Ultra-thin Polarization-insensitive Plasmon-induced Transparency Metamaterials

An ultra-thin polarization insensitive plasmon-induced transparency (PIT) is proposed in this article. The height (t) of this PIT meta-materials can be the thinnest so far (reach to 1/90λ), due to the strong magnetic coupling between the top and below layers. This method makes it easy to fabricate the meta-materials with low profile and satisfying performances. We can also obtain variety of group indices and transmissive peaks by adjusting the height of the PIT structure. Furthermore, the PIT transmissive spectrum under the orthogonal polarized incident electromagnetic (EM) wave are identical, which is attributed to the PIT meta-material’s center symmetrical. Finally, we conduct simulations and analysis based on the Lorentz oscillator model. These results obtained by the different techniques were in good agreement. All of above properties make this ultra-thin PIT have potential application in compact slow light devices.