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Ultra-Broadband Plane Blackbody by Ultrafast Laser Induced Surface Hierarchical Structuring and Nanodefect
Hongshuai Zhou1, Jinhao Zhang2, Benfeng Bai1
1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.
Advanced Materials (Deerfield Beach, Fla.)
|September 20, 2025
Summary
Researchers developed a novel method using ultrafast lasers to create highly uniform, broadband blackbodies on silicon surfaces. This technique offers superior stability and high emissivity for advanced optical and thermal applications.
Area of Science:
- Materials Science
- Optoelectronics
- Laser Physics
Background:
- Ideal blackbodies are crucial for applications but challenging to create artificially.
- Existing artificial blackbodies suffer from limitations like poor uniformity, low emissivity, and instability.
Purpose of the Study:
- To develop a novel method for fabricating uniform, high-emissivity plane blackbodies.
- To overcome the limitations of traditional artificial blackbody fabrication.
Main Methods:
- Utilized ultrafast laser direct irradiation on doped silicon surfaces.
- Investigated energy negative feedback regulation during laser-material interaction.
- Enabled hierarchical surface structuring and nanodefect engineering.
Main Results:
- Achieved high emissivity (>0.98) over an ultra-broadband spectrum (3-14 µm).
- Created a micro-nano hierarchical cone-array structure that minimizes back-scattering and enhances absorption.
- Demonstrated superior stability and resilience through high-temperature (>900°C) and mechanical tests.
Conclusions:
- The laser-based method offers a stable, efficient approach to fabricating high-performance plane blackbodies.
- The discovered energy feedback mechanism enables simultaneous structural and electronic modification.
- This advancement has significant implications for astronomy, optoelectronics, and thermal engineering.
