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Title: Optical fiber antenna generating spiral beam shapes

A simple method is proposed here to generate vortex beam and spiral intensity patterns from a Gaussian source. It uses a special type of optical fiber antenna of aperture ∼80 nm having naturally grown surface curvature along its length. The antenna converts linearly polarized Gaussian beam into a beam with spiral intensity patterns. The experimentally obtained spiral patterns with single and double spiral arms manifest the orbital angular momentum, l = ±1, 2, carried by the output beam. Such beam can be very useful for optical tweezer, metal machining, and similar applications.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. CSIR-Central Scientific Instruments Organization, Sector-30, Chandigarh 160030 (India)
  2. Banwarilal Bhalotia College, Asansol, West Bengal 713303 (India)
Publication Date:
OSTI Identifier:
22280716
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTENNAS; APERTURES; GAUSS FUNCTION; GAUSSIAN PROCESSES; MACHINING; OPTICAL FIBERS; ORBITAL ANGULAR MOMENTUM; SURFACES; VORTICES