Silicon Nanostructures for Bright Field Full Color Prints

Abstract

Nanoscale color printing has recently emerged as a unique alternative to traditional pigments by providing record spatial resolution, angular independent, durable and single material colors. Widely based on plasmonic nanostructures, numerous efforts in the field have aimed at extending color range and saturation relying on a variety of designs and metals. Alternatively, silicon nanostructures support finely tunable electric and magnetic multipolar resonances, afford low absorption losses and benefit from well-established industrial fabrication processes, all features ideally suited to nanoscale color printing. Here we compare the properties of silicon nanodiscs with those of aluminum and silver plasmonic elements for the specific purpose of nanoscale color reproduction targeting the coverage of a broad and vivid color palette. We highlight the different properties of such metallic and dielectric resonators in various geometric and illumination conditions leading to the optimization of silicon nanodisc arrays for the fabrication of high resolution color features as well as millimetric paining replicas. The fabricated structures span a large, continuous color range with varying hue and saturation that is visible by conventional optical microscopy, photography as well as the bare eye under white light illumination. High-throughput electron beam lithography as well as color mixing schemes are discussed to further harness the unique properties of silicon nanodiscs as color elements, paving the way for a broader exploitation of nanoscale color printing.

A Plasmonic Painter’s Method of Color Mixing for a Continuous Red–Green–Blue Palette

“…As a result, color mixing of two primary colors with a close to independent adjustment of the individual color contributions is attained. This is in contrast to other color mixing schemes, which rely either on spatially separated pixels for each primary color 25 or on fixed mixing ratios 16,19 . Figure 3d summarizes the chromaticity values of the color gradient of Fig.…”

“…Based on these, we demonstrate an original, additive plasmonic RGB color mixing approach that allows representing countless numbers of colors within a color gamut that continuously spans 39% of the sRGB color gamut. The demonstrated level of control over color chromaticity and brightness, the continuous coverage of a color gamut and the photorealistic reproduction of images represent a large step forward compared to the state of the art, where the luminance of the colors cannot be easily adjusted 9,10,21,26 or other color mixing approaches where the number of colors are limited 16,19,25 . Furthermore, our method of using a single multi-resonant triplet color pixel increases the resolution by a factor of 7 and greatly increases color uniformity, as compared to a recently demonstrated CMYK color mixing approach 25 .…”

“…This enables the representation of smooth photorealistic color and brightness transitions and a Page 4 of 25 continuous coverage of over 39% of the sRGB color gamut. This is a large step forward with respect to the state of the art, where, instead, discrete color hues and tones were reproduced 4,5,[18][19][20][21]26,6,7,[9][10][11][13][14][15] .…”

Fano-resonances in High Index Dielectric Nanowires for Directional Scattering

“…In perfect analogy to plasmonics, it is possible to design color filters [36] and (color) holograms [37,38] or to use dielectric nano-structures for "colorprinting" at the diffraction limit [39,40].…”

Спектральные Характеристики Отражения Микромассивов Кремниевых Нанопилларов-=sup=-*-=/Sup=-

“…nanopillar -наностолбик) привлекает значительный интерес иссле-дователей [1][2][3][4]. Массивы кремниевых нанопилларов (Si НП) могут работать как эффективный сенсор с высокой чувствительностью к изменению показателя преломления среды, которая их окружает [5].…”