title: Far-field radially polarized focal spot from plasmonic spiral structure combined with central aperture antenna.
abstract: Manipulation of a vector micro-beam with an optical antenna has significant potentials for nano-optical technology applications including bio-optics, optical fabrication, and quantum information processing. We have designed and demonstrated a central aperture antenna within an Archimedean spiral that extracts the bonding plasmonic field from a surface to produce a new vector focal spot in far-field. The properties of this vector focal field are revealed by confocal microscopy and theoretical simulations. The pattern, polarization and phase of the focal field are determined by the incident light and by the chirality of the Archimedean spiral. For incident light with right-handed circular polarization, the left-handed spiral (one-order chirality) outputs a micro-radially polarized focal field. Our results reveal the relationship between the near-field and far-field distributions of the plasmonic spiral structure, and the structure has the potential to lead to advances in diverse applications such as plasmonic lenses, near-field angular momentum detection, and optical tweezers.
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Mao
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Ren
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Xinrui
authors.initials: X
authors.lastname: Lei
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Kang
authors.initials: K
authors.lastname: Jiang
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Kuanguo
authors.initials: K
authors.lastname: Li
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Chenjing
authors.initials: C
authors.lastname: Cui
authors.affiliation: Center for Micro- and Nanoscale Research and Fabrication, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Wen
authors.affiliation: Department of Optics and Optical Engineering &Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors.forename: Pei
authors.initials: P
authors.lastname: Wang