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Aim of this chapter is that readers can obtain an outline about metamaterials from concept to principle after reading.
Concept introduction of negative refraction index was given firstly, including literature review, history regarding the negative
refraction index, and illustration of energy and momentum in negative refractive index materials. Then three types of metamaterials:
electronic metamaterials, magnetic metamaterials, and double negative-index metamaterials were described in this chapter.
School of Physical Electronics University of Electronic Science and Technology of China.