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

Download

TEZ_Tolga Orçun ŞENGÖZ.pdf

Date

2023-1-18

Author

ŞENGÖZ, TOLGA ORÇUN

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

223
views

139
downloads

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

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

INVESTIGATION OF DONOR, ACCEPTOR AND SUBSTITUENT EFFECT ON PHTHALIMIDE AND THIENO[3,4-c]PYRROLE-4,6-DIONE BASED DONOR-ACCEPTOR-DONOR TYPE MONOMERS AND POLYMERS Çakal, Deniz; Önal, Ahmet Muhtar; Cihaner, Atilla; Department of Chemistry (2021-11-26) Conjugated organic materials comprise a major field of material chemistry focused on the improvement of new building blocks for the synthesis of novel semiconducting materials with advanced functional properties. Such semiconducting systems have the advantage of low cost, solution processability and flexibility and find many applications in the field of plastic photovoltaics, electrochromics and display technologies. The electronic and optical features of these semiconducting organic materials can be tailor...
Simulations on glow discharge: development and validation of one-dimensional kinetic model by particle in cell/monte carlo collision method Tiryaki, Özgecan; Çakır, Serhat; Department of Physics (2019) Numerical codes for glow discharge plasma simulations were developed by using Particle in Cell/Monte Carlo Collision (PIC/MCC) method. The model is one-dimensional in coordinate space and three-dimensional in velocity space (1d3v). A modification of Direct Simulation Monte Carlo (DSMC) method known as null-collision method was used for particle collisions. MPI and sub-cycling were used for speed up. The code was validated using benchmarks for capacitively coupled helium discharges and tested with three-dime...
SIMULATION CALCULATIONS FOR GOLD CLUSTERS ON THE GAAS(110) SURFACE Erkoç, Şakir; HALICIOGLU, T; TILLER, WA (1992-08-15) Energy- and structure-related properties of small gold clusters deposited on the GaAs(110) surface were investigated in this work using a molecular dynamics procedure. A recently developed potential energy function based on two- and three-body interactions was employed in calculating energies and forces. These calculations produced some consistent results with experiments. The three-body interactions involving As atoms in particular, were found to play an important role in determining favorable binding site...
Nonlinear intersubband optical absorption of Si delta-doped GaAs under an electric field Yildirim, Hasan; Tomak, Mehmet (Wiley, 2006-10-01) We study the nonlinear intersubband optical absorption of a single Si delta-doped GaAs sheet placed in the middle of a GaAs quantum well and subjected to an electric field. The Schrodinger and Poisson equations are solved self-consistently for various electric field strengths. The self-consistent solutions provide us with the correct confining potential, the wave functions, the corresponding subband energies and the subband occupations. The nonlinear optical intersubband absorption spectra are discussed wit...
Numerical studies of Korteweg-de Vries equation with random input data Üreten, Mehmet Alp; Yücel, Hamdullah; Uğur, Ömür; Department of Scientific Computing (2018) Differential equations are the primary tool to mathematically model physical phenomena in industry and natural science and to gain knowledge about its features. Deterministic differential equations does not sufficiently model physically observed phenomena since there exist naturally inevitable uncertainties in nature. Employing random variables or processes as inputs or coefficients of the differential equations yields a stochastic differential equation which can clarify unnoticed features of physical event...

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.