Imaging transverse modes in a GHz surface acoustic wave cavity

• URL: http://arxiv.org/abs/2408.11630v1
• Date: Wed, 21 Aug 2024 14:01:17 GMT
• Title: Imaging transverse modes in a GHz surface acoustic wave cavity
• Authors: M. Fisicaro, T. A. Steenbergen, Y. C. Doedes, K. Heeck, W. Löffler,
• Abstract summary: Full characterization of surface acoustic wave (SAW) devices requires imaging the spatial distribution of the acoustic field. We present a fiber-based scanning Michelson interferometer employing a strongly focused laser beam as a probe.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Full characterization of surface acoustic wave (SAW) devices requires imaging the spatial distribution of the acoustic field, which is not possible with standard all-electrical measurements where an interdigital transducer (IDT) is used as a detector. Here we present a fiber-based scanning Michelson interferometer employing a strongly focused laser beam as a probe. Combined with a heterodyne circuit, this setup enables frequency- and spatially-resolved measurements of the amplitude and phase of the SAW displacement. We demonstrate this by investigating a 1 GHz SAW cavity, revealing the presence of frequency-overlapping transverse modes, which are not resolved with an all-electrical measurement. The frequency overlap of these transverse modes leads to mode superpositions, which we analyze by quadrature decomposition of the complex acoustic field.

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