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Controllable Plasmonic Nanostructures induced by Dual-wavelength Femtosecond Laser Irradiation
Weina Han1,2, Lan Jiang3,4, Xiaowei Li2
1Beijing Engineering Research Center of Applied Laser Technology, Institute of Laser Engineering, Beijing University of Technology, Beijing, 100124, P.R. China.
Scientific Reports
|December 13, 2017
Summary
A novel dual-wavelength femtosecond laser technique creates unique annular energy deposition, enabling the lithography-free fabrication of functional gold nanostructures with tunable optical properties.
Area of Science:
- Laser-induced materials processing
- Plasmonics and nanophotonics
- Thin film nanotechnology
Background:
- Femtosecond lasers offer precise energy deposition for materials modification.
- Plasmonic nanostructures exhibit unique optical properties dependent on their morphology.
- Fabricating complex nanostructures often requires multi-step and lithographic processes.
Purpose of the Study:
- To develop a simple, lithography-free method for fabricating functional plasmonic nanostructures.
- To investigate the use of dual-wavelength femtosecond laser energy deposition for controlled nanostructure formation.
- To characterize the optical properties of the fabricated nanostructures.
Main Methods:
- Utilizing a dual-wavelength femtosecond Ti:sapphire laser (fundamental frequency ω and second-harmonic frequency 2ω) to generate an annular energy deposition profile.
- Applying laser-induced dewetting on thin gold films to induce surface patterning and nanoscale hydrodynamic instability.
- Controlling nanostructure morphology by adjusting laser irradiation parameters.
- Employing ion-beam polishing for dimensional reduction and film removal.
Main Results:
- Demonstrated an abnormal double-peak (annular shaped) energy deposition profile.
- Successfully fabricated gold nanostructures using a single-step, lithography-free process.
- Achieved controlled modulation of nanostructure morphology (shape, size, distribution) by tuning laser parameters.
- Observed unique optical properties in gold nanobumps, including a resonance-scattering spectrum with two distinct peaks, unlike nanoparticles.
Conclusions:
- The dual-wavelength femtosecond laser-induced dewetting technique is a flexible and effective method for fabricating patterned-functional nanostructures.
- This approach offers a scalable manufacturing route for nanostructures with tailored optical responses.
- The precise control over nanostructure morphology leads to predictable and tunable optical properties.
