Date of Award
Campus Access Thesis
Master of Science (MS)
Nonlinear optical materials have good prospect and can be applied in photonics and biomedical applications. Characterization of nonlinear material is important for technological upgrading and devices improvement. Porphyrin is one of the nonlinear organic materials with excellent nonlinear optical properties. Photoacoustic technology is widely applied in medical and optical industry and research of nonlinear optical properties. In this thesis, we combine ultrasonic transducer to obtain photoacoustic signals with z-scan technology to study six new synthesized porphyrins. UV-vis spectrum is to observe linear absorption coefficient of samples, open-aperture z-scan and photoacoustic detector are used for simultaneously measuring the optical and photoacoustic signals, Curve fitting is performed to the experimental data and to get the nonlinear absorption coefficients. Results show that all samples have good nonlinear properties. Further research on variation of nonlinear absorption coefficient with nonlinear on-axis intensity is done to demonstrate the nonlinear properties.
Wang, Shengwei, "Characterization of Nonlinear Properties of New Porphyrins Using Optical and Photoacoustic Z-Scan Techniques" (2019). Graduate Masters Theses. 594.