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HL: Fachverband Halbleiterphysik

HL 61: Focus Session: Tailored Nonlinear Photonics I

HL 61.1: Hauptvortrag

Donnerstag, 19. März 2020, 09:30–10:00, POT 51

Supercontinuum second-harmonic generation spectroscopy of 2D semiconductors — •Steffen Michaelis de Vasconcellos — Institute of Physics and Center for Nanotechnology, University of Münster, Germany

Two-dimensional semiconductors such as MoS₂ or WS₂ and their heterostructures have recently emerged as promising material systems for novel optoelectronic devices due to their unique electrical, mechanical, and optical properties. Several of these atomically thin materials are particularly suited for nonlinear light-matter interactions. Their strong optical nonlinearity, broadband and tunable optical absorption, and ultrafast response have been successfully employed in all-optical modulators, lasers, wavelength converters, and optical limiters. The prototypical nonlinear process second-harmonic generation is a powerful tool to gain insight into nanoscale materials, because of its dependence on the crystal symmetry and electronic structure. We have developed a new method to perform ultra-broadband SHG spectroscopy, which provides access to the frequency-dependent nonlinear susceptibility χ⁽²⁾ of atomically thin materials and allows for the identification of excitonic resonances.