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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 13 — Jun. 18, 2012
  • pp: 14064–14074

Helical mode conversion using conical reflector

H. Kobayashi, K. Nonaka, and M. Kitano  »View Author Affiliations

Optics Express, Vol. 20, Issue 13, pp. 14064-14074 (2012)

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In a recent paper, Mansuripur et al. indicated and numerically verified the generation of the helical wavefront of optical beams using a conical-shape reflector. Because the optical reflection is largely free from chromatic aberrations, the conical reflector has an advantage of being able to manipulate the helical wavefront with broadband light such as white light or short light pulses. In this study, we introduce geometrical understanding of the function of the conical reflector using the spatially-dependent geometric phase, or more specifically, the spin redirection phase. We also present a theoretical analysis based on three-dimensional matrix calculus and elucidate relationships of the spin, orbital, and total angular momenta between input and output beams. These analyses are very useful when designing other optical devices that utilize spatially-dependent spin redirection phases. Moreover, we experimentally demonstrate the generation of helical beams from an ordinary Gaussian beam using a metallic conical-shape reflector.

© 2012 OSA

OCIS Codes
(220.2740) Optical design and fabrication : Geometric optical design
(350.1370) Other areas of optics : Berry's phase
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Physical Optics

Original Manuscript: May 9, 2012
Revised Manuscript: May 25, 2012
Manuscript Accepted: May 30, 2012
Published: June 11, 2012

H. Kobayashi, K. Nonaka, and M. Kitano, "Helical mode conversion using conical reflector," Opt. Express 20, 14064-14074 (2012)

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