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HL: Fachverband Halbleiterphysik
HL 6: Materials and Devices for Quantum Technology I
HL 6.3: Vortrag
Montag, 17. März 2025, 15:30–15:45, H13
Direct printing of microlenses on hexagonal boron nitride to improve light outcoupling — •Daniel Klenkert1,2, Paul Konrad2, Andreas Sperlich2, Vladimir Dyakonov2, and Jens Ebbecke1 — 11Technology Campus Teisnach Sensor Technology, Deggendorf Institute of Technology, 94244 Teisnach — 2Experimental Physics 6, Julius-Maximilians-University Würzburg, 97074 Würzburg
Optically active defects in hexagonal boron nitride (hBN) have attracted wide research interest in the field of quantum technology. Solid immersion lenses can be employed in order to increase light outcoupling and thus the external quantum efficiency (EQE) of such defects. These lenses are, however usually created by etching them into the surface of the host material, which makes them rather unsuitable for 2D materials such as hBN.
Here we present an alternative approach: direct printing of polymer microlenses onto hBN using the two-photon polymerization technique. This strategy is not limited to bulk crystals, but can also be applied to thin films. Using a ceramic hybrid polymer with low fluorescence and high optical transparency, hemispherical lenses were directly printed on macroscopic hBN crystals and on thin flakes to demonstrate the feasibility and EQE enhancement of this approach.
Keywords: hexagonal boron nitride; two-photon polymerization; quantum emitter; 2D materials; 3D printing