Propagation and Parametric Amplification in Four-Wave Mixing Processes: Intramolecular Coupling and High-Order Effects
Por:
Paz J.L., Espinoza-Montero P.J., Loroño M., Torres F.J., González-Paz L., Márquez E., Vera-Villalobos J., Mora J.R., Moncada F., Alvarado Y.J.
Publicada:
1 ene 2022
Resumen:
A strong pump-power dependence of the four-wave mixing (FWM) signal for an aqueous solution of Malachite green is reported. The characteristics of the pump-power dependence of the nonlinear signal are reproduced by a theoretical model based on the coupling between pump-probe, considering signal fields and propagation effects. The effect of the intramolecular coupling on the nonlinear intensity of the FWM signal is studied using a model molecule consisting of two-coupled harmonic curves of electronic energies with minima displaced in energy and nuclear positions. Two-vibrational states are considered while including non-adiabatic effects for the two-state model. Moreover, the coupling among the field components, as well as the propagation effects, are studied by considering a constant pump-intensity. Our calculation scheme, considering both the intramolecular coupling effects in the description of the molecular structure and the effects produced by the propagation of the FWM signal along the optical length, allows the exponential dependence of the latter, as the intensity of the pumping beam increases. Our treatments do not require the inclusion of other non-resonant processes outside the RWA approximation, due to the consideration of an adiabatic basis. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Filiaciones:
Departamento Académico de Química Inorgánica, Facultad de Química e Ingeniería Química, Universidad Nacional Mayor de San Marcos, Lima, 15081, Peru
Escuela de Ciencias Químicas, Facultad de Ciencias Exactas y Naturales, Pontificia Universidad Católica del Ecuador, Quito, 170143, Ecuador
Departamento Académico de Química Analítica e Instrumental, Facultad de Química e Ingeniería Química, Universidad Nacional Mayor de San Marcos, Lima, 15081, Peru
Grupo de Química Computacional y Teórica (QCT-UR), Facultad de Ciencias Naturales, Universidad del Rosario, Bogotá, 111711, Colombia
Instituto de Simulación Computacional (ISC-USFQ) and Grupo de Química Computacional y Teórica (QCT-USFQ), Departamento de Ingeniería Química, Universidad San Francisco de Quito (USFQ), Quito, 170143, Ecuador
Laboratorio de Genética y Biología Molecular (L.G.B.M), Departamento de Biología Facultad Experimental de Ciencias (F.E.C), Universidad del Zulia (LUZ), Maracaibo, 4005, Venezuela
Grupo de Investigaciones en Química y Biología, Departamento de Química y Biología, Facultad de Ciencias Exactas, Universidad del Norte, Carrera 51B, Km 5, Vía Puerto Colombia, Barranquilla, 081007, Colombia
Escuela Superior Politécnica del Litoral, Facultad de Ciencias Naturales y Matemáticas, Guayaquil, 999165, Ecuador
Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, México City, 04510, Mexico
Centro de Investigación y Tecnología de Materiales (CITeMA), Laboratorio de Caracterización Molecular y Biomolecular, Instituto Venezolano de Investigaciones Científicas (IVIC), Maracaibo, 4004, Venezuela
gold, All Open Access; Gold
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