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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.05815 |
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| _version_ | 1866917191975174144 |
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| author | Shokati, Elnaz Thomas, Robert Balram, Krishna C. |
| author_facet | Shokati, Elnaz Thomas, Robert Balram, Krishna C. |
| contents | Film bulk acoustic wave resonators (FBARs) underpin modern wireless communication by enabling compact, high-performance RF filters in modern smartphones. Traditionally, these FBAR devices work with quasi-plane waves of sound where the transverse extent of the acoustic field $\gg$ the acoustic wavelength ($λ_a$). On the other hand, strong modal confinement is needed for achieving the interaction strengths necessary for building efficient microwave to optical quantum photon transducers (MW-OT) around an FBAR opto-mechanical cavity platform. Here, we fabricate a small mode-volume phonon trapping lateral field excited FBAR resonator (XBAR) by shaping the piezoelectric layer into a spherical lens, show an improvement in modal confinement and quality factor ($\approx$ 4$\times$), and discuss the improvements needed for building efficient MW-OTs around this XBAR geometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_05815 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Phonon Trapping Lateral Field Excited Suspended Bulk Acoustic Wave Resonators (XBARs) Shokati, Elnaz Thomas, Robert Balram, Krishna C. Optics Applied Physics Film bulk acoustic wave resonators (FBARs) underpin modern wireless communication by enabling compact, high-performance RF filters in modern smartphones. Traditionally, these FBAR devices work with quasi-plane waves of sound where the transverse extent of the acoustic field $\gg$ the acoustic wavelength ($λ_a$). On the other hand, strong modal confinement is needed for achieving the interaction strengths necessary for building efficient microwave to optical quantum photon transducers (MW-OT) around an FBAR opto-mechanical cavity platform. Here, we fabricate a small mode-volume phonon trapping lateral field excited FBAR resonator (XBAR) by shaping the piezoelectric layer into a spherical lens, show an improvement in modal confinement and quality factor ($\approx$ 4$\times$), and discuss the improvements needed for building efficient MW-OTs around this XBAR geometry. |
| title | Phonon Trapping Lateral Field Excited Suspended Bulk Acoustic Wave Resonators (XBARs) |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2601.05815 |