Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere
Acoustic conjugate metamaterials (ACMs), in which the imaginary parts of the effective complex mass density and bulk compressibility are cancelled out in the refractive index, possess the elements of loss and gain simultaneously. Previous works have focused on panel ACMs for plane wave incidence. In...
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MDPI AG
2022-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/4/1777 |
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| author | Xing-Xing Ma Qi Wei Xing-Feng Zhu Jie Yao Da-Jian Wu |
| author_facet | Xing-Xing Ma Qi Wei Xing-Feng Zhu Jie Yao Da-Jian Wu |
| author_sort | Xing-Xing Ma |
| collection | DOAJ |
| description | Acoustic conjugate metamaterials (ACMs), in which the imaginary parts of the effective complex mass density and bulk compressibility are cancelled out in the refractive index, possess the elements of loss and gain simultaneously. Previous works have focused on panel ACMs for plane wave incidence. In this paper, we explore the extraordinary scattering properties, including the acoustic equivalent lasing (AEL) and coherent perfect absorption (CPA) modes, of a three-dimensional ACM sphere, where incident spherical waves with specific topological orders could be extremely scattered and totally absorbed, respectively. Theoretical analysis and numerical simulations show that the AEL or CPA mode with a single order can be realized with a small monolayer ACM sphere with appropriate parameters. A huge (relative to incident wavelength) ACM sphere with pure imaginary parameters could support the even- (or odd-) order AEL and odd- (or even-) order CPA modes simultaneously. In addition, the AEL and/or CPA with multiple orders could be realized based on a small multilayered ACM sphere. The proposed ACM sphere may provide an alternative method to design acoustic functional devices, such as amplifiers and absorbers. |
| first_indexed | 2024-03-09T22:43:33Z |
| format | Article |
| id | doaj.art-7191be4b5b864a11a78aed9ef52bf8d3 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:43:33Z |
| publishDate | 2022-02-01 |
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| spelling | doaj.art-7191be4b5b864a11a78aed9ef52bf8d32023-11-23T18:33:58ZengMDPI AGApplied Sciences2076-34172022-02-01124177710.3390/app12041777Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial SphereXing-Xing Ma0Qi Wei1Xing-Feng Zhu2Jie Yao3Da-Jian Wu4Jiangsu Key Laboratory of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, ChinaJiangsu Key Laboratory of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, ChinaJiangsu Key Laboratory of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, ChinaJiangsu Key Laboratory of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, ChinaJiangsu Key Laboratory of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, ChinaAcoustic conjugate metamaterials (ACMs), in which the imaginary parts of the effective complex mass density and bulk compressibility are cancelled out in the refractive index, possess the elements of loss and gain simultaneously. Previous works have focused on panel ACMs for plane wave incidence. In this paper, we explore the extraordinary scattering properties, including the acoustic equivalent lasing (AEL) and coherent perfect absorption (CPA) modes, of a three-dimensional ACM sphere, where incident spherical waves with specific topological orders could be extremely scattered and totally absorbed, respectively. Theoretical analysis and numerical simulations show that the AEL or CPA mode with a single order can be realized with a small monolayer ACM sphere with appropriate parameters. A huge (relative to incident wavelength) ACM sphere with pure imaginary parameters could support the even- (or odd-) order AEL and odd- (or even-) order CPA modes simultaneously. In addition, the AEL and/or CPA with multiple orders could be realized based on a small multilayered ACM sphere. The proposed ACM sphere may provide an alternative method to design acoustic functional devices, such as amplifiers and absorbers.https://www.mdpi.com/2076-3417/12/4/1777acoustic conjugate metamaterialacoustic equivalent lasingcoherent perfect absorption |
| spellingShingle | Xing-Xing Ma Qi Wei Xing-Feng Zhu Jie Yao Da-Jian Wu Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere Applied Sciences acoustic conjugate metamaterial acoustic equivalent lasing coherent perfect absorption |
| title | Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere |
| title_full | Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere |
| title_fullStr | Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere |
| title_full_unstemmed | Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere |
| title_short | Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere |
| title_sort | acoustic equivalent lasing and coherent perfect absorption based on a conjugate metamaterial sphere |
| topic | acoustic conjugate metamaterial acoustic equivalent lasing coherent perfect absorption |
| url | https://www.mdpi.com/2076-3417/12/4/1777 |
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