Confocal photoluminescence mapping of diamond photonic crystal cavity modes for the silicon vacancy center
Lin Jin (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Taminiau Lab, Universität Münster, Universität Heidelberg)
Mark Ulanov (Universität Heidelberg)
Stefan Dietel (University of Ulm and Geriatric Center Ulm/Alb-DonauAgaplesion Bethesda Hospital)
Lev Kazak (University of Ulm and Geriatric Center Ulm/Alb-DonauAgaplesion Bethesda Hospital)
Nicola Lang ( Fraunhofer Institute for Applied Solid State Physics (IAF))
Peter Knittel ( Fraunhofer Institute for Applied Solid State Physics (IAF))
Fedor Jelezko (University of Ulm and Geriatric Center Ulm/Alb-DonauAgaplesion Bethesda Hospital)
Wolfram Pernice (Universität Münster, Universität Heidelberg)
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Abstract
Diamond photonic crystal cavities offer exceptional properties for interfacing color centers in diamond to integrated photonic circuits. Leveraging Purcell enhancement of the color centers’ emission into the zero-phonon line, the development of high quality, low mode volume single-crystal diamond resonators remains one of the key challenges for building diamond quantum networks. In this paper, we present both a robust, versatile photonic crystal design as well as a scalable fabrication process realizing suspended nanobeam cavities. Measurements of confocal microscopy with broadband excitation yield quality factors of more than 5000. We further demonstrate a fast and facile characterization of our structures based on confocal photoluminescence imaging. This method not only provides a more detailed look at the higher order modes within diamond nanobeam resonators but also serves as a non-destructive diagnostic of the modes’ susceptibility to fabrication imperfections, providing critical feedback for scalable, high-yield integrated quantum photonic device development.