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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Mechanical metamaterials with negative compressibility transitions.

Zachary G Nicolaou¹, Adilson E Motter

¹Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA.

Nature Materials

|May 22, 2012

Summary

Researchers designed novel metamaterials that contract when stretched, a phenomenon called negative compressibility. This counterintuitive behavior, achieved through destabilizing constituent equilibria, has potential applications in actuators and protective devices.

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Area of Science:

Materials Science
Metamaterials
Network Theory

Background:

Ordinary materials expand under tension.
Negative compressibility, where materials contract under tension, is an unusual property.
Achieving negative compressibility is challenging due to inherent material instabilities.

Purpose of the Study:

To explore network concepts for designing metamaterials with negative compressibility transitions.
To demonstrate a method for achieving continuous contraction under tension.
To investigate the underlying mechanisms and potential applications of these metamaterials.

Main Methods:

Utilizing network concepts to design metamaterial structures.
Inducing destabilizations of constituent equilibria to trigger phase transitions.
Analyzing stress-strain relationships and hysteresis curves.

Main Results:

Demonstrated metamaterials exhibiting negative compressibility transitions.
Observed a stress-induced solid-solid phase transition.
Characterized a twisted hysteresis curve in the stress-strain relationship.
Identified a force amplification phenomenon as the strain-driven counterpart.

Conclusions:

Metamaterials can be designed to exhibit negative compressibility through controlled destabilizations.
The proposed materials offer potential for advanced applications.
These findings open new avenues for designing materials with tailored mechanical responses.