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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 3 — Feb. 1, 2010
  • pp: 2339–2344

Fabrication and Testing of l = 2 Optical Vortex phase masks for Coronography

Elettra Mari, Gabriele Anzolin, Fabrizio Tamburini, Mauro Prasciolu, Gabriele Umbriaco, Antonio Bianchini, Cesare Barbieri, and Filippo Romanato  »View Author Affiliations

Optics Express, Vol. 18, Issue 3, pp. 2339-2344 (2010)

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In this paper we present the fabrication process and tests of two different types of l = 2 spiral phase plates (SPPs), designed for an Optical Vortex Coronagraph (OVC) in the visible wavelength regime. Each phase mask is realized dividing the spirals area in sectors respectively of 8 and 512 of levels using lithographic nanofabrication approach. The SPPs produces different optical vortices (OVs) with topological charge l that depends on the number of steps and on the wavelength. We found that the residual light in the central dark region of the OV tends to zero as the number of steps increases.

© 2010 OSA

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(350.1260) Other areas of optics : Astronomical optics
(050.4865) Diffraction and gratings : Optical vortices
(110.6895) Imaging systems : Three-dimensional lithography

ToC Category:
Imaging Systems

Original Manuscript: November 30, 2009
Revised Manuscript: December 18, 2009
Manuscript Accepted: December 19, 2009
Published: January 21, 2010

Elettra Mari, Gabriele Anzolin, Fabrizio Tamburini, Mauro Prasciolu, Gabriele Umbriaco, Antonio Bianchini, Cesare Barbieri, and Filippo Romanato, "Fabrication and Testing of l = 2 Optical Vortex phase masks for Coronography," Opt. Express 18, 2339-2344 (2010)

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