Near-Ultraviolet Structural Colors Generated by AluminumrnNanodisk Array for Bright Image Printing

摘要

Structural colors generated by optical micro- or nanostructures have attractednmuch attention for replacing pigment colors due to their tunability andnsemipermanency. The advantages of structural colors are now ready to benextended to the spectral range outside that of visible wavelengths. Here,nbright structural colors are demonstrated in the near-ultraviolet (near-UV)nwavelength range based on the plasmonic resonance of an aluminumnnanodisk array. Collective plasmonic oscillation of the aluminum nanodisksnselectively reflects the near-UV light with a high reflectance and narrownlinewidth. The color of the reflected light is tuned over the full near-UV range,ndepending on the structural parameters of the nanodisk array. In particular,naluminum nanodisk arrays can be used as structural color pixels that demonstratenprinting of near-UV images with a high resolution of ≈10 000 pixels perninch. The demonstrated near-UV structural colors show significant progressntoward UV filtering and imaging, anticounterfeit, color multiplexing, andnphotocatalysis.