Geometric phase lens
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A geometric phase lens, also known as a polarization directional lens, is a kind of metasurface, or diffractive optical element that transforms the wavefront of incoming radiation depending on its polarization state. Thus, at a certain position of the geometric phase lens, a collimated wavefront with right-hand circular polarization will be transformed into a converging wavefront with left-hand circular polarization. If, however, such a lens, without changing its position, is illuminated by a collimated wavefront with left-hand circular polarization, then it transforms it into a beam with a divergent wavefront. If a geometric phase lens is illuminated with linearly polarized radiation, it will immediately form two circularly polarized beams: the first is a converging one and the second is diverging one. And the direction of circular polarization of these formed beams will be determined by the mutual arrangement of the lens and the polarization vector of the linearly polarized input beam.
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