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Flexible graphical black structural color with high angular tolerance featuring subwavelength nickel cylinder array

Yun Zhou^1,2,3, Jie Tang^1,2, Heng Zhang^1,2

¹School of Optoelectronics Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, People's Republic of China.

|April 17, 2020

Summary

Researchers developed a low-cost method for creating large-area flexible graphical black structural color (GBSC) devices. This scalable approach overcomes previous limitations, enabling broader applications for advanced optical materials.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Black structural color (GBSC) is valuable for various applications.
Current GBSC fabrication methods (electron beam lithography, focused ion beam) are costly, slow, and limited to small areas.
Flexible GBSC is underexplored due to manufacturing constraints.

Purpose of the Study:

To develop a novel, low-cost, and scalable method for fabricating flexible graphical black structural color (GBSC) devices.
To demonstrate and analyze a new GBSC architecture using a pixelated embedded nickel cylindrical array.
To overcome the limitations of existing GBSC manufacturing techniques.

Main Methods:

Utilized a self-developed continuously variable spatial frequency lithography.
Fabricated a flexible GBSC device based on a pixelated embedded nickel cylindrical array.
Experimentally demonstrated and theoretically analyzed the device's optical properties.

Main Results:

Successfully created a large-area (4 cm × 4 cm) flexible GBSC sample.
Achieved a measured absorbance of approximately 92% across the visible spectrum (400–700 nm).
Maintained desirable absorptivity at incident angles up to 60°.

Conclusions:

The developed lithography technique offers a reliable, low-cost, and scalable approach for GBSC fabrication.
This method enables the production of large-area and flexible GBSC devices.
The facile and controllable process opens new possibilities for industrial GBSC production.