Environment effects on the nonlinear absorption properties of Methylene blue under different power of excitation beam

• Published in: Journal of molecular liquids Vol. 229; pp. 548 - 554
• Main Authors: Khadem Sadigh, M., Zakerhamidi, M.S., Rezaei, B., Milanchian, K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2017
• Subjects: Hydrogen bond; Intermolecular interaction; Methylene blue; Nonlinear absorption; Z-scan; Intermolecular interaction; Nonlinear absorption; Z-scan; Methylene blue; Hydrogen bond
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2016.12.108

In this paper, the nonlinear optical absorption properties of Methylene blue solutions were studied by open aperture Z-scan technique under a continuous-wave laser irradiation with various input powers. The experimental results show that the mechanism of nonlinear absorption and the calculated coefficients depend highly on the molecular surrounding media properties and the nature of intermolecular interactions. From the experimental results, the contributions of various intermolecular interactions were determined as well. Exploiting these results, it is possible to determine the effective media polarity parameters on the nonlinear responses of optical materials. According to the experimental results, by increasing of excitation beam power, the strong hydrogen bonds with high contributions increase the third order nonlinear responses of Methylene blue molecules. •Environment and excitation power as important factors can control the dopants nonlinearity.•The quantitative relations was obtained for precise studying nonlinearity.•Strong hydrogen bonds increase the nonlinear absorption coefficients.