title: High Chromaticity Aluminum Plasmonic Pixels for Active Liquid Crystal Displays.
abstract: Chromatic devices such as flat panel displays could, in principle, be substantially improved by incorporating aluminum plasmonic nanostructures instead of conventional chromophores that are susceptible to photobleaching. In nanostructure form, aluminum is capable of producing colors that span the visible region of the spectrum while contributing exceptional robustness, low cost, and streamlined manufacturability compatible with semiconductor manufacturing technology. However, individual aluminum nanostructures alone lack the vivid chromaticity of currently available chromophores because of the strong damping of the aluminum plasmon resonance in the visible region of the spectrum. In recent work, we showed that pixels formed by periodic arrays of Al nanostructures yield far more vivid coloration than the individual nanostructures. This progress was achieved by exploiting far-field diffractive coupling, which significantly suppresses the scattering response on the long-wavelength side of plasmonic pixel resonances. In the present work, we show that by utilizing another collective coupling effect, Fano interference, it is possible to substantially narrow the short-wavelength side of the pixel spectral response. Together, these two complementary effects provide unprecedented control of plasmonic pixel spectral line shape, resulting in aluminum pixels with far more vivid, monochromatic coloration across the entire RGB color gamut than previously attainable. We further demonstrate that pixels designed in this manner can be used directly as switchable elements in liquid crystal displays and determine the minimum and optimal numbers of nanorods required in an array to achieve good color quality and intensity.
authors.forename: Jana
authors.initials: J
authors.lastname: Olson
authors.affiliation: Department of Physics and Astronomy, University of New Mexico , Albuquerque, New Mexico 87131, United States.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Manjavacas
authors.forename: Tiyash
authors.initials: T
authors.lastname: Basu
authors.forename: Da
authors.initials: D
authors.lastname: Huang
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Schlather
authors.forename: Bob
authors.initials: B
authors.lastname: Zheng
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Stephan
authors.initials: S
authors.lastname: Link
keywords: Fano resonance; color; diffractive coupling; nanoparticle arrays; nanorod; surface plasmon