Nanoplasmonic color filter on large area at visible region

This work presents plasmonic nanostructures on a large area for visible color filtering. The plasmonic nanostructures comprise alternate layers of silver nanoholes, ultrathin dielectric film, and silver nanoislands on a glass substrate. The plasmonic nanostructures were fabricated on a wafer level by using lithography-free methods such as metal dewetting of silver nanoholes, spin-coating of ultrathin dielectric film, and oblique angled deposition of silver nanoislands. The numerical results showed transmission spectra for subtractive color filtering in visible region. The plasmonic nanostructures have reflective colors from red to blue under white light illumination. This nanoplasmonic substrate can provide a new approach for fabricating practical color display or imaging devices with a low cost.