Details
| Original language | English |
|---|---|
| Article number | 117710 |
| Journal | Journal of sound and vibration |
| Volume | 555 |
| Early online date | 6 Apr 2023 |
| Publication status | Published - 7 Jul 2023 |
Abstract
Non-Hermitian systems that possess loss and gain have been receiving a great deal of interest in various wave problems demonstrating diverse unprecedented wave phenomena. Here, we theoretically and numerically investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain based on shunted piezoelectric layers. We present the coherent perfect absorption and lasing effects (CPAL) for flexural waves occurring in the PT broken phase via designing the circuit parameters and discuss their physical mechanisms. Moreover, we focus on the exceptional points (EP) behaving as thresholds of phase transitions and realize unidirectional reflectionless for incident waves from different directions by adjusting the circuit parameters. We further employ EP to realize unidirectional cloakings. Finally, we contrastively study the origins and sensitivities of the non-Hermitian EP and the Hermitian diabolic point (DP) for elastic waves. Our study explores complex material parameters of elastic plates and offers a reliable platform for designing the non-Hermitian elastic wave phenomena, paving the way for highly sensitive sensors, asymmetric wave control, wave absorption and amplification, and energy harvesting.
Keywords
- Coherent perfect absorption and lasing effects, Exceptional points, Non-hermitian, Parity-time symmetry, Piezoelectric materials
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Physics and Astronomy(all)
- Acoustics and Ultrasonics
- Engineering(all)
- Mechanical Engineering
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In: Journal of sound and vibration, Vol. 555, 117710, 07.07.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates
AU - Cai, Runcheng
AU - Jin, Yabin
AU - Li, Yong
AU - Zhu, Jie
AU - Zhu, Hehua
AU - Rabczuk, Timon
AU - Zhuang, Xiaoying
N1 - Funding Information: This work is supported by the National Natural Science Foundation of China ( 12272267 , 52278411 , 11902223 ), the Young Elite Scientists Sponsorship Program by CAST ( 2021QNRC001 ), the Shanghai Science and Technology Committee (Grant Nos. 22JC1404100 , 21JC1405600 ), the program for the professor of special appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the Fundamental Research Funds for the Central Universities.
PY - 2023/7/7
Y1 - 2023/7/7
N2 - Non-Hermitian systems that possess loss and gain have been receiving a great deal of interest in various wave problems demonstrating diverse unprecedented wave phenomena. Here, we theoretically and numerically investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain based on shunted piezoelectric layers. We present the coherent perfect absorption and lasing effects (CPAL) for flexural waves occurring in the PT broken phase via designing the circuit parameters and discuss their physical mechanisms. Moreover, we focus on the exceptional points (EP) behaving as thresholds of phase transitions and realize unidirectional reflectionless for incident waves from different directions by adjusting the circuit parameters. We further employ EP to realize unidirectional cloakings. Finally, we contrastively study the origins and sensitivities of the non-Hermitian EP and the Hermitian diabolic point (DP) for elastic waves. Our study explores complex material parameters of elastic plates and offers a reliable platform for designing the non-Hermitian elastic wave phenomena, paving the way for highly sensitive sensors, asymmetric wave control, wave absorption and amplification, and energy harvesting.
AB - Non-Hermitian systems that possess loss and gain have been receiving a great deal of interest in various wave problems demonstrating diverse unprecedented wave phenomena. Here, we theoretically and numerically investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain based on shunted piezoelectric layers. We present the coherent perfect absorption and lasing effects (CPAL) for flexural waves occurring in the PT broken phase via designing the circuit parameters and discuss their physical mechanisms. Moreover, we focus on the exceptional points (EP) behaving as thresholds of phase transitions and realize unidirectional reflectionless for incident waves from different directions by adjusting the circuit parameters. We further employ EP to realize unidirectional cloakings. Finally, we contrastively study the origins and sensitivities of the non-Hermitian EP and the Hermitian diabolic point (DP) for elastic waves. Our study explores complex material parameters of elastic plates and offers a reliable platform for designing the non-Hermitian elastic wave phenomena, paving the way for highly sensitive sensors, asymmetric wave control, wave absorption and amplification, and energy harvesting.
KW - Coherent perfect absorption and lasing effects
KW - Exceptional points
KW - Non-hermitian
KW - Parity-time symmetry
KW - Piezoelectric materials
UR - http://www.scopus.com/inward/record.url?scp=85152142702&partnerID=8YFLogxK
U2 - 10.1016/j.jsv.2023.117710
DO - 10.1016/j.jsv.2023.117710
M3 - Article
AN - SCOPUS:85152142702
VL - 555
JO - Journal of sound and vibration
JF - Journal of sound and vibration
SN - 0022-460X
M1 - 117710
ER -