Imaging transverse modes in a GHz surface acoustic wave cavity
Fuente:
arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866909293015465984 |
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| author | Fisicaro, M. Steenbergen, T. A. Doedes, Y. C. Heeck, K. Löffler, W. |
| author_facet | Fisicaro, M. Steenbergen, T. A. Doedes, Y. C. Heeck, K. Löffler, W. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_11630 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Imaging transverse modes in a GHz surface acoustic wave cavity Fisicaro, M. Steenbergen, T. A. Doedes, Y. C. Heeck, K. Löffler, W. Optics Applied Physics Quantum Physics 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. |
| title | Imaging transverse modes in a GHz surface acoustic wave cavity |
| topic | Optics Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2408.11630 |