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Acoustic multiple transmission peaks in Thue-Morse structures based on lateral resonators
Zaky A Zaky1,2, Ali Hennache3, Ilyas Antraoui4
1Physics Department, Faculty of Science, TH-PPM Group, Beni-Suef University, Beni Suef, 62514, Egypt. zaky.a.zaky@science.bsu.edu.eg.
Scientific Reports
|December 4, 2025
Summary
This study explores acoustic wave propagation in quasi-periodic waveguides using Thue-Morse sequences. The novel design creates tunable band gaps for enhanced noise control and gas detection sensitivity.
Area of Science:
- Acoustics
- Materials Science
- Wave Propagation
Background:
- Quasi-periodic structures offer unique wave manipulation properties.
- Thue-Morse sequences provide a framework for designing complex aperiodic systems.
- Resonator-based waveguides are crucial for acoustic filtering and sensing.
Purpose of the Study:
- To investigate acoustic wave propagation in 1D quasi-periodic waveguides.
- To explore the acoustic band gap properties and noise attenuation capabilities.
- To assess the potential for acoustic multiplexing and high-sensitivity gas detection.
Main Methods:
- Utilized transfer matrix and finite element methods for acoustic transmittance calculations.
- Designed waveguide structures with two distinct resonator blocks.
- Analyzed the impact of Thue-Morse sequence parameters and structural modifications.
Main Results:
- Observed low-frequency band gaps due to local resonance effects in quasi-periodic structures.
- Demonstrated significant broadening of the central band gap with increased cross-section ratio, enhancing noise attenuation.
- Generated controllable sharp resonance peaks within band gaps and identified high sensitivity for gas detection (17.2 Hz·s/m).
Conclusions:
- Quasi-periodic Thue-Morse waveguide designs enable effective control over acoustic band gaps and transmittance.
- The structures show promise for advanced acoustic multiplexing devices and highly sensitive gas sensors.
- Structural parameters and sequence modifications offer tunable acoustic properties for tailored applications.
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