Height Adjustable Phase Plate for Generating Optical Vortices
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United States of America Patent
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Issued Date -
Jan 31, 2013
app pub date -
Jul 27, 2012
filing date -
Jul 27, 2011
priority date (Note) -
Abandoned
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Abstract
A phase plate including a plurality of surfaces arranged around a symmetry axis to reflect an incident electromagnetic field having a null orbital angular momentum, thereby generating a reflected electromagnetic field having an orbital angular momentum. The surfaces are arranged such that, with respect to a cylindrical reference system in which the azimuthal coordinate is measured in a plane perpendicular to the symmetry axis, the respective heights define a non-monotonic azimuthal profile, so that the reflected electromagnetic field forms an optical vortex whose topological charge is not associated one-to-one to the orbital angular momentum.
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