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Wide-Gamut Biomimetic Structural Colors from Interference-Assisted Two-Photon Polymerization.

Hongcheng Gu1, Xiaojiang Liu1, Zhongde Mu2

  • 1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.

ACS Applied Materials & Interfaces
|December 9, 2021
PubMed
Summary

Interference-assisted two-photon polymerization (TPP) fabricates vibrant structural colors by creating multilayered voxels. This improved TPP technique precisely controls vertical features for biomimetic structural colors across the full RGB spectrum.

Keywords:
biomimeticlaser interferencestructural colortwo-photon polymerizationwide gamut

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Area of Science:

  • Nanotechnology
  • Optics
  • Materials Science

Background:

  • Two-photon polymerization (TPP) is a direct laser writing technique for fabricating structural colors.
  • Current TPP methods have limited vertical resolution, hindering coloration capabilities.

Purpose of the Study:

  • To enhance the coloration ability of TPP by improving vertical resolution.
  • To develop a facile and robust method for precise control of vertical features in TPP.
  • To fabricate biomimetic structural colors (BSCs) with a wide color gamut.

Main Methods:

  • Employed an interference-assisted TPP technique utilizing laser interference at a reflective interface.
  • Created periodic energy redistribution along the vertical direction to form multilayer structures.
  • Fabricated BSCs inspired by Morph butterfly wing scales.

Main Results:

  • Achieved precise control over vertical feature size, overcoming TPP's resolution limitations.
  • Systematically studied coloration mechanisms including multilayer and thin-film interference.
  • Generated BSCs spanning the entire red-green-blue (RGB) color space.
  • Demonstrated fabrication of a 1 cm² area within 2.5 hours.

Conclusions:

  • Interference-assisted TPP is a facile and robust method for fabricating high-resolution structural colors.
  • The developed technique enables precise control over vertical features, leading to a broad color gamut.
  • This advanced TPP method is suitable for practical applications in displays, decoration, and sensing.