Design and fabrication of a double-axicon for generation of tailorable self-imaged three-dimensional intensity voids

ArticleinOptics Letters 31(7):987-9 · May 2006with5 Reads
Impact Factor: 3.29 · DOI: 10.1364/OL.31.000987 · Source: PubMed

    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.