Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Runcheng Cai
  • Yabin Jin
  • Yong Li
  • Jie Zhu
  • Hehua Zhu
  • Timon Rabczuk
  • Xiaoying Zhuang

Research Organisations

External Research Organisations

  • Tongji University
  • Bauhaus-Universität Weimar
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Details

Original languageEnglish
Article number117710
JournalJournal of sound and vibration
Volume555
Early online date6 Apr 2023
Publication statusPublished - 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

Cite this

Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates. / Cai, Runcheng; Jin, Yabin; Li, Yong et al.
In: Journal of sound and vibration, Vol. 555, 117710, 07.07.2023.

Research output: Contribution to journalArticleResearchpeer review

Cai, R., Jin, Y., Li, Y., Zhu, J., Zhu, H., Rabczuk, T., & Zhuang, X. (2023). Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates. Journal of sound and vibration, 555, Article 117710. Advance online publication. https://doi.org/10.1016/j.jsv.2023.117710
Cai R, Jin Y, Li Y, Zhu J, Zhu H, Rabczuk T et al. Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates. Journal of sound and vibration. 2023 Jul 7;555:117710. Epub 2023 Apr 6. doi: 10.1016/j.jsv.2023.117710
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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.",
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AU - Jin, Yabin

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AU - Rabczuk, Timon

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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.

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