Up Scalable Full Colour Plasmonic Pixels with Controllable Hue, Brightness and Saturation

Area of Science:

• Nanotechnology
• Materials Science
• Optics

Background:

• Developing ink-free color printing techniques using nanostructured materials is a key scientific interest.
• Metal nanostructures show promise for creating vibrant colors by manipulating light absorption and scattering.
• Practical applications require tunable, distinct colors with controllable attributes and cost-effective fabrication.

Purpose of the Study:

• To present a simple and efficient ink-free color printing approach using plasmonic pixels.
• To demonstrate controllable color attributes (hue, brightness, saturation) across the visible spectrum.
• To explore the use of aluminum nanostructures for commercial applications.

Main Methods:

• Utilizing sub-micrometer scale plasmonic pixels made of a single constituent metal.
• Achieving near-unity broadband light absorption at two distinct wavelengths per pixel.
• Tuning color attributes by adjusting two different parameters of the same pixel.

Main Results:

• Creation of saturated colors through broadband light absorption at specific wavelengths.
• Demonstration of controllable color attributes (hue, brightness, saturation) via pixel parameter adjustments.
• Exhibited linear dependence of color attributes on pixel parameters, enabling automation.

Conclusions:

• The developed color printing strategy is efficient, cost-effective, and utilizes stable aluminum.
• The tunable nature of the plasmonic pixels allows for a wide range of color generation.
• This approach is suitable for commercial applications like security printing, product coloration, and functional decoration.