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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

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Coupled membranes with doubly negative mass density and bulk modulus.

Min Yang¹, Guancong Ma, Zhiyu Yang

¹Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Physical Review Letters

|April 16, 2013

Summary

We developed a simple acoustic metamaterial using coupled membranes that achieves broadband double negativity. This breakthrough enables tunable monopolar and dipolar resonances for advanced acoustic applications.

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Area of Science:

Acoustics
Materials Science
Metamaterials

Background:

Acoustic metamaterials offer unique wave manipulation properties.
Achieving double negative properties (simultaneously negative effective mass density and bulk modulus) is crucial for advanced acoustic devices.
Existing designs often face limitations in bandwidth and structural simplicity.

Purpose of the Study:

To present a novel, structurally simple acoustic double negative metamaterial.
To demonstrate broadband double negativity through tunable resonances.
To validate a homogenization scheme for characterizing the metamaterial's effective properties.

Main Methods:

Utilizing two coupled membranes to create the acoustic metamaterial.
Employing symmetry to generate and separately tune monopolar and dipolar resonances.
Implementing a homogenization scheme using measured displacement fields for exact characterization.
Conducting transmission and reflection experiments to validate predictions.

Main Results:

Achieved double negativity in the frequency range of 520-830 Hz.
Demonstrated that the coupled membrane system allows for broadband double negativity.
Showed excellent agreement between experimental results and predictions based on effective parameters.

Conclusions:

The presented coupled membrane system is a structurally and conceptually simple route to broadband acoustic double negativity.
The developed homogenization scheme accurately characterizes the metamaterial beyond the long-wavelength limit.
This work paves the way for practical applications of acoustic double negative metamaterials.