Nanoscale Investigation on Linear and Nonlinear Optical Properties in Layered and Nanostructured Materials

Abstract

This dissertation presents a systematic nanoscale investigation of linear and nonlinear optical properties in layered and nanostructured materials, with particular emphasis on how local structural variations determine optical responses under far-field and polarization-resolved excitation conditions. Twodimensional transition metal dichalcogenides (2D-TMDCs) are widely studied due to their strong excitonic effects, symmetry-dependent nonlinear optical responses, and promising applications in optoelectronic and valleytronic devices. In addition, plasmonic nanostructures provide strong light confinement and local electromagnetic field enhancement through localized surface plasmon resonances, making them important platforms for nanoscale photonics, sensing, and nonlinear optical enhancement. Therefore, these two material systems are chosen as representative platforms to investigate geometry-dependent optical responses. By combining confocal scanning optical microscopy, ultrafast nonlinear spectroscopy, Raman spectroscopy and back focal plane imaging, this work establishes direct correlations between morphology, symmetry, dipole orientation, and optical emission behavior.

Die Dissertation ist gesperrt bis zum 30. Juni 2028 !