研究目的
Investigating the femtosecond laser ablation of silicon amidst an externally applied magnetic ?eld in different orientations with respect to the scanning direction and polarisation of the laser beam.
研究成果
The application of an external magnetic B-?eld of B ～ 0.1–0.2 T across a gap with a Si sample placed inside it strongly affects the field of ablation debris and surface morphology of ablation. The SPP mechanism can explain the observed pattern formation. Future studies will focus on observing B-?eld effects on the spatial sorting of high-refractive index nanoparticles and further examination of the SPP mechanism.
研究不足
The study was limited to the effects of externally applied magnetic fields on femtosecond laser ablation of silicon, with specific focus on debris formation and surface morphology changes. The mechanisms behind the observed phenomena, such as the SPP wave, require further examination.
1：Experimental Design and Method Selection:
Utilised ultra-short ～ 230 fs laser pulses of 1030 nm wavelengths in single and multi-pulse irradiation modes with an externally applied magnetic B-?eld Bext ≈
2：15 T. Sample Selection and Data Sources:
Standard phosphorus-doped (n-type) c-Si (cid:104)100(cid:105) was utilised for ablation.
3：List of Experimental Equipment and Materials:
Direct laser writing system, laser fabrication integrated system, high precision mechanical stages, beam pro?ling camera, 3D printed magnet and sample holding jigs, Nd2Fe14B magnets, SEM for characterisation.
4：Experimental Procedures and Operational Workflow:
Ablation conditions varied from single pulses to heavily overlapping pulses, of low and high energy, with objective lenses of numerical aperture N A =
5：14 and Data Analysis Methods:
SEM images were used to characterise surfaces of laser ablated regions.
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