Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 2: Nanophotonics and Integrated Photonics I
Q 2.5: Vortrag
Montag, 2. März 2026, 12:45–13:00, P 3
Photoluminescence excitation spectroscopy of color-centers in diamond waveguides integrated in AlGaN/AlN nanophotonic circuits — •Grigory Kornilov1, Alok Gokhale1, Lea Rektorschek1, Domenica Bermeo1,2, Marco Stucki1,2, Francesco Intravaia1, Kurt Busch1, Sinan Gündoğdu1,2, Tommaso Pregnolato1,2, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institut (FBH), Berlin, Germany
Hybrid photonic integrated circuits (PICs) with embedded solid-state quantum emitters enable compact and scalable quantum devices. We have recently proposed a novel platform for integrated photonics based on AlGaN grown on AlN on sapphire. By incorporating air gaps in the structure of the circuits, diamond nanophotonic devices can subsequently be suspended across them, creating hetero-integrated waveguides which enable efficient in- and out-coupling of light. Manufacturing the nanophotonic circuits in a "racetrack" geometry allows transmission experiments to be performed in a single confocal setup. Using this approach, the coupling efficiency of diamond waveguides to the underlying AlGaN/AlN structures is investigated. In addition, photoluminescence excitation measurements are conducted to study the optical properties of individual nitrogen-vacancy centers embedded in the diamond.
Keywords: Photonic integrated circuits; Nitrogen-vacancy centers; Quantum photonics; Heterointegration; Diamond nanophotonics