Continuous-wave amplitude control via the interference phenomenon in acoustic structures
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866910643723960320 |
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| author | Liu, Bingyi Liu, Shanshan Li, Liulin Bi, Chuanxing Guo, Kai Li, Yong Guo, Zhongyi |
| author_facet | Liu, Bingyi Liu, Shanshan Li, Liulin Bi, Chuanxing Guo, Kai Li, Yong Guo, Zhongyi |
| contents | We propose a strategy to continuously tune the amplitude of acoustic waves based on the interference among two mode-conversion paths in passive acoustic structures. The interference phenomenon is attributed to two conjugate acoustic geometric phases obtained with two mode-conversion processes in hybrid-type geometric-phase meta-atom (HGPM) pair. Notably, 100% modulation depth of the wave amplitude is achievable by simply varying the local orientation angle of meta-atom. We utilize the acoustic structure made of two cylindrical resonators to construct deep-subwavelength secondary source with designated initial phase delay, and HGPM supporting desired mode-conversion functionality is accordingly fabricated with four secondary sources. Both theory and experiment consistently verify the continuous amplitude modulation function of HGPM pair, which showcases a general scheme for reconfigurable amplitude-type acoustic meta-devices, i.e., those that require grayscale amplitude modulation for acoustic field engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_07529 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Continuous-wave amplitude control via the interference phenomenon in acoustic structures Liu, Bingyi Liu, Shanshan Li, Liulin Bi, Chuanxing Guo, Kai Li, Yong Guo, Zhongyi Applied Physics We propose a strategy to continuously tune the amplitude of acoustic waves based on the interference among two mode-conversion paths in passive acoustic structures. The interference phenomenon is attributed to two conjugate acoustic geometric phases obtained with two mode-conversion processes in hybrid-type geometric-phase meta-atom (HGPM) pair. Notably, 100% modulation depth of the wave amplitude is achievable by simply varying the local orientation angle of meta-atom. We utilize the acoustic structure made of two cylindrical resonators to construct deep-subwavelength secondary source with designated initial phase delay, and HGPM supporting desired mode-conversion functionality is accordingly fabricated with four secondary sources. Both theory and experiment consistently verify the continuous amplitude modulation function of HGPM pair, which showcases a general scheme for reconfigurable amplitude-type acoustic meta-devices, i.e., those that require grayscale amplitude modulation for acoustic field engineering. |
| title | Continuous-wave amplitude control via the interference phenomenon in acoustic structures |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2410.07529 |