title: Wave front engineering from an array of thin aperture antennas.
abstract: We propose an ultra-thin metamaterial constructed by an ensemble of the same type of anisotropic aperture antennas with phase discontinuity for wave front manipulation across the metamaterial. A circularly polarized light is completely converted to the cross-polarized light which can either be bent or focused tightly near the diffraction limit. It depends on a precise control of the optical-axis profile of the antennas on a subwavelength scale, in which the rotation angle of the optical axis has a simple linear relationship to the phase discontinuity. Such an approach enables effective wave front engineering within a subwavelength scale.
authors: Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, China.
authors: Ming
authors: M
authors: Kang
authors: Tianhua
authors: T
authors: Feng
authors: Hui-Tian
authors: HT
authors: Wang
authors: Jensen
authors: J
authors: Li