Negative Refractive Index with Asymmetric Paired Metal Cut Wires for High Frequency of Terahertz Wave Band

Abstract

A metamaterial can produce a negative refractive index and apply to a superlens overcoming a diffraction limit. We have previously reported that the measurement of asymmetric paired metal cut wires confirms a negative refractive index with a low loss at 0.42 THz. However, it has yet to be shown whether the structure could have a parameter with a negative refractive index at the other frequencies. We confirm that the structure can design a negative refractive index from 0.5 THz to 0.9 THz. This proposed structure with asymmetric paired metal cut wires would provide superlenses and lead to drastic progress of terahertz imaging.