtained demonstrate an active tunability of the nonlinear optical response, opening up the possibility of designing optoelectronic devices with tunable optical properties. 2025-07-08T09:23:18Z 2025-07-08T09:23:18Z 2025-06-12 journal article Dagua-Conda, C.A.; Gil-Corrales, J.A.; Herrero-Hahn, R.V.; Mora-Ramos, M.E.; Morales, A.L.; Duque, C.A. Electro-Optical Modulation of the Nonlinear Optical Response in a GaAs/AlGaAs Symmetric Multiple Quantum Well System. Physics 2025, 7, 22. [DOI: 10.3390/physics7020022] https://hdl.handle.net/10481/105109 10.3390/physics7020022 eng http://creativecommons.org/licenses/by/4.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Atribución 4.0 Internacional MDPI