Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials
Acoustic purely imaginary metamaterials (PIMs) contain loss and gain uniformly distributed in space, but in different parameters. Therefore, the PIMs contain the elements of gain and loss simultaneously. As a result, some extraordinary wave modes may appear depending on whether gain or loss elements...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/12/5962 |
| _version_ | 1797490319398273024 |
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| author | Ling-Ling Zhang Xiao-Jun Liu |
| author_facet | Ling-Ling Zhang Xiao-Jun Liu |
| author_sort | Ling-Ling Zhang |
| collection | DOAJ |
| description | Acoustic purely imaginary metamaterials (PIMs) contain loss and gain uniformly distributed in space, but in different parameters. Therefore, the PIMs contain the elements of gain and loss simultaneously. As a result, some extraordinary wave modes may appear depending on whether gain or loss elements dominate. In this work, we theoretically and numerically investigate the general excitation conditions for acoustic lasing, coherent perfect absorption (CPA) and for their co-existence in the framework of acoustic PIMs. All-angle negative refraction and planar focusing are achieved by pairing two PIM slabs with conjugating parameters. The proposed structure provides an alternative basis for possible applications of acoustic perfect imaging. |
| first_indexed | 2024-03-10T00:31:19Z |
| format | Article |
| id | doaj.art-2dd64d71832541b8ae0266b9c79fa988 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T00:31:19Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-2dd64d71832541b8ae0266b9c79fa9882023-11-23T15:25:23ZengMDPI AGApplied Sciences2076-34172022-06-011212596210.3390/app12125962Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary MetamaterialsLing-Ling Zhang0Xiao-Jun Liu1School of Network and Communication Engineering, Jingling Institute of Technology, Nanjing 211169, ChinaKey Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaAcoustic purely imaginary metamaterials (PIMs) contain loss and gain uniformly distributed in space, but in different parameters. Therefore, the PIMs contain the elements of gain and loss simultaneously. As a result, some extraordinary wave modes may appear depending on whether gain or loss elements dominate. In this work, we theoretically and numerically investigate the general excitation conditions for acoustic lasing, coherent perfect absorption (CPA) and for their co-existence in the framework of acoustic PIMs. All-angle negative refraction and planar focusing are achieved by pairing two PIM slabs with conjugating parameters. The proposed structure provides an alternative basis for possible applications of acoustic perfect imaging.https://www.mdpi.com/2076-3417/12/12/5962purely imaginary metamaterialsacoustic equivalent lasingcoherent perfect absorptionnegative refractionplanar focusing |
| spellingShingle | Ling-Ling Zhang Xiao-Jun Liu Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials Applied Sciences purely imaginary metamaterials acoustic equivalent lasing coherent perfect absorption negative refraction planar focusing |
| title | Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials |
| title_full | Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials |
| title_fullStr | Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials |
| title_full_unstemmed | Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials |
| title_short | Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials |
| title_sort | acoustic negative refraction and planar focusing based on purely imaginary metamaterials |
| topic | purely imaginary metamaterials acoustic equivalent lasing coherent perfect absorption negative refraction planar focusing |
| url | https://www.mdpi.com/2076-3417/12/12/5962 |
| work_keys_str_mv | AT linglingzhang acousticnegativerefractionandplanarfocusingbasedonpurelyimaginarymetamaterials AT xiaojunliu acousticnegativerefractionandplanarfocusingbasedonpurelyimaginarymetamaterials |