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Slow acoustic surface modes through the use of hidden geometry
S R Shelley1, J G Beadle1, A P Hibbins1
1Electromagnetic and Acoustic Materials Group, University of Exeter, Exeter, EX4 4QL, UK.
Scientific Reports
|November 11, 2021
Summary
Researchers investigated acoustic surface modes in partly covered meander grooves. Tuning the uncovered section allows control over acoustic surface wave speeds and dispersion, enabling slower waves and tunable band gaps.
Area of Science:
- Acoustics
- Surface Physics
- Materials Science
Background:
- Periodic structures are crucial for manipulating acoustic waves.
- Meander groove structures offer unique acoustic properties.
- Controlling acoustic surface wave (ASW) speed is vital for device applications.
Purpose of the Study:
- To investigate acoustic surface modes in a partly covered periodic meander groove structure.
- To explore the tunability of ASW speeds and dispersion characteristics.
- To understand the impact of the uncovered section's position on band gap formation.
Main Methods:
- Theoretical investigation of acoustic surface modes.
- Analysis of a periodic meander groove structure on a rigid plate.
- Modeling the effect of varying the size and position of the uncovered section.
Main Results:
- A partly covered meander structure supports slower ASWs compared to an uncovered one.
- Phase and group speeds of ASWs are tunable by adjusting the uncovered section size.
- Centered uncovered sections lead to linear dispersion without a band gap at the Brillouin zone boundary due to glide symmetry.
- Displacement of the uncovered section opens a band gap at the Brillouin zone boundary.
Conclusions:
- Partly covering periodic meander grooves offers a method to tune ASW properties.
- The position of the uncovered section is critical for controlling dispersion and band gap formation.
- This tunable ASW behavior has potential applications in acoustic devices.
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