Negative index optical chiral metamaterial based on asymmetric hexagonal arrays of metallic triangular nanoprisms

作者：Giloan M^*; Astilean S

来源：Optics Communications, 2014, 315: 122-129.

DOI：10.1016/j.optcom.2013.10.070

• Chiral metamaterial
• Negative index
• Hybridized plasmon mode
• Circular polarization

Nanostructures made of two layers of metallic triangular nanoprisms arranged in hexagonal lattice separated by a dielectric layer are theoretically analyzed as chiral metamaterial slabs. Transmitted and reflected electromagnetic field of normally incident circular polarized plane waves are computed using a tri-dimensional (3D) finite-difference time domain (FDTD) algorithm. Chirality and effective constitutive parameters are calculated using the modified S-parameter retrieval method for chiral metamaterials. Different hybridized plasmon modes are induced by the left and right circularly polarized light leading to a chiral behavior of the asymmetric type metamaterials. Negative refractive index due to chirality is obtained in the near infrared range of the spectrum for either left or right polarization.

• 出版日期2014-3-15