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Laser patterning captured in real-time: surface modifications of multilayer thin-films under nanosecond laser heating
Tugba Isik1, Mason Freund2, Will Linthicum2
1School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Nanoscale
|August 15, 2024
Summary
Researchers developed a new laser-assisted method for creating controlled surface wrinkles on titanium/nickel-coated silicon nitride membranes. This technique offers a novel way to fabricate corrugated films with tunable properties for various applications.
Area of Science:
- Materials Science
- Surface Engineering
- Nanotechnology
Background:
- Controlled surface wrinkling is crucial for modifying material properties.
- Existing methods often involve mechanical stretching, limiting material compatibility and scalability.
Purpose of the Study:
- To demonstrate a novel laser-assisted method for inducing periodic wrinkles on multilayer-coated silicon nitride membranes.
- To investigate the mechanisms of corrugated surface formation and material behavior under laser irradiation.
Main Methods:
- Utilized ultrafast transmission electron microscopy (UTEM) to study grain nucleation and growth.
- Employed nanosecond pulsed laser irradiation to induce periodic wrinkling and patterning.
- Applied single-shot imaging to capture film deformation dynamics.
Main Results:
- Successfully demonstrated laser-induced periodic wrinkling on titanium/nickel multilayers on silicon nitride membranes.
- Observed corrugated surface formation on both sides of the thin film.
- Investigated the underlying mechanisms of wrinkle formation and material response.
Conclusions:
- Laser-assisted fabrication provides a fast and versatile route for creating corrugated films.
- This method overcomes limitations of traditional mechanical stretching techniques.
- The findings enable the tailored fabrication of films with specific surface properties for advanced applications.
