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Related Experiment Video

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Tunable Two-Layer Dual-Band Metamaterial with Negative Modulus.

Limei Hao¹, Meiling Men², Yazhe Wang³

¹Department of Applied Physics, Xi'an University of Science and Technology, Xi'an 710054, China. haolm@xust.edu.cn.

Materials (Basel, Switzerland)

|October 5, 2019

Summary

This study presents a tunable dual-band acoustic metamaterial (AM) using nested spheres. Researchers precisely controlled its dual-band properties and negative modulus by adjusting structural parameters.

Keywords:

acoustic metamaterial dual-band two negative moduli two spring oscillators in series two-layer SHSs

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Area of Science:

Acoustics
Materials Science
Metamaterials

Background:

Acoustic metamaterials (AMs) offer unique wave manipulation capabilities.
Achieving tunable dual-band AMs with controllable negative modulus is crucial for advanced applications.

Purpose of the Study:

To design and investigate a tunable dual-band acoustic metamaterial (AM).
To explore the relationship between structural parameters and resonant frequencies.
To demonstrate the possibility of creating double-negative AMs.

Main Methods:

Theoretical analysis based on sound-force analogy (SFA) modeling TLSHSs as series spring oscillators.
Numerical simulations using the finite element method (FEM).
Derivation of analytical formulas for resonant frequencies.

Main Results:

A tunable dual-band AM with nested two-layer split hollow spheres (TLSHSs) was developed.
Two distinct resonant frequencies were identified and analytically derived.
The dynamic modulus exhibited negative values near resonant frequencies.
Resonant frequencies showed blue shifts with increased hole diameter and red shifts with increased volume ratio.

Conclusions:

The TLSHS structure provides precise control over dual-band AM properties.
The tunable negative modulus is achievable by adjusting hole diameter and volume ratio.
This AM can be integrated with negative mass density structures to achieve double-negative metamaterials.