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HL: Fachverband Halbleiterphysik

HL 46: Optical Properties

HL 46.2: Vortrag

Donnerstag, 20. März 2025, 10:00–10:15, H15

Material selective Nonlinear Optics on Transition-metal Dichalcogenide - ZnO Nanowire Hybrid Structures — •Maximilian Tomoscheit, Benedikt Mathes, Edwin Eobalt, Alexander Zaunick, Carsten Ronning, and Giancarlo Soavi — Institute of Solid State Physics, Friedrich Schiller University Jena

The nonlinear optical (NLO) properties of any material are described by the complex tensor χ⁽ⁿ⁾, where, for each element of the tensor, the imaginary part mainly appears close to optical resonances. A direct measurement of the complex NLO suscebility is challenging because any NLO measurement is proportional to |χ⁽ⁿ⁾|². A second harmonic generation (SHG) interference measurement from two different materials with χ_ν⁽²⁾ (ν=1, 2), is also proportional to |χ₁⁽²⁾||χ₂⁽²⁾|cosθ, where θ is the phasemismatch. For a hybrid system with non overlapping resonances, if the SH photon energy is off-resonant for one material and resonant for the other, the interference term directly probes the complex NLO suscebility of the resonant material. In this work, we study SH interference in a transition-metal dichalcogenide (TMD) ZnO-nanowire (NW) hybrid structure, and we characterize the complex NLO suscebility of the TMD close to the A-exciton resonance. To be able to measure such interference, the ZnO NW needs to be placed along the armchair direction of the TMD, in our case WSe₂. Preliminary measurements and the results of SH polarization and wavelength dependent measurements will be be presented in this talk.

Keywords: Nonlinear Optics; TMD ZnO Hybrid; Semiconductors; Nanostructures