An ultrathin metasurface is proposed to generate multi-channel vortex beams with equal energy distribution. The phase and amplitude can be separately modulated by tuning the photonic spin-orbit interaction in a rectangular holes array perforated in a nanometer-thin metallic film. This design may enable miniaturized and high-capacity on-chip multiplexing and de-multiplexing vortex beam generators.
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Jin et al. (2016) studied this question.
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