One-dimensional chirality : strong optical activity in epsilon-near-zero metamaterials
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We suggest that electromagnetic chirality, generally displayed by 3D or 2D complex chiral structures, can occur in 1D patterned composites whose components are achiral. This feature is highly unexpected in a 1D system which is geometrically achiral since its mirror image can always be superposed onto it by a 180 deg rotation. We analytically evaluate from first principles the bianisotropic response of multilayered metamaterials and we show that the chiral tensor is not vanishing if the system is geometrically one-dimensional chiral; i.e., its mirror image cannot be superposed onto it by using translations without resorting to rotations. As a signature of 1D chirality, we show that 1D chiral metamaterials support optical activity and we prove that this phenomenon undergoes a dramatic nonresonant enhancement in the epsilon-near-zero regime where the magnetoelectric coupling can become dominant in the constitutive relations.
Rizza , C , Di Falco , A , Scalora , M & Ciattoni , A 2015 , ' One-dimensional chirality : strong optical activity in epsilon-near-zero metamaterials ' Physical Review Letters , vol 115 , no. 5 , 057401 . DOI: 10.1103/PhysRevLett.115.057401
Physical Review Letters
© 2015 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1103/PhysRevLett.115.057401
A. C. and C. R. thank the U.S. Army International Technology Center Atlantic for financial support (Grant No. W911NF-14-1-0315). A. D. F. acknowledges support from EPSRC (EP/I004602/1 and EP/J004200/1).