Optical slow - wave metamaterials and their tunability

1. Classical analog of electromagnetically induced transparency for slow light A classical effect of electromagnetically induced transparency (EIT) is demonstrated in a planar metamaterials in the ultraviolet regime. The EIT unit cell consists of a vertical cut wire as the bright resonator and two horizontal cut wire pairs as the dark element. The destructive interference between the two resonance paths leads to an EIT-like transmission spectrum of the metamaterial. This metamaterial design that enables excitation and tuning of the classical EIT effect would eventually lead to the development of electromagnetic slow light devices. And this planar EIT structure can be easily fabricated and integrated as ultra-compact sensor with high sensitivity. In our previous report, some preliminary EIT effort in a dielectric slab waveguide with two nano-sized elliptical silver particles placed inside was proposed. Based on this concept, in this project we have enhanced the contrast between the transmission peak and dip by incorporating the Fabry-Perot resonance effect (see Fig. 3 below).