Pseudo-planar conjugated swastikas metamaterial with giant circular dichroism and negative refraction at near-infrared region

Abstract

In this paper, a pseudo-planar conjugated swastikas metamaterial (MM) was proposed and investigated numerically at near-infrared region. Numerical results show that the circular dichroism (CD) is more than 25 dB at resonance frequencies. Owing to the stronger chirality, the refractive indices for right-handed and left-handed circularly polarized waves are negative. The surface current distributions are studied to explain mechanism of the chiral behaviors. The pseudo-planar MM is easy to fabricate and thus lead to many applications in photonic devices due to its giant CD effect and negative refraction.

Keywords:

• pseudo-planar metamaterial
• circular dichroism
• negative refractive index

Additional information

Funding

The work was financially support from the Educational Commission of Hubei Province of China [grant number XD2014205], and the National Natural Science Foundation of China [grant number 61463014] and [grant numbers 61263030].