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Dual Color Plasmonic Pixels Create a Polarization Controlled Nano Color Palette Zhibo Li, Alasdair W. Clark, and Jonathan M. Cooper ACS Nano, Just Accepted Manuscript • DOI: 10.1021/acsnano.5b05411 • Publication Date (Web): 02 Dec 2015 Downloaded from http://pubs.acs.org on December 7, 2015
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Dual Color Plasmonic Pixels Create a Polarization Controlled Nano Color Palette Zhibo Li, Alasdair W. Clark*, Jonathan M. Cooper Biomedical Engineering Research Division, School of Engineering, Rankine Building, University of Glasgow, Glasgow, G12 8LT Email:
[email protected], Tel: 0141 330 3216
Abstract Color filters based upon nano-structured metals have garnered significant interest in recent years, having been positioned as alternatives to the organic dye-based filters which provide color selectivity in image sensors, as non-fading ‘printing’ technologies for producing images with nanometer pixel resolution, and as ultrahigh-resolution, small foot-print optical storage and encoding solutions. Here, we demonstrate a plasmonic filter set with polarization-switchable color properties, based upon arrays of asymmetric cross-shaped nano-apertures in an aluminum thinfilm. Acting as individual color-emitting nano-pixels, the plasmonic cavity-apertures have dual-color selectivity, transmitting one of two visible colors, controlled by the polarization of the white light incident on the rear of the pixel and tuned by varying the critical dimensions of the geometry and periodicity of the array. This structural approach to switchable optical filtering enables a single nano-aperture to encode
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two information states within the same physical nano-aperture; an attribute we use here to create micro image displays containing duality in their optical information states.
Keywords: nanoplasmonics, metasurfaces, color printing, plasmonic pixels, color filter, nano cavity apertures, nano holes.
A trait that nearly all imaging and display technologies share is the requirement to selectively project or collect light of different wavelengths; breaking white-light down into component parts (typically red, green and blue) for color image recording or projection. This separation is achieved through the inclusion of various filters, which in most commercial applications are based on absorption via organic dyes; facilitating the need for relatively thick polymer materials with long optical paths that are not conducive to high pixel densities, and are also prone to environmental damage and degradation. As an alternative to these strategies, inorganic nano-scale filters based on engineered metal nanostructures are becoming increasingly appealing.1
2, 3
Structural nano-filters separate light due to the engineered plasmon
resonances of their constituent nanostructures. Determining which wavelengths of
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light are absorbed, scattered or transmitted, the resonant characteristics of a particular structure can be tuned by altering its geometry and composition.4 Unlike conventional dye-doped polymers, these plasmonic filters can perform over length scales of
