Merging mechanical bound states in the continuum in high-aspect-ratio phononic crystal gratings
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| Format: | Preprint |
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2023
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| _version_ | 1866916299057135616 |
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| author | Tong, Hao Liu, Shengyan Fang, Kejie |
| author_facet | Tong, Hao Liu, Shengyan Fang, Kejie |
| contents | Mechanical bound states in the continuum (BICs) present an alternative avenue for developing high-frequency, high-Q mechanical resonators, distinct from the conventional band structure engineering method. While symmetry-protected mechanical BICs have been realized in phononic crystals, the observation of accidental mechanical BICs -- whose existence is independent of mode symmetry and tunable by structural parameters -- has remained elusive. This challenge is primarily attributed to the additional radiation channel introduced by the longitudinal component of elastic waves. Here, we employ a coupled wave theory to predict and experimentally demonstrate mechanical accidental BICs within a high-aspect-ratio gallium arsenide phononic crystal grating. We observe the merging process of accidental BICs with symmetry-protected BICs, resulting in reduced acoustic radiation losses compared to isolated BICs. This finding opens up new possibilities for phonon trapping using BIC-based systems, with potential applications in sensing, transduction, and quantum measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_12704 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Merging mechanical bound states in the continuum in high-aspect-ratio phononic crystal gratings Tong, Hao Liu, Shengyan Fang, Kejie Applied Physics Mechanical bound states in the continuum (BICs) present an alternative avenue for developing high-frequency, high-Q mechanical resonators, distinct from the conventional band structure engineering method. While symmetry-protected mechanical BICs have been realized in phononic crystals, the observation of accidental mechanical BICs -- whose existence is independent of mode symmetry and tunable by structural parameters -- has remained elusive. This challenge is primarily attributed to the additional radiation channel introduced by the longitudinal component of elastic waves. Here, we employ a coupled wave theory to predict and experimentally demonstrate mechanical accidental BICs within a high-aspect-ratio gallium arsenide phononic crystal grating. We observe the merging process of accidental BICs with symmetry-protected BICs, resulting in reduced acoustic radiation losses compared to isolated BICs. This finding opens up new possibilities for phonon trapping using BIC-based systems, with potential applications in sensing, transduction, and quantum measurements. |
| title | Merging mechanical bound states in the continuum in high-aspect-ratio phononic crystal gratings |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2312.12704 |