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HL: Fachverband Halbleiterphysik
HL 22: Focus Session: Young Semiconductor Forum
HL 22.14: Poster
Dienstag, 19. März 2024, 11:00–15:30, Poster F
Efficient Narrow-Beam Hexagonal Boron-Nitride Single-Photon Source — •Johann A. Preuß1, Helge Gehring1,2, Robert Schmidt1, Lin Jin1,2, Daniel Wendland1,2, Johannes Kern1, Wolfram H.P. Pernice1,2,3, Steffen Michaelis de Vasconcellos1, and Rudolf Bratschitsch1 — 1University of Münster, Institute of Physics and Center for Nanotechnology, 48149 Münster, Germany — 2University of Münster, Center for Soft Nanoscience, 48149 Münster, Germany — 3Kirchhoff-Institute for Physics, University of Heidelberg, 69120 Heidelberg, Germany
Robust quantum light sources are important for creating quantum networks. Hexagonal boron nitride (hBN) and other 2D materials host single-photon emitters that offer bright emission, even at room temperature, rendering them promising for quantum applications. However, efficient photon collection is difficult due to their wide-angled emission pattern. To enhance light collection, we 3D-printed polymer microlenses onto individual hBN nanocrystals, to collimate single-photon emission into a low-divergent beam. Photoluminescence and photon correlation measurements demonstrate that our ultra-low fluorescence photoresin does not alter the spectrum of the emitters and preserves the single-photon character of the emitted light. Importantly, by analyzing the emission pattern, we show that the lenses efficiently collimate the emission to angles below 5°, enabling the use of collection lenses with low numerical apertures or direct coupling into optical fibers.
Keywords: hexagonal boron nitride; single-photon emitter; 3D-printing; micro lenses; photoluminescence