Research / 2019 / Article / Fig 2

Research Article

Encoding and Multiplexing of 2D Images with Orbital Angular Momentum Beams and the Use for Multiview Color Displays

Figure 2

Validation of 2D encoding theory. (a) Measured intensity of the central component in an OAM spectrum by coding an on-axis light feature of 50 μm width with a constant off-axis displacement δ (i.e., ring radius) of 0.425 mm using different on-axis OAM modes: (a1) l=0 (original image), (a2) l=6, (a3) l=9, (a4) l=18, and (a5) radial intensities of Figures 2(a2)–2(a4). (b) Measured intensity of the central component by coding a light feature of 100 μm width with different constant off-axis displacements from the axis of a given OAM mode: (b1) original image of the point at δ1=0 without OAM coding, (b2) a point at δ1=0 coded with mode l=6, (b3) a ring with δ2=0.45 mm coded with mode l=6, (b4) a ring with δ3=0.9 mm coded with mode l=6, (b5) radial intensities of Figures 2(b2)–2(b4). (c) Measured light intensity of the central component as a functional of radial distance r from the on-axis point for different modes l: (c1) radius defined at 10% and 100% of the peak energy and (c2) the relative energy to the input maximum. (d) Calculated radial intensity of the central component for different off-axis displacements.