Advances in Two-Dimensional THz Spectroscopy: Distinguishing Cascaded Nonlinear Optical Processes in ZnTe

Martin Cross

Research output: Book/ReportPh.D. thesis

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Abstract

The present thesis summarizes recent developments in two-dimensional (2D) terahertz (THz) spectroscopy at DTU, including instrumentation, numerical pulse propagation simulations, and their combined application for distinguishing cascaded and direct nonlinear optical (NLO) process in ZnTe. Chapter 1 begins with a brief motivational introduction to multidimensional spectroscopy,
then delves into a ground-up overview of how 2D terahertz datasets, or ‘maps,’ are created and interpreted. In Chapter 2, we describe the design, development, and configuration of the 2D THz instrument. We discuss the rational behind using what we call ‘2D THz-THz-polarimetry’ as the detection method, as well as its implementation. Additionally, we provide several benchmarks of the instrument. Chapter 3 focuses on the development of numerical pulse propagation simulations. These simulations enable us to isolate the underlying direct and cascaded NLO processes contributing to the measured 2D THz-THz-polarimetric maps. In Chapter 4, we present 2D THz-THz-polarimetric measurements of direct and cascaded NLO processes in ZnTe, alongside corresponding numerical pulse propagation simulations. This comparative analysis allows us to effectively distinguish between cascaded and direct processes.
Finally, we conclude the thesis with a summary of the findings and directions for future research and development.
Original languageEnglish
PublisherTechnical University of Denmark
Number of pages123
Publication statusPublished - 2023

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