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arXiv · 1804.03443

Microwave cavity tuned with liquid metal and its application to Electron Paramagnetic Resonance

C. S. Gallo·E. Berto·C. Braggio·F. Calaon·G. Carugno·N. Crescini·A. Ortolan·G. Ruoso·M. Tessaro
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Abstract

This note presents a method to tune the resonant frequency $f_{0}$ of a rectangular microwave cavity. This is achieved using a liquid metal, GaInSn, to decrease the volume of the cavity. It is possible to shift $f_{0}$ by filling the cavity with this alloy, in order to reduce the relative distance between the internal walls. The resulting modes have resonant frequencies in the range $7\div8\,$GHz. The capability of the system of producing an Electron Paramagnetic Resonance (EPR) measurement has been tested by placing a 1 mm diameter Yttrium Iron Garnet (YIG) sphere inside the cavity, and producing a strong coupling between the cavity resonance and Kittel mode. This work shows the possibility to tune a resonant system in the GHz range, which can be useful for several applications.

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C. S. Gallo, E. Berto, C. Braggio, F. Calaon, G. Carugno, N. Crescini, A. Ortolan, G. Ruoso, M. Tessaro. 2018-04-10. Microwave cavity tuned with liquid metal and its application to Electron Paramagnetic Resonance. https://arxiv.org/abs/1804.03443

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