Add time:07/24/2019         Source:sciencedirect.com

We propose Color (cas 10-83-3) polarization multiplexing metalenses composed by two sets of cross nanoholes etched on the silver film. Cross nanoholes are arranged on the concentric rings and they are optimized to be equivalent to half wave plates for two different wavelengths. This design can ensure the effective conversion between the right-handed and left-handed circular polarization and obtain the focusing field with high signal-to-noise ratio. The phase shift of metalens is introduced through the rotation of the cross nanoholes, and the proposed color polarization multiplexing metalens easily realize the wavelength controllable beam focusing by rotating the cross nanoholes along opposite directions. The polarization conversion theory provides the basis for the design of the metalenses. The simulation experiments for monochromatic and color polarization multiplexing metalenses show the performance of the proposed method. Our designed color polarization multiplexing metalenses possess the advantageous of color control, polarization multiplex and high focusing quality, and they are helpful for the applications of metalenses in optical integration and visible light imaging.

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