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As a basic optical element, circular polarizer plays significant roles insignal transmission, measurements and life science microscopy.Three-dimensional (3D) chiral structures have been thought to be necessary torealize circular polarizers. Here we demonstrate theoretically andexperimentally for the first time that a high-efficiency circular polarizercould be realized by a single layer of planar 2D chiral structure. Our proposedcircular polarizer is based on unidirectional polarization conversion insteadof circular polarization stop bands. Since two-dimensional planar structurespresent obvious advantage for fabrication and integration on chip, the proposedcircular polarizer is of great interest in integrated optics and microscopy. Itprovides a novel scheme to manipulate polarizations of light wave, as well asTerahertz wave and microwave.

Circular Polarizer Realized by a Single Layer of Planar Chiral Metallic Nanostructure