Hetero-integration of diamond nanostructures on AlGaN-based photonic circuits
D. Bermeo Alvaro1,2, S. Gündoğdu1,2, L.M. Rektorschek2, M.E. Stucki1,2, M.H. van der Hoeven2, J.M. Bopp2,1, T. Kolbe1, S. Hagedorn1, M. Weyers1, T. Pregnolato1,2, and T. Schröder2,1
Published in:
Conf. on Lasers and Electro-Optics/Europe and European Quantum Electronics Conf. (CLEO/Europe-EQEC 2025), Munich, Germany, Jun. 23-27, ISBN: 979-8-3315-1252-1, ce-5-3 (2025).
Abstract:
Recently, many efforts have been made in the development of large quantum networks, which rely on the generation and distribution of entanglement between their nodes. Spin-photon interfaces are crucial for these networks, as they enable the distribution and storage of quantum information [1]. Promising candidates for these interfaces are color centers in diamond since these contain individually controllable, optically active spin states with long coherence times [2, 3]. Moreover, highly efficient interfaces can be achieved when those color centers are embedded in photonic crystal cavities, which enhance the light-matter interaction and boost the emission rate of photons generated by the coherent zero-phonon-line transition [4]. While the diamond substrate allows for the nanofabrication of such devices [5], achieving a monolithic platform that will take advantage of those photonic crystal cavities on a large scale remains a challenge. Realizing such diamond monolithic platforms requires diamond thin films on a low-refractive-index material or an entire suspended configuration which represents a fabrication challenge [6]. To overcome these limitations, we propose the hetero-integration of diamond nanostructures (Fig. 1 a)) into AlGaN-based photonic circuits as schematically illustrated in Fig.1 b,c). AlGaN/AlN platform has shown promising properties for developing integrated photonic chips [7]. By embedding diamond nanostructures within AlGaN-based circuits, we aim to create highly efficient, scalable spin-photon interfaces.
1 Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
2 Department of Physics, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
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