Height Adjustable Phase Plate for Generating Optical Vortices
First Claim
1. A phase plate comprising a plurality of surfaces (24) arranged around a symmetry axis (H) to reflect an incident electromagnetic field (E1) having a null orbital angular momentum, thereby generating a reflected electromagnetic field (E2) having an orbital angular momentum;
- and wherein said surfaces (24) 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 (H), the respective heights define a non-monotonic azimuthal profile, so that said reflected electromagnetic field forms an optical vortex whose topological charge is not associated one-to-one to said orbital angular momentum
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Accused Products
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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Citations
13 Claims
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1. A phase plate comprising a plurality of surfaces (24) arranged around a symmetry axis (H) to reflect an incident electromagnetic field (E1) having a null orbital angular momentum, thereby generating a reflected electromagnetic field (E2) having an orbital angular momentum;
- and wherein said surfaces (24) 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 (H), the respective heights define a non-monotonic azimuthal profile, so that said reflected electromagnetic field forms an optical vortex whose topological charge is not associated one-to-one to said orbital angular momentum
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 13)
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10. A method for generating an electromagnetic field having an orbital angular momentum and forming an optical vortex having a topological charge, said method comprising the steps of:
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providing a phase plate (6) comprising a plurality of surfaces (24) to reflect electromagnetic radiation, the surfaces being arranged around a symmetry axis (H) and mobile parallel to the symmetry axis independently from one another; and arranging said surfaces (24) so that, with respect to a cylindrical reference system in which the azimuth coordinate is measured in a plane perpendicular to the symmetry axis (H), the respective heights define a non-monotonic azimuthal profile, so that said topological charge is not associated one-to-one to said orbital angular momentum - View Dependent Claims (11, 12)
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Specification