title: Design and fabrication of a double-axicon for generation of tailorable self-imaged three-dimensional intensity voids.
abstract: We propose a new design for fabrication of a highly power-efficient double axicon to generate self-imaged three-dimensional intensity voids along the propagation of a beam. The conventional conical structure of an axicon is modified and shaped like an axiconlike structure with a double-gradient surface profile. The gradient conical surfaces generate Bessel beams with varying radial wave vectors that are superimposed and interfere to generate a sequence of three-dimensional intensity voids. The proposed element was fabricated using electron-beam lithography, and experimental verification of the design is reported.
authors.affiliation: School of Electrical & Electronic Engineering, Nanyang-Technological University, Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: B P S
authors.initials: BP
authors.lastname: Ahluwalia
authors.forename: W C
authors.initials: WC
authors.lastname: Cheong
authors.forename: X C
authors.initials: XC
authors.lastname: Yuan
authors.forename: L S
authors.initials: LS
authors.lastname: Zhang
authors.forename: S H
authors.initials: SH
authors.lastname: Tao
authors.forename: J
authors.initials: J
authors.lastname: Bu
authors.forename: H
authors.initials: H
authors.lastname: Wang