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We created a novel optical security device that integrates multiplecomputer-generated holograms within a single colour image. Under white light,this "holographic colour print" appears as a colour image, whereas illuminationwith a red, green, or blue beam from a handheld laser pointer projects up tothree different holograms onto a distant screen. In our design, all dielectriclayered pixels comprising phase plates (phase control) and structural colourfilters (amplitude control) are tiled to form a monolithic print, whereinpixel-level control over the phase and amplitude of light allows us tosimultaneously achieve hologram multiplexing and colour image formation. Theentire print is fabricated in a single lithographic process using a femtosecond3D direct laser writer. As the phase and amplitude information is encoded inthe surface relief of the structures, our prints can be manufactured usingnanoimprint lithography and could find applications in document security.

Holographic Colour Prints: Enhanced Optical Security by Combined Phase and Amplitude Control