Open investigation on the interaction length between a terahertz wave and an embedded dielectric ZRIM structure, and also phase tuning.

Abstract

In this paper, we have focused on the near field behaviour of 2D Photonic Crystal-based dielectric zero refractive index metamaterial lattices with cylindrical silicon rods embedded in THz waveguides having PMC sidewalls. An "interaction length" is expected in both input and output sides of a ZRIM lattice, after illumination of a TE polarized THz electromagnetic wave. In other words, by getting closer than a specific distance to the ZRIM lattice area from both input and output sides, which is called the interaction length, the wave profile will be affected significantly. Studying the field profile variation in the output side of the ZRIM lattice, we have considered two separate cascaded 2D PC-based ZRIM lattices in a THz waveguide with the same conditions and computed spatial phase shifts, and also the transmission and reflection coefficients versus the displacement between the two ZRIM lattices. This small limited distance led us to an almost 34° phase shift tuning between THz waves in two (multiple) THz waveguide systems.