Coupled resonators based on high permittivity dielectrics for microwave sensors

• URL: http://arxiv.org/abs/2410.05831v1
• Date: Tue, 8 Oct 2024 08:57:40 GMT
• Title: Coupled resonators based on high permittivity dielectrics for microwave sensors
• Authors: Shahnam Gorgi Zadeh, Alberto Ghirri, Sergio Pagano, Simone Tocci, Claudio Gatti, Antonio Cassinese,
• Abstract summary: We report on a coupled cavity configuration in which a superconducting cavity is coupled with a high permittivity resonator. The sensitivities of such configurations are discussed both in strong coupling and weak coupling regime. These results highlight the potential of the coupled resonator systems as microwave sensors and are useful for the engineering of high permittivity resonators for applications at cryogenic temperatures.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: The use of coupled cavities with high quality factor is of undoubted interest for several applications including those concerning quantum sensing and metrology. Here we report on a coupled cavity configuration in which a high $Q$-factor elliptical TESLA-shaped superconducting cavity is coupled with a high permittivity ($\varepsilon_\mathrm{r}$) dielectric resonator. We carried out first tests using a SrTiO$_3$ (STO) resonator at 0.1 GHz, whose permittivity has been observed to reach values higher than 30000 a 0.16 K. The sensitivities of such configurations are discussed both in strong coupling and weak coupling regime. In particular we show that the notch of the coupled system has, as a function of the permittivity, a frequency sensitivity of 2.8 MHz for $\varepsilon_\mathrm{r} \approx 230$. These results highlight the potential of the coupled resonator systems as microwave sensors and are useful for the engineering of high permittivity resonators for applications at cryogenic temperatures.

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