CONSTRUCTION OF Z-SCAN SETUP AND INVESTIGATION OF NONLINEAR OPTICAL PROPERTIES OF ORGANIC ADDUCTS

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TEZ_Tolga Orçun ŞENGÖZ.pdf

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2023-1-18

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ŞENGÖZ, TOLGA ORÇUN

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Nonlinear optical (NLO) concept became an important and attractive field due to potential applications in physics, chemistry, biology, and energy. There are many materials that can be investigated for their NLO properties such as 2D material and organic compounds. This thesis will cover the steps of construction, description of the optical parts used, experiences during construction processes, and verification of final setup with well-studied chemicals that are Tungsten disulfide and Methylene Blue. After verification of successful construction of the setup, nonlinear optical properties of organic compounds were measured. The studied compounds are based on the family of Tetracyanoethylene (TCNE) and Tetracyanoquinodimethane (TCNQ) based compounds, which are donor–π–acceptor (D-π-A) frameworks. Those frameworks have long conjugation connections, and electrons tend to exchange between acceptor and donor when excited. Thus, we expected and observed strong nonlinear properties. In this study, TCNE and TCNQ based compounds in DCM were explored by home-made Z-scan setup. The family of compounds may help us understand how distinctive donor structures influences nonlinear refractive index and nonlinear absorption coefficient of those compounds. Nonlinear refractive index and nonlinear absorption coefficients of these compounds are compared considering their conjugation length, HOMO-LUMO gaps as the donor groups have changed. It was observed that the TCNQ based compounds showed better nonlinear optical properties in general. In addition, we observed that the nonlinear optical properties showed a strong correlation with good electron transfer quality of the donor group in both TCNQ and TCNE based compounds.

Subject Keywords

Z-Scan technique, nonlinear optical properties, donor-acceptor groups, TCNE and TCNQ based compounds

URI

https://hdl.handle.net/11511/102541

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

T. O. ŞENGÖZ, “CONSTRUCTION OF Z-SCAN SETUP AND INVESTIGATION OF NONLINEAR OPTICAL PROPERTIES OF ORGANIC ADDUCTS,” M.S. - Master of Science, Middle East Technical University, 2023.