Negative refraction in the terahertz region by using plasma metamaterials

Abstract

A plasma metamaterial that exhibits negative refraction in the terahertz region of the spectrum has been demonstrated in the present communication. The plasma metamaterial is an uniaxial anisotropic metamaterial which is a multilayer stack of alternating plasma layer and background material. The negative refraction in the terahertz region of the proposed metamaterial is explored. The effects of the losses in plasma, plasma density, plasma filling factor, and dielectric constant of background material on the critical frequency and the band width of negative refraction are examined and discussed.

Acknowledgments

This work was supported by the National Natural Science Foundation of China under Grant No. 11205119 and the Fundamental Research Funds for the Central Universities of China. The author thanks the referees for the helpful and constructive advice.