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Related Experiment Video

Updated: Jun 10, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Dynamic Evolution-Controlled Parabolic-Shaped Microstructures for Ultra-Black Surface via Self-Assembled Microsphere

Yiming Li1,2, Jianwei Wang3, Guoxu Yu1,2

  • 1State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 9, 2026
PubMed
Summary

Researchers developed a novel method to create ultra-black surfaces for optical instruments. This technique uses self-assembled microsphere etching to form parabolic microstructures, significantly reducing stray light across a broad spectrum.

Keywords:
broadband antireflectionmicrosphere mask etchingsidewall curvature controlultra‐black surfaces

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Nanotechnology

Background:

  • Suppressing broadband stray light is crucial for advanced optical instruments.
  • Conventional blackening methods have limitations in spectral range, surface conformity, and substrate compatibility.

Purpose of the Study:

  • To develop a new fabrication approach for creating broadband ultra-black surfaces.
  • To improve stray light management in optical instrumentation.

Main Methods:

  • Fabrication of parabolic microstructures on blackout-ink coatings using self-assembled microsphere mask etching.
  • The process involves spray-coating, dry etching, and time-dependent shadowing evolution.
  • Applicable to various substrates including glass, metal, and polymers, on both planar and curved surfaces.

Main Results:

  • Achieved an average reflectance of 0.89% over the 300-1700 nm spectral range.
  • Demonstrated uniform microstructure formation without lithography or substrate-specific optimization.
  • The parabolic structures enable continuous refractive-index grading and efficient photon trapping.

Conclusions:

  • Established a practical and broadly applicable route for producing broadband ultra-black surfaces.
  • Revealed a mechanism linking microsphere-mediated morphology to optical suppression.
  • Offers a straightforward pathway for enhancing stray-light management in precision optical systems.