Berlin 2024 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Diamond and Related Dielectric Materials II

KFM 12.4: Talk

Wednesday, March 20, 2024, 10:50–11:10, TC 010

Diamond dielectric characterization with superconducting LC micro-resonators — •Francesco Mazzocchi, Dirk Strauß, and Theo Scherer — Karlsruhe Institute of Technology, IAM-AWP, Hermann Von Helmholtz Platz 1, 76344, Eggenstein Leopoldshafen

The development of high optical quality, ultra-low losses single crystal diamond windows is paramount for the realization of future nuclear fusion facilities like DEMO, given the foresaw increase in power of microwave ECRH systems. Precise determination of the dielectric characteristics (εr and tanδ) of these innovative materials have so far relied on techniques involving Fabry-Perot microwave open resonators in various configurations. High Q, superconducting thin film resonators can be effectively used to determine dielectric characteristics of extremely low losses materials like single- and poly-crystalline diamond. Their extremely high-quality factors allow for a substantial increase in resolution in the determination of these parameters when compared to state-of-the-art Fabry Perot open resonators. We hereby report the simulation study that lead to the final design of the devices and the first characterization measurements performed on a prototype resonator patterned on a single crystalline diamond substrate.