Date of Award

12-2019

Document Type

Campus Access Thesis

Degree Name

Master of Science (MS)

Department

Physics, Applied

First Advisor

Chandra Yelleswarapu

Second Advisor

Stephen Arnason

Third Advisor

Mohamad Gharbi

Abstract

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.

Comments

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