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Composite medium with simultaneously negative permeability and permittivity

Smith¹, Padilla, Vier

¹Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0319, USA.

Physical Review Letters

|September 16, 2000

Summary

Researchers created a novel composite metamaterial exhibiting negative permeability and permittivity in the microwave range. This "left-handed" material opens possibilities for experimentally testing inverted physical phenomena.

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Angewandte Chemie (International ed. in English)·2000

Area of Science:

Condensed matter physics
Electromagnetism
Materials science

Background:

Metamaterials offer unique electromagnetic properties not found in natural materials.
Negative refractive index materials, or
left-handed
materials, have theoretical implications for wave propagation.

Purpose of the Study:

To design and demonstrate a composite metamaterial with simultaneously negative effective permeability and permittivity.
To create a platform for experimental verification of predicted phenomena in left-handed media.

Main Methods:

Fabrication of a composite medium using a periodic array of split ring resonators and continuous wires.
Microwave regime characterization of the material's electromagnetic response.

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Main Results:

The composite medium exhibited a frequency region with simultaneously negative effective permeability (µeff(ω)) and permittivity (εeff(ω)).
This demonstrates the creation of a left-handed metamaterial.

Conclusions:

The developed metamaterial enables experimental investigation of phenomena like the inverted Doppler effect, Cherenkov radiation, and Snell's law.
This work validates the practical realization of left-handed materials for microwave applications.