A nonreciprocal and tunable active acoustic scatterer
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916518660407296 |
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| author | Maddi, Anis Poignand, Gaelle Achilleos, Vassos Pagneux, Vincent Penelet, Guillaume |
| author_facet | Maddi, Anis Poignand, Gaelle Achilleos, Vassos Pagneux, Vincent Penelet, Guillaume |
| contents | A passive loudspeaker mounted in a duct acts as a reciprocal scatterer for plane waves impinging on either of its sides. However, the reciprocity can be broken by means of an asymmetric electroacoustic feedback which supplies to the loudspeaker a signal picked-up from a microphone facing only one of its sides. This simple modification offers new opportunities for the control and manipulation of sound waves. In this paper, we investigate the scattering features of a pair of such actively controlled loudspeakers connected by means of a short and narrow duct. The theoretical and experimental results demonstrate that by tuning the feedback loops, the system exhibits several exotic effects, which include an asymmetric reflectionless configuration with one-way transmission or absorption, a directional amplifier with an isolation of 42 dB, and a quasi CPA-lasing configuration. All of these effects were achieved using a single setup in the subwavelength regime, highlighting the versatility of such an asymmetrically active scatterer. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_08409 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A nonreciprocal and tunable active acoustic scatterer Maddi, Anis Poignand, Gaelle Achilleos, Vassos Pagneux, Vincent Penelet, Guillaume Applied Physics A passive loudspeaker mounted in a duct acts as a reciprocal scatterer for plane waves impinging on either of its sides. However, the reciprocity can be broken by means of an asymmetric electroacoustic feedback which supplies to the loudspeaker a signal picked-up from a microphone facing only one of its sides. This simple modification offers new opportunities for the control and manipulation of sound waves. In this paper, we investigate the scattering features of a pair of such actively controlled loudspeakers connected by means of a short and narrow duct. The theoretical and experimental results demonstrate that by tuning the feedback loops, the system exhibits several exotic effects, which include an asymmetric reflectionless configuration with one-way transmission or absorption, a directional amplifier with an isolation of 42 dB, and a quasi CPA-lasing configuration. All of these effects were achieved using a single setup in the subwavelength regime, highlighting the versatility of such an asymmetrically active scatterer. |
| title | A nonreciprocal and tunable active acoustic scatterer |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2412.08409 |