Broadband angle- and permittivity-insensitive nondispersive optical activity based on planar chiral metamaterials.

ABSTRACT: Because of the strong inherent resonances, the giant optical activity obtained via chiral metamaterials generally suffers from high dispersion, which has been a big stumbling block to broadband applications. In this paper, we propose a type of planar chiral metamaterial consisting of interconnected metal helix slat structures with four-fold symmetry, which exhibits nonresonant Drude-like response and can therefore avoid the highly dispersive optical activity resulting from resonances. It shows that the well-designed chiral metamaterial can achieve nondispersive and pure optical activity with high transmittance in a broadband frequency range. And the optical activity of multi-layer chiral metamaterials is proportional to the layer numbers of single-layer chiral metamaterial. Most remarkably

SUBMITTER: Song K 

PROVIDER: S-EPMC5587580 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature