SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Information (joint session QI/Q)
Q 11.25: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Optimized diamond inverted nanocones for enhanced color center to fiber coupling — •Cem Güney Torun1, Philipp-Immanuel Schneider2,3, Martin Hammerschmidt2,3, Sven Burger2,3, Tommaso Pregnolato1,4, Joseph. H. D. Munns1, and Tim Schröder1,4 — 1Integrated Quantum Photonics, Humboldt-Universität zu Berlin, Berlin — 2JCMwave GmbH, Berlin — 3Zuse Institute Berlin (ZIB), Berlin — 4Diamond Nanophotonics, Ferdinand-Braun-Institut, Berlin
Fiber coupling of the emission from color centers in diamond, a promising candidate for quantum nodes, is challenging due to the mode mismatches and reduced light outcoupling caused by the total internal reflections. Nanostructures are popular tools utilized to overcome these challanges. Nevertheless, while the fiber coupling properties are crucial for a single mode of indistinguishable photons, this performance of nanostructures is rarely investigated. Here, we simulate the emission of color centers and overlap of this emission with the fundamental fiber modes for a novel nanostructure called inverted nanocone. Using different figures of merit, the parameters are optimized to maximize fiber coupling efficiency, free-space collection efficiency or emission rate enhancement. The optimized inverted nanocones show promising results, with 66% fiber coupling or 83% free-space collection efficiency at the tin-vacancy center zero-phonon line wavelength of 619 nm. For maximum emission rate into a fiber mode, a design with a Purcell factor of 2.34 is identified. Moreover, these designs are analyzed for their broadband performance and robustness against fabrication errors.