Dynamically reconfigurable metamaterials based devices with optical or acoustic wavelengths from ten microns to ten cm could have a wide range of applications. In optics it could lead to new beam deflectors or filters for terahertz imaging and in acoustics it might be possible to create acoustic barriers that can be optimised depending on the changing nature of the incident sound. Further applications in reconfigurable cloaks and lenses are also now conceivable.
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