Abstract
Metasurface holograms are typically fabricated on rigid substrates. Here we experimentally demonstrate broadband, flexible, conformable, helicity multiplexed metasurface holograms operating in the visible range, offering increased potential for real life out-of-the-lab applications. Two symmetrically distributed holographic images are obtained when circularly polarized light impinges on the reflective-type metasurface positioned on non-planar targets. The two off-axis images with high fidelity are interchangeable by controlling the helicity of incident light. Our metasurface features the arrangement of spatially varying gold nanorods on a flexible, conformable epoxy resist membrane to realize a Pancharatnam-Berry phase profile. These results pave the way to practical applications including polarization manipulation, beam steering, novel lenses, and holographic displays.
Highlights
Metasurfaces (MSs) are ultra-thin artificial materials made of individual structures, called meta-atoms
Helicity multiplexed holograms differ from conventional linearly polarized holograms in that the two centrosymmetric images can be exchanged based on the helical direction of incident light
We encode the phase profile in the hologram plane onto the MS by the angle of gold nanorods point by point
Summary
Metasurfaces (MSs) are ultra-thin artificial materials made of individual structures, called meta-atoms. The capability to engineer the phase of an optical beam with high accuracy and spatial resolution is perfectly suited for holographic applications. This has been exploited to demonstrate several applications in security[16], displays[17] and the storage and manipulation of information[18, 19]. Holographic MSs use the 2D arrangement of meta-atoms to produce an image from the scattered incident light. Such an image can be computer generated by means of iterative phase reconstruction algorithms, such as the Gerchberg-Saxton[22]. Our holographic MS works in reflection for incident light, and two image designs were tested with helical polarizations
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