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 -