Abstract
The generation of pigment‐free colors by nanostructures and subwavelength patterns has evolved in the last decade and outperformed the conventional paints in terms of durability, recyclability, and environmental friendliness. The recent progress in the field of structural coloration, particularly reflective coloration, offering a full‐color gamut, has realized high‐resolution printing, not attainable by the pigment paints. Herein, an overview of the various systems able to offer reflective coloration for a variety of optical applications with static and dynamic responses is presented. Specifically, an emphasis is given to recent works of the article's authors on the cooperative action of the disordered particles and dipoles that can generate specular reflective colors. In addition, further developments of reflective color nanosystems are discussed. In the first section, an overview of the recent progress in the field of plasmonic reflective structural coloration is provided. The second part of the article deals with the authors’ latest findings with respect to polarizonic color generation and its implementation in various areas ranging from environmental detection and biosensing to colored solar perfect absorbers. The report is wrapped up with an outlook and summary.
Highlights
In the beginning, we should shed light on the meaning and conditions of occurrence of polarizonic resonance
When the Ag–SiO2 nanocomposite is deposited on glass, it produces a polarizonic reflection around the blue part of the visible spectrum, as shown in Figure 21b, which is the same frequency range at which gold experiences its quantum interference between the continuous reflection arising from its free electrons and the localized reflection emerging from its oscillating dipoles at the plasma frequency
Future research will be oriented toward the production of brighter and high-contrast reflective colors that could be achieved by the replacement of metals with polarizonic dielectric nanostructures
Summary
The creation of color has mostly been attributed to synthetic dyes and pigments, where they selectively absorb given wavelengths of incident light and allow the others to be reflected or transmitted. Mudachathi and Tanaka[70] have developed a simple yet operative color printing technique based on submicrometer-scale plasmonic pixels Such pixels made of Al, as large as 260 nm (i.e., slightly over the optical diffraction limit), enabled nearperfect light absorption of two distinct wavelengths, leading to the generation of saturated colors. The plasmonic prints are manufactured based on an electrochemically grown anodic alumina (AAO) template and a sputtered silver island film, which assure a scalable, inexpensive production method (up to the centimeter scale) that is much less complicated than EBL In such a structure, when the average thickness of the silver layer increases, a silver island film is constructed which can notably raise the p–v ratios in the reflection spectra (Figure 9b), leading to the emergence of a vivid pink color. It is noteworthy that aluminum suffers from a high loss leading to a low Q-factor, lowering the color variety in the plasmonic printing.[74,75]
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