Metallic helix array as a broadband wave plate

Phys Rev Lett. 2011 Oct 21;107(17):177401. doi: 10.1103/PhysRevLett.107.177401. Epub 2011 Oct 18.


This study demonstrates theoretically and experimentally that a metallic helix array can operate as a highly transparent broadband wave plate in propagation directions perpendicular to the axis of helices. The functionality arises from a special property of the helix array, namely, that two branches of elliptically right-handed and left-handed polarized states are nearly rigidly shifted in frequency and their dispersions are controlled by different mechanisms that can be independently tuned by structural parameters.