Energy confinement plays an important role in improving wave–matter interactions, enabling applications such as sensing, lasing, and filtering. One convenient solution for achieving large energy-confinement is based on embedded eigenstates, i.e., non-radiating eigenmodes supported by open structures. While the analysis of these modes is quite consolidated in electromagnetics and optics, their relevance in acoustics has been less explored, despite their wide application potential. In this work, we explore acoustic embedded scattering eigenstates within the radiation continuum enabled by resonant metasurface pairs. At resonance, each metasurface strongly reflects the input wave, but as their surface resonances interfere with each other through coupling with a longitudinal resonance, an embedded eigenstate emerges. Through both theoretical and numerical analysis, we show the conditions for such an exotic resonant state to emerge and its implication for acoustic systems.
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7 November 2022
Research Article|
November 10 2022
Acoustic embedded eigenstates in metasurface-based structures
Zahra Hamzavi Zarghani
;
Zahra Hamzavi Zarghani
a)
(Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Industrial, Electronic and Mechanical Engineering, “Roma Tre” University
, Via Vito Volterra 62, 00146 Rome, Italy
a)Author to whom correspondence should be addressed: zahra.hamzavizarghani@uniroma3.it
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Alessio Monti
;
Alessio Monti
(Formal analysis, Investigation, Methodology, Supervision, Writing – review & editing)
1
Department of Industrial, Electronic and Mechanical Engineering, “Roma Tre” University
, Via Vito Volterra 62, 00146 Rome, Italy
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Andrea Alù
;
Andrea Alù
(Conceptualization, Formal analysis, Methodology, Writing – review & editing)
2
Photonics Initiative, Advanced Science Research Center, City University of New York
, 85 St. Nicholas Terrace, New York, New York 10031, USA
3
Physics Program, Graduate Center, City University of New York
, New York, NY 10016, USA
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Filiberto Bilotti
;
Filiberto Bilotti
(Conceptualization, Formal analysis, Funding acquisition, Methodology, Supervision, Writing – review & editing)
1
Department of Industrial, Electronic and Mechanical Engineering, “Roma Tre” University
, Via Vito Volterra 62, 00146 Rome, Italy
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Alessandro Toscano
Alessandro Toscano
(Conceptualization, Funding acquisition, Methodology, Supervision, Writing – review & editing)
1
Department of Industrial, Electronic and Mechanical Engineering, “Roma Tre” University
, Via Vito Volterra 62, 00146 Rome, Italy
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a)Author to whom correspondence should be addressed: zahra.hamzavizarghani@uniroma3.it
Appl. Phys. Lett. 121, 192202 (2022)
Article history
Received:
July 26 2022
Accepted:
October 14 2022
Citation
Zahra Hamzavi Zarghani, Alessio Monti, Andrea Alù, Filiberto Bilotti, Alessandro Toscano; Acoustic embedded eigenstates in metasurface-based structures. Appl. Phys. Lett. 7 November 2022; 121 (19): 192202. https://doi.org/10.1063/5.0114885
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