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Direct Femtosecond Laser Surface Structuring with Optical Vortex Beams Generated by a q-plate
Jijil J J Nivas1,2, Shutong He1,3, Andrea Rubano1,2
1Dipartimento di Fisica, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli, Italy.
Scientific Reports
|December 15, 2015
Summary
Femtosecond laser structuring using optical vortex beams creates diverse surface patterns on silicon. This method precisely controls micro- and nano-scale structures by manipulating light
Area of Science:
- Materials Science
- Optics and Photonics
- Nanotechnology
Background:
- Micro- and nano-scale surface structuring is crucial for advanced materials and devices.
- Femtosecond laser surface structuring with Gaussian beams is a known fabrication method.
- Optical vortex beams offer unique polarization properties for advanced material processing.
Purpose of the Study:
- To explore femtosecond laser surface structuring using optical vortex beams.
- To demonstrate the fabrication of regular surface patterns on silicon.
- To correlate surface structure features with optical vortex beam polarization.
Main Methods:
- Generation of optical vortex beams with orbital angular momentum (ℓ=±1) using a q-plate.
- Direct femtosecond laser surface structuring of silicon substrates.
- Analysis of surface structures using scattered surface wave theory.
Main Results:
- Fabrication of various regular surface patterns (rippled and grooved) on silicon.
- Demonstrated correlation between surface structure morphology and beam polarization state.
- Rationalized the dependence of structures on laser beam characteristics (polarization, fluence).
Conclusions:
- Femtosecond optical vortex beams provide a versatile tool for precise surface structuring.
- The polarization state of optical vortex beams dictates the resulting surface patterns.
- This approach enables the creation of complex micro- and nano-scale surface features.
