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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 12 — Jun. 16, 2014
  • pp: 14712–14726

Modular spiral phase plate design for orbital angular momentum generation at millimetre wavelengths

Peter Schemmel, Giampaolo Pisano, and Bruno Maffei  »View Author Affiliations


Optics Express, Vol. 22, Issue 12, pp. 14712-14726 (2014)
http://dx.doi.org/10.1364/OE.22.014712


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Abstract

Proof of concept measurements of a modular spiral phase plate design able to generate millimetre wavelength beams with an azimuthal mode number of l = ±10 are presented. The plate is comprised of ten single modules that interlock to create the full plate assembly, allowing improved machining accuracy compared to standard techniques. Therefore, this design could be used in millimetre wavelength systems that require the manipulation of large OAM modes. The plate was manufactured from polypropylene (index of refraction n ≈ 1.5), and was measured at 100GHz. A three dimensional field scanner was used to measure three near field surfaces behind the plate. Intensity measurements showed the expected OAM intensity ring, and phase measurements showed ten phase dislocations, implying proper functionality.

© 2014 Optical Society of America

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(120.5800) Instrumentation, measurement, and metrology : Scanners
(350.4010) Other areas of optics : Microwaves
(350.5030) Other areas of optics : Phase
(350.5500) Other areas of optics : Propagation

ToC Category:
Diffraction and Gratings

History
Original Manuscript: March 5, 2014
Revised Manuscript: April 23, 2014
Manuscript Accepted: April 23, 2014
Published: June 9, 2014

Citation
Peter Schemmel, Giampaolo Pisano, and Bruno Maffei, "Modular spiral phase plate design for orbital angular momentum generation at millimetre wavelengths," Opt. Express 22, 14712-14726 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-12-14712


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