Abstract-Delay times in a terahertz chiral metamaterial slab

Danka B. Stojanović, Jelena Radovanović, and Vitomir Milanović

https://journals.aps.org/pra/accepted/c707eN27R1015f16343037e92ff7ba1a5d1256329

We investigate the propagation of circularly polarized electromagnetic waves through a free-standing \Omega particle chiral metamaterial slab and study the associated delay times - dwell time and group delay. Through this analysis, we observe different interactions of right and left circularly polarized waves in the terahertz frequency range (1-2.5 THz) with the resonant elements. As a consequence, the resonant-frequency group delay and dwell time of right circularly polarized wave are one or more orders of magnitude longer than that of the left. In addition, we compare the delay times obtained from rigorous numerical simulations with those calculated using the retrieved effective parameters. We find that the dwell time cannot be evaluated correctly from the effective medium approximation while no such problems exist in the case of group delay.