title: Structuring Light by Concentric-Ring Patterned Magnetic Metamaterial Cavities.
abstract: Ultracompact and tunable beam converters pose a significant potential for modern optical technologies ranging from classical and quantum communication to optical manipulation. Here we design and demonstrate concentric-ring patterned structures of magnetic metamaterial cavities capable of tailoring both polarization and phase of light by converting circularly polarized light into a vector beam with an orbital angular momentum. We experimentally illustrate the realization of both radially and azimuthally polarized vortex beams using such concentric-ring patterned magnetic metamaterials. These results contribute to the advanced complex light manipulation with optical metamaterials, making it one step closer to realizing the simultaneous control of polarization and orbital angular momentum of light on a chip.
authors.affiliation: †Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States.
authors.forename: Jinwei
authors.initials: J
authors.lastname: Zeng
authors.affiliation: †Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States.
authors.forename: Jie
authors.initials: J
authors.lastname: Gao
authors.affiliation: ‡Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.
authors.forename: Ting S
authors.initials: TS
authors.lastname: Luk
authors.affiliation: §Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States.
authors.forename: Natalia M
authors.initials: NM
authors.lastname: Litchinitser
authors.affiliation: †Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Yang
keywords: Optical vortex; Pancharatnam−Berry phase optical elements; magnetic metamaterial cavity; orbital angular momentum; spin angular momentum; vector beam