Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.5: Poster
Dienstag, 18. März 2025, 18:00–20:00, P1
Probing TMD-nanowire hybrid structures with second harmonic generation. — •Benedikt Mathes, Maximilian Tomoscheit, Edwin Eobaldt, Alexander Zaunick, Carsten Ronning, and Giancarlo Soavi — Institut of Solid State Physics, University of Jena
Hybrid nanostructures have been drawing attention in fundamental science, since they allow to control and engineer the electronic and optical properties of samples. Transition metal dichalcogenide(TMD)-nanowire(NW) hybrid structures could have interesting applications beyond fundamental science, since they allow to tune the lasing properties of NW lasers. To understand the photo-physical response of the hybrid system, it is helpful to measure the optical and electronic response of each of its individual constituent. However, this is in general difficult to achieve. In this work, we solve this problem by showing that polarization-dependent second harmonic generation(SHG) can selectively probe each constituent of a WSe2-ZnO NW hybrid, provided that the subsystems are properly and deterministically aligned. TMDs exhibit a threefold symmetry with two main axes, armchair(AC) and zigzag(ZZ). When excited along the ZZ axis, the SH is emitted along the AC axis, whereas the SH of the NW is always emitted parallel to its long axis. Hence, by aligning the NW along the ZZ axis one can differentiate the emission from NW and TMD with a polarizer in detection aligned along the ZZ or AC axis, respectively. This way, the subsystems of the hybrid structure can be investigated individually, offering new insights into their contribution to the hybrid system.
Keywords: Nonlinear Optics; TMDs; Nanowires; Nanostructures