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Updated: Jun 10, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Rendering SiO₂/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Published on: February 11, 2020

Dynamic Evolution-Controlled Parabolic-Shaped Microstructures for Ultra-Black Surface via Self-Assembled Microsphere

Yiming Li^1,2, Jianwei Wang³, Guoxu Yu^1,2

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

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 9, 2026

Summary

This summary is machine-generated.

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 antireflection microsphere mask etching sidewall curvature control ultra‐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.