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Title: Split in phase singularities of an optical vortex by off-axis diffraction through a simple circular aperture

Abstract

Here, diffraction patterns of an optical vortex through several shaped apertures reveal its topological charge. In this letter, we theoretically and experimentally show that diffraction of a Laguerre Gaussian beam through a circular aperture at an off-axis position can be used to determine the magnitude and sign of the topological charge. To our knowledge, this is the first time that a simple circular aperture has been used to detect orbital angular momentum of an incident optical vortex.

Authors:
 [1];  [2]
  1. National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan); Mississippi State Univ., Mississippi State, MS (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1363080
Alternate Identifier(s):
OSTI ID: 1348968
Report Number(s):
JLAB-ACC-17-2423; DOE/OR/23177-4080
Journal ID: ISSN 0146-9592; OPLEDP
Grant/Contract Number:
AC05-06OR23177
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 7; Journal ID: ISSN 0146-9592
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; apertures; diffraction; optical vortices; computer holography

Citation Formats

Taira, Yoshitaka, and Zhang, Shukui. Split in phase singularities of an optical vortex by off-axis diffraction through a simple circular aperture. United States: N. p., 2017. Web. doi:10.1364/OL.42.001373.
Taira, Yoshitaka, & Zhang, Shukui. Split in phase singularities of an optical vortex by off-axis diffraction through a simple circular aperture. United States. doi:10.1364/OL.42.001373.
Taira, Yoshitaka, and Zhang, Shukui. Wed . "Split in phase singularities of an optical vortex by off-axis diffraction through a simple circular aperture". United States. doi:10.1364/OL.42.001373. https://www.osti.gov/servlets/purl/1363080.
@article{osti_1363080,
title = {Split in phase singularities of an optical vortex by off-axis diffraction through a simple circular aperture},
author = {Taira, Yoshitaka and Zhang, Shukui},
abstractNote = {Here, diffraction patterns of an optical vortex through several shaped apertures reveal its topological charge. In this letter, we theoretically and experimentally show that diffraction of a Laguerre Gaussian beam through a circular aperture at an off-axis position can be used to determine the magnitude and sign of the topological charge. To our knowledge, this is the first time that a simple circular aperture has been used to detect orbital angular momentum of an incident optical vortex.},
doi = {10.1364/OL.42.001373},
journal = {Optics Letters},
number = 7,
volume = 42,
place = {United States},
year = {Wed Mar 29 00:00:00 EDT 2017},
month = {Wed Mar 29 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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  • We propose a scheme to trap cold atoms (or molecules) by using an improved red- or blue-detuned far-field optical trap, which is formed by an optical system composed of a binary phase plate and a circular aperture illuminated by a plane light wave. We calculate the relative intensity distribution of the far-field trap and study its dependence on the phase phi of the binary phase plate. Our study shows that the binary phase plate can be used to improve some geometric and optical parameters of the far-field optical trap, and realize the evolution of the far-field optical trap from amore » red-detuned trap to a blue-detuned one. In particular, when the phase phi of the binary phase plate is changed from 0 to -pi, the maximum intensity of the far-field trap and its well depth will be enhanced by approx4 times, and the corresponding trapping volume will be increased by approx8 times, with respect to a trapping beam obtained from the diffraction by a circular aperture.« less
  • Diffraction of uniformly polarized laser beams with vortex phase singularity is theoretically analyzed using the plane wave expansion. It is shown that for a high numerical aperture, an intense longitudinal electric field component is formed on the optical axis in this case. It is numerically demonstrated that an analogous effect is ensured for diffraction of a conventional Gaussian beam from asymmetric binary axicons. The field intensity on the optical axis can be varied either by rotating the optical element or by changing the direction of polarization of radiation.
  • The Gaussian beam diffraction by a thin amplitude grating with a dislocation shifted relative to the beam axis is considered. The first-order diffracted beam with an off-axis optical vortex is represented as a superposition of Laguerre - Gauss modes. The optical scheme permitting the spatial separation of modes with even and odd mode indices is proposed and realised experimentally. The method of separation is based on the difference in Gouy phase shifts for focused beams. The possibility of separating photons with zero and nonzero orbital angular momentum is discussed. (laser applications and other topics in quantum electronics)