Investigation of characteristics of Terahertz double clad fiber made from negative index meta-material

This study presents a double clad fiber with an inner and outer clad made from negative index materials. The mode matching method demonstrates the dispersion characteristics of the negative index material. The numerical results show that the parameters enable the meta-material double clad fiber work in the Terahertz band. The negative index material in double clad Terahertz fiber exhibits characteristics different from conventional fibers, such as a relatively wide TE mode transmission frequency band, stable frequency characteristics related to inner clad thickness, a broadband transmission effect in the HE mode under a low refraction index, and a relatively wider TE mode transmission band under a higher refraction index. This kind of negative index material in double clad Terahertz fiber may be implemented in Terahertz communication. Such an approach can be employed in a variety of frequency bands.