Fig. 4: Generation of interference-free multi-polarization channels. | Nature Communications

Fig. 4: Generation of interference-free multi-polarization channels.

From: Spin-decoupling of vertical cavity surface-emitting lasers with complete phase modulation using on-chip integrated Jones matrix metasurfaces

Fig. 4

a SEM images of the integrated Jones matrix metasurface (height 750 nm) for directional collimations. The inset is a schematic illustration of a three-channel collimated VCSEL emitting directional RCP, LCP, and LP beams enabled by metasurface integration. In this example, the cross-polarization components (RCP and LCP light) were modulated both by a deflecting PB phase profile and a collimating phase imposed by the propagation phase, while the co-polarization component was only modulated by the propagation phase. As a result, the cross-polarization components were respectively collimated and deflected at 10° (RCP) and −10° (LCP) toward to Y-axis, and the co-polarized light was collimated without deflection. The intensity beam profiles of the VCSEL were recorded along Z direction (b), and at Z = 1 cm (c) without polarizer, respectively, revealing the well separation of those three collimated beams without noticeable interferences along different directions. The SOPs of the generated beams were further determined using polarization analyzers, respectively (d).

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