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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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Parity-Time Synthetic Phononic Media.

J Christensen¹, M Willatzen¹, V R Velasco²

¹Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.

Physical Review Letters

|June 4, 2016

Summary

This summary is machine-generated.

Researchers created synthetic acoustic materials using piezoelectric semiconductors to mimic non-Hermitian properties. This breakthrough enables unidirectional suppressed reflectance, a key feature for advanced acoustic applications like sonar evasion.

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Area of Science:

Acoustics and Materials Science
Non-Hermitian Physics
Condensed Matter Physics

Background:

Classical systems can mimic non-Hermitian properties, typically found in quantum mechanics.
Parity-time (PT) symmetric media, or synthetic media, have been demonstrated in optics for applications like invisibility cloaks.
Achieving PT symmetry in acoustics is challenging due to the difficulty of controlling wave propagation with both loss and gain.

Purpose of the Study:

To demonstrate a feasible approach for creating phononic PT synthetic media using sound waves.
To investigate the tunability of wave attenuation and amplification in synthetic acoustic materials.
To achieve unidirectional suppressed reflectance for potential applications in acoustics.

Main Methods:

Utilizing electrically biased piezoelectric semiconductors to achieve controlled loss and gain elements.
Investigating the acoustic wave propagation through these synthetic media.
Analyzing the reflectance properties to demonstrate unidirectional suppression.

Main Results:

Demonstrated tunable wave attenuation and amplification in piezoelectric semiconductors.
Successfully created a phononic PT synthetic medium.
Observed unidirectional suppressed reflectance, a novel acoustic property.

Conclusions:

Electrically biased piezoelectric semiconductors offer a viable route to engineer synthetic acoustic materials with PT symmetry.
The demonstrated unidirectional suppressed reflectance has direct applications in advanced acoustic technologies, such as evading sonar detection.
This work opens new avenues for designing complex acoustic devices with tailored wave manipulation capabilities.