Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak
Invisibility or unhearability cloaks have been made possible by using metamaterials enabling light or sound to flow around obstacle without the trace of reflections or shadows. Metamaterials are known for being flexible building units that can mimic a host of unusual and extreme material responses,...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Association for the Advancement of Science (AAAS)
2019-01-01
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| Series: | Research |
| Online Access: | http://dx.doi.org/10.34133/2019/8345683 |
| _version_ | 1827333581716848640 |
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| author | Hao-xiang Li María Rosendo-López Yi-fan Zhu Xu-dong Fan Daniel Torrent Bin Liang Jian-chun Cheng Johan Christensen |
| author_facet | Hao-xiang Li María Rosendo-López Yi-fan Zhu Xu-dong Fan Daniel Torrent Bin Liang Jian-chun Cheng Johan Christensen |
| author_sort | Hao-xiang Li |
| collection | DOAJ |
| description | Invisibility or unhearability cloaks have been made possible by using metamaterials enabling light or sound to flow around obstacle without the trace of reflections or shadows. Metamaterials are known for being flexible building units that can mimic a host of unusual and extreme material responses, which are essential when engineering artificial material properties to realize a coordinate transforming cloak. Bending and stretching the coordinate grid in space require stringent material parameters; therefore, small inaccuracies and inevitable material losses become sources for unwanted scattering that are decremental to the desired effect. These obstacles further limit the possibility of achieving a robust concealment of sizeable objects from either radar or sonar detection. By using an elaborate arrangement of gain and lossy acoustic media respecting parity-time symmetry, we built a one-way unhearability cloak able to hide objects seven times larger than the acoustic wavelength. Generally speaking, our approach has no limits in terms of working frequency, shape, or size, specifically though we demonstrate how, in principle, an object of the size of a human can be hidden from audible sound. |
| first_indexed | 2024-03-07T17:28:31Z |
| format | Article |
| id | doaj.art-c78a31549c49463b9fbf3ac6d2da9d86 |
| institution | Directory Open Access Journal |
| issn | 2639-5274 |
| language | English |
| last_indexed | 2024-03-07T17:28:31Z |
| publishDate | 2019-01-01 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | Article |
| series | Research |
| spelling | doaj.art-c78a31549c49463b9fbf3ac6d2da9d862024-03-02T18:34:44ZengAmerican Association for the Advancement of Science (AAAS)Research2639-52742019-01-01201910.34133/2019/8345683Ultrathin Acoustic Parity-Time Symmetric Metasurface CloakHao-xiang Li0María Rosendo-López1Yi-fan Zhu2Xu-dong Fan3Daniel Torrent4Bin Liang5Jian-chun Cheng6Johan Christensen7Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Physics, Universidad Carlos III de Madrid, 28916 Leganés, Madrid, SpainKey Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaGROC, UJI, Institut de Noves Tecnologies de la Imatge (INIT), Universitat Jaume I, 12080 Castellè, SpainKey Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Physics, Universidad Carlos III de Madrid, 28916 Leganés, Madrid, SpainInvisibility or unhearability cloaks have been made possible by using metamaterials enabling light or sound to flow around obstacle without the trace of reflections or shadows. Metamaterials are known for being flexible building units that can mimic a host of unusual and extreme material responses, which are essential when engineering artificial material properties to realize a coordinate transforming cloak. Bending and stretching the coordinate grid in space require stringent material parameters; therefore, small inaccuracies and inevitable material losses become sources for unwanted scattering that are decremental to the desired effect. These obstacles further limit the possibility of achieving a robust concealment of sizeable objects from either radar or sonar detection. By using an elaborate arrangement of gain and lossy acoustic media respecting parity-time symmetry, we built a one-way unhearability cloak able to hide objects seven times larger than the acoustic wavelength. Generally speaking, our approach has no limits in terms of working frequency, shape, or size, specifically though we demonstrate how, in principle, an object of the size of a human can be hidden from audible sound.http://dx.doi.org/10.34133/2019/8345683 |
| spellingShingle | Hao-xiang Li María Rosendo-López Yi-fan Zhu Xu-dong Fan Daniel Torrent Bin Liang Jian-chun Cheng Johan Christensen Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak Research |
| title | Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak |
| title_full | Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak |
| title_fullStr | Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak |
| title_full_unstemmed | Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak |
| title_short | Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak |
| title_sort | ultrathin acoustic parity time symmetric metasurface cloak |
| url | http://dx.doi.org/10.34133/2019/8345683 |
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