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Non-iridescent yet angle-dependent structural colors on titanium surfaces induced by laser oxidation
XiaoSong Yu1,2, MingYang Wang1,3, QiLin Jiang1,4
1Hangzhou Institute of Technology, Xidian University, 311200, Hangzhou, China.
Nanophotonics (Berlin, Germany)
|September 2, 2025
Summary
Researchers developed a novel laser-induced oxidation method to create durable, angle-dependent structural colors on titanium. This environmentally friendly technique offers new possibilities for anti-counterfeiting and product design, moving beyond traditional inks.
Area of Science:
- Materials Science
- Optics
- Surface Engineering
Background:
- Optically variable features are crucial for product design and anti-counterfeiting.
- Existing methods using chemical inks have environmental drawbacks and limited durability.
Purpose of the Study:
- To demonstrate a novel method for generating angle-dependent structural colors on titanium surfaces.
- To provide an environmentally friendly and durable alternative to chemical inks for optical features.
Main Methods:
- Utilizing nanosecond laser-induced oxidation to create periodically arranged stepped structures on titanium.
- Employing numerical simulations to elucidate the formation mechanism involving laser ablation, oxidation, and thermal radiation.
- Tuning laser parameters like point distance and dwell time to control structural morphology and color intensity.
Main Results:
- Successfully generated non-iridescent, angle-dependent structural colors on titanium.
- The color variation is attributed to morphological differences in the stepped structures, reflecting light at distinct angles.
- Demonstrated control over the affected area and intensity of the laser-induced processes.
Conclusions:
- The laser-induced oxidation technique offers a robust and eco-friendly approach to creating structural colors.
- This method presents significant potential for advanced anti-counterfeiting solutions and novel laser coloring applications.
- The findings expand the scope of laser-based surface modification for functional optical properties.
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