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Q: Fachverband Quantenoptik und Photonik
Q 43: Quantum Optics and Photonics
Q 43.3: Vortrag
Donnerstag, 12. März 2020, 11:30–11:45, f342
High Q-Factor double resonant Bragg-Cavities: towards efficient Second Harmonic Generation in MoS2 and WS2 — •Heiko Knopf1,2,3, Mathias Zilk1, Simon Bernet2, Franz Löchner1, Nils C. Geib1, Tobias Vogl1, Ulrike Schulz2, Frank Setzpfandt1, Sven Schröder2, and Falk Eilenberger1,2,3 — 1Institute of Applied Physics, Friedrich-Schiller-University, Albert-Einstein-Straße 15, 07745 Jena — 2Fraunhofer Institute of Applied Optics and Precision Engineering IOF, Albert-Einstein-Straße 7, 07745 Jena — 3Max Planck School of Photonics, Albert-Einstein-Straße 7, 07745 Jena
Transition metal dichalcogenides (TMDCs) are 2D-materials with a direct bandgap in a range of 1.0 to 2.5 eV. They exhibit strong second-order nonlinearity per unit thickness, making them interesting for nonlinear light-conversion devices. Due to their small thickness, an interaction enhancement is, however, required for efficient operation. Here we analyze dielectric Bragg mirror based resonators (DBR) for SHG-enhancement, where the DBR provides resonances for both, the fundamental wave and the second harmonic alike. Through careful design and optimization, we optimize the design to exhibit high Q-factors. We then report on the fabrication of such cavities, with an ion-assisted deposition process. We show that high Q-factors at the pump wavelength and the second harmonic is achieved. We then demonstrate enhanced second-harmonic generation and discuss possible generalization schemes.