研究目的
Investigating the fabrication of polarization modifying devices using femtosecond laser-induced periodic surface structures (LIPSS) on metallic surfaces.
研究成果
The study demonstrates the fast fabrication of LIPSS on stainless steel with a setup based on cylindrical lens, showing their potential application as reflective waveplates. The optical behavior can be modified by changing LIPSS morphology in the fabrication process, supported by computational modeling. However, further improvements are needed for high reflectivity and specific changes in polarization for real operational waveplates.
研究不足
The study is limited to stainless steel samples and a specific range of processing speeds (0.8 to 2.4 mm/s). The optical behavior of the devices is not optimal for all applications, requiring further improvements for real-life operation.
1：Experimental Design and Method Selection:
A Ti:Sapphire femtosecond laser with a cylindrical focusing system was used to generate LIPSS on stainless steel samples. The setup included a combination of a cylindrical lens and a spherical focusing lens to focus the beam on the sample with a line-shaped profile.
2：Sample Selection and Data Sources:
Stainless steel (AISI 304) samples were mechanically polished and cleaned before and after processing.
3：List of Experimental Equipment and Materials:
Ti:Sapphire laser, cylindrical lens, spherical focusing lens, motorized stages, CMOS camera, SEM, AFM, FIB, EDS, polarimeter, He-Ne laser.
4：Experimental Procedures and Operational Workflow:
LIPSS patterns were generated by moving the sample under the line-focused laser beam at constant speeds. The morphology and optical response of the fabricated samples were characterized.
5：Data Analysis Methods:
SEM and AFM for morphological characterization, polarimeter for optical characterization, and RCWA for numerical simulations.
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