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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Multilayer structures as negative refractive and left-handed materials.

S T Chui¹, C T Chan, Z F Lin

¹Bartol Research Institute, University of Delaware, Newark, DE 19716, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 24, 2011

Summary

Multilayer structures exhibit negative refraction over a wide range of incident angles for a specific polarization. This phenomenon arises from the anisotropic phase velocities, enabling applications in left-handed materials.

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Area of Science:

Physics
Materials Science
Electromagnetism

Background:

Negative refractive index materials and left-handed materials are of significant interest in electromagnetism.
Understanding the behavior of electromagnetic waves in anisotropic multilayer structures is crucial for developing novel optical and electronic devices.

Purpose of the Study:

To investigate the conditions under which multilayer structures exhibit negative refraction.
To explore the potential of these structures as left-handed materials.

Main Methods:

Analysis of electromagnetic wave propagation in multilayer structures.
Examination of the relationship between phase velocities, group velocity, and Poynting vector.
Consideration of material anisotropy and ferromagnetic properties.

Main Results:

A wide range of incident angles (approximately 90°) was found to support negative refraction for one polarization.
The observed behavior is attributed to the significant anisotropy of phase velocities in the multilayer structures.
The inclusion of a ferromagnetic metal allows the system to function as a left-handed material above the ferromagnetic resonance frequency.

Conclusions:

Multilayer structures can be engineered to exhibit negative refraction over a broad range of incident angles.
The anisotropic properties of these structures are key to achieving negative refraction.
Ferromagnetic multilayer systems offer a pathway to creating left-handed materials with tunable properties.