Bound States-to-Bands in the Continuum in Cylindrical Granular Crystals
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910658284486656 |
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| author | Jang, Yeongtae Kim, Seokwoo Lee, Dongwoo Kim, Eunho Rrho, Junsuk |
| author_facet | Jang, Yeongtae Kim, Seokwoo Lee, Dongwoo Kim, Eunho Rrho, Junsuk |
| contents | We theoretically investigate and experimentally demonstrate that genuine bound states in the continuum (BICs) -- polarization-protected BICs -- can be completely localized within finite-size solid resonators. This bound mode is realized in a highly tunable mechanical system made of cylindrical granular crystals, where tunning the contact boundaries enables the in situ transition from the BICs to quasi-BICs in a controllable manner. Since a single-particle resonator can support BICs itself, these bound states can extend to form bound bands within periodic structures composed of such resonators. We experimentally demonstrate the emergence of a quasi-bound (flat) band in a finite chain with broken resonator symmetry, using a laser Doppler vibrometer. Remarkably, we show that all cylindrical resonators within the entire chain exhibit high-Q and dispersionless resonance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_16209 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bound States-to-Bands in the Continuum in Cylindrical Granular Crystals Jang, Yeongtae Kim, Seokwoo Lee, Dongwoo Kim, Eunho Rrho, Junsuk Applied Physics Other Condensed Matter We theoretically investigate and experimentally demonstrate that genuine bound states in the continuum (BICs) -- polarization-protected BICs -- can be completely localized within finite-size solid resonators. This bound mode is realized in a highly tunable mechanical system made of cylindrical granular crystals, where tunning the contact boundaries enables the in situ transition from the BICs to quasi-BICs in a controllable manner. Since a single-particle resonator can support BICs itself, these bound states can extend to form bound bands within periodic structures composed of such resonators. We experimentally demonstrate the emergence of a quasi-bound (flat) band in a finite chain with broken resonator symmetry, using a laser Doppler vibrometer. Remarkably, we show that all cylindrical resonators within the entire chain exhibit high-Q and dispersionless resonance. |
| title | Bound States-to-Bands in the Continuum in Cylindrical Granular Crystals |
| topic | Applied Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2410.16209 |