High-purity red coloration via mode-selective absorption in a layered thin-film cavity

He, De; Liu, Zhijun; Fernandes, Gustavo E.; Shen, Tianyi; Oller, Declan; Pacifici, Domenico; Kim, Jin Ho; Xu, Jimmy

doi:10.1063/1.5016990

Cited by 12 publications

(8 citation statements)

References 22 publications

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“…Vibrant colors may be realized using an FP cavity in reflection. The color coverage is still smaller than the sRGB color space based on reported works (<60%), − though high-purity additive primary colors exceeding the sRGB space have been achieved recently through tuning the complex refractive index of layers in the asymmetric FP cavity. , While FP cavity designs are relatively simple, they require height variations and thus pose challenges in nanofabrication, that has been developed to achieve structures with uniform heights.…”

Section: Structural Color Generation Methods and Relevant Applicationsmentioning

confidence: 94%

Nanophotonic Structural Colors

et al. 2020

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Structural colors traditionally refer to colors arising from the interaction of light with structures with periodicities on the order of the wavelength. Recently, the definition has been broadened to include colors arising from individual resonators that can be subwavelength in dimension, e.g., plasmonic and dielectric nanoantennas. For instance, diverse metallic and dielectric nanostructure designs have been utilized to generate structural colors based on various physical phenomena, such as localized surface plasmon resonances (LSPRs), Mie resonances, thin-film Fabry-Pérot interference, and Rayleigh-Wood diffraction anomalies from 2D periodic lattices and photonic crystals. Here, we provide our perspective of the key application areas where structural colors really shine, and other areas where more work is needed. We review major classes of materials and structures employed to generate structural coloration and highlight the main physical resonances involved.

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Section: Structural Color Generation Methods and Relevant Applicationsmentioning

confidence: 94%

Nanophotonic Structural Colors

et al. 2020

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“…Several studies have attempted to expand the gamut and have mainly focused on the following three methods: (1) adding absorption layers, − (2) adding dyes , in MIP structures, and (3) designing metamaterials based on the F–P effect. ,, Because of the different absorption properties of materials, increasing the number of absorption layers (i.e., Al, Cr, Ni, etc.) in the structure can induce various absorptions, thereby increasing the absorption band and color saturation, which ultimately expands the gamut .…”

Section: Introductionmentioning

confidence: 99%

Simulations of a Wide-Gamut and Angle-Dependent Color Reflector by Addition of a Nanometer-Thick Interference Medium in a Fabry–Perot Structure

Chen

Liu

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Traditional Fabry−Perot (F−P) structures comprising "metal/interference medium/phase-change material (PCM)" (MIP) nanostructures have achieved a color gamut close to the standard RGB (sRGB) space. However, the narrow absorption band in the visible region hinders further improvement in the gamut. Nonetheless, a large gamut is critical for display and imaging devices. This paper proposes a reflector nanostructure consisting of "metal/interference medium/phase-change materials (PCMs)/interference medium" (MIPI) to regulate the optical reflection in the visible waveband. We performed simulations to demonstrate that the addition of a 100−250-nm-thick interference medium causes the structure to change from a single to compound interference effect, thus significantly expanding the gamut (51% larger than that of the traditional MIP structure). The influences of the structure geometry and phase changes of the PCM layer on the spectral regulation were analyzed by combining experimental and simulation methods. The results indicate that the proposed structure covers almost the entire sRGB gamut. Moreover, adding the second interference medium induces a longer optical path of the incident light, which renders the structure color-sensitive to the observation angle, thus allowing for the demonstration of an anti-counterfeiting application. This nanoscale MIPI design can serve as a basis for the realization of color-regulation devices and encryption applications.

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“…However, it is difficult to achieve saturation regulation, which has garnered considerable attention. He et al [22] achieved a highly saturated red color by placing an ultrathin absorption layer in the target spectral band using a mode-selection absorption mechanism. However, this method is inadequate for other colors.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the adjustable range of saturation in color reflectors using a phase-change material as an effective absorption base

Chen¹,

Liu²,

Zhang³

et al. 2022

J. Phys. D: Appl. Phys.

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Structural color technology has garnered extensive attention in the development of ink-free color technology for applications such as color displays, color reflectors, and colorimetric devices. A Fabry–Perot (F–P) structure formed by stacking a metal base, an interference cavity, and a phase change material layer (MIP) is of significant interest as a lithography-free and scalable color-reflecting structure. Such a structure can selectively reflect interfered light over a range of visible wavelengths, resulting in bright colors. However, obtaining a wide range of saturation regulation spaces has become a challenge. In this study, an F–P color reflector based on a phase-change material (PCM) base is proposed, which consists of a PCM base, an interference layer, and a PCM top layer (PIP). The results of the finite element simulation and experimental measurements demonstrated that the PIP reflector had an adjustable saturation range 10.75 times larger than that of the MIP reflector. The effects of the structure size and phase change of the PCM layer on the structural characteristics were further analyzed. In addition, the performance of laser-induced color change and its application in color printing were demonstrated. The present study sheds new light on color reflectors, and the strategy proposed indicates their potential optoelectronic applications based on saturation modulation.

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High-purity red coloration via mode-selective absorption in a layered thin-film cavity

Cited by 12 publications

References 22 publications

Nanophotonic Structural Colors

Nanophotonic Structural Colors

Simulations of a Wide-Gamut and Angle-Dependent Color Reflector by Addition of a Nanometer-Thick Interference Medium in a Fabry–Perot Structure

Enhancing the adjustable range of saturation in color reflectors using a phase-change material as an effective absorption base

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