AI Article Synopsis
- - A novel method is developed for creating structural colors that are not affected by the angle of light, using a unique ultra-thin bilayer absorber made of Ni and GeSbTe, which improves color purity and brightness.
- - The design features a simplified five-layer structure that adjusts oxide layer thickness to achieve a wide range of vibrant colors while ensuring high color levels and consistency.
- - The resulting devices, capable of producing colors like yellow, cyan, and magenta, show impressive performance under various angles and have potential applications in areas like displays, printing, and anti-counterfeiting with cost-effective mass production.
Article Abstract
A novel approach is proposed for generating reflective angle-insensitive structural colors with high purity, high brightness, and a wide color gamut in an asymmetric Fabry-Perot structure based on an ultra-thin bilayer absorber composed of Ni and GeSbTe. The bilayer absorber is designed to have broadband absorption, enhancing the optical absorption across the entire visible spectrum and suppressing the reflection of complementary colors, thereby improving the color purity of reflective colors. By constructing a simplified five-layer structure and controlling only the thickness of the oxide layers, different colors can be achieved while maintaining high levels for all colors. The prepared structural color devices (yellow, cyan, magenta, green, blue, and purple) demonstrate exceptional angle-robust appearance within an incident light range of 0°-60° with reflection peaks exceeding 80%, as demonstrated theoretically and experimentally. This device offers a simple yet effective structure that utilizes a novel material combination and enables cost-effective mass production through just one coating run process. It holds significant potential for diverse applications in micro-nano displays, anti-counterfeiting, color filters, printing, illumination systems, and decorations.
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| http://dx.doi.org/10.1364/OE.529919 | DOI Listing |
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Article Synopsis
- - A novel method is developed for creating structural colors that are not affected by the angle of light, using a unique ultra-thin bilayer absorber made of Ni and GeSbTe, which improves color purity and brightness.
- - The design features a simplified five-layer structure that adjusts oxide layer thickness to achieve a wide range of vibrant colors while ensuring high color levels and consistency.
- - The resulting devices, capable of producing colors like yellow, cyan, and magenta, show impressive performance under various angles and have potential applications in areas like displays, printing, and anti-counterfeiting with cost-effective mass production.
Simplistic metasurface design approach for incident angle and polarization insensitive rcs reduction.
Sci Rep
September 2024
Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Cochin, 682022, India.
This paper proposes the design of a metasurface for polarization and incident angle-insensitive RCS reduction applications. An ellipse-shaped unit cell is utilized as a polarization converter, which is then arranged to form a checkerboard surface. While a single layer checkerboard structure gives a wideband RCS reduction, a double layer structure yields polarization and incident angle independent operation.
View Article and Find Full Text PDFArticle Synopsis
- - Developed and simulated 1D and 2D reflective grating color filters within aluminized polyethylene film, showcasing high performance.
- - Filters demonstrate benefits like angle insensitivity (up to 45° for 1D and 40° for 2D), high reflectance, deep resonance dips, and a wide color range.
- - Employed grating modal analysis to understand the physical mechanisms enabling their angle-insensitive spectral responses, useful for color display and packaging applications.
In many potential applications, there is a high demand for long wavelength infrared (LWIR) absorbers characterized by a compact configuration, broad operational bandwidth, high absorption efficiency, and polarization- and angle-insensitive characteristics. In this study, we design and demonstrate a high-performance broadband LWIR absorber based on coplanar four-sized resonators, consisting of arrays of titanium (Ti) disks with different diameters supported by a continuous zinc selenide (ZnSe) layer and by a Ti film acting as a back-reflector. Particle swarm optimization (PSO) is employed to optimize the complicated geometry parameters, and the final optimized device exhibits near-unity absorption (∼96.
View Article and Find Full Text PDFAsymmetric Plasmonic Moth-Eye Nanoarrays with Side Opening for Broadband Incident-Angle-Insensitive Antireflection and Absorption.
Materials (Basel)
August 2023
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China.
Plasmonic absorbers with broadband angle-insensitive antireflection have attracted intense interests because of its wide applications in optical devices. Hybrid surfaces with multiple different sub-wavelength array units can provide broadened antireflection, while many of these antireflective surfaces only work for specific angles and require high complexity of nanofabrication. Here, a plasmonic asymmetric nanostructure composed of the moth-eye dielectric nanoarray partially modified with the top Ag nanoshell providing a side opening for broadband incident-angle-insensitive antireflection and absorption, is rationally designed by nanoimprinting lithography and oblique angle deposition.
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