研究目的
The objective of this research is to understand how to optimize LIPSSs by changing laser polarizations to obtain colorful SS. Special attention is given to the combined effects of C and H polarizations on the formation of LIPSSs on the SS surface.
研究成果
Structurally colored SS was produced by using femtosecond laser with linear and circular polarizations. The influence of laser polarization on surface properties was investigated. Circular polarization (C polarization) led to the formation of more random structures, and the resulted LIPSSs were less obvious in comparison with the linear polarization. Specimen treated with horizontally linear polarization (H polarization) had the highest surface roughness (Ra ≈ 0.042 μm). The interaction of visible light (λ = 400 nm ～ 760 nm) with LIPSSs can be used to produce structural colors. H polarization decorated SS with brighter colors in comparison with C polarization due to the formation of clearer LIPSSs. Different colors exhibited cyclically by changing view angles continuously due to different orders of the diffraction.
1：Experimental Design and Method Selection:
The experiment was performed on 304 SS specimen with a dimension of 10 mm × 10 mm × 2 mm. Mirror-like SS surfaces were prepared to minimize the influence of polishing direction on the orientation of LIPSSs. After polishing, the specimens were cleaned by acetone and ethanol, rinsed with deionized water and dried in nitrogen. Experiments were performed at room-temperature in ambient atmosphere. Laser scan irradiation mode was employed to get large and uniform surface areas for surface property tests.
2：Sample Selection and Data Sources:
Four specimens named as S1-S4 were prepared with different combinations of polarizations. Laser fluence, spot size, scan velocity and line-overlap were kept the same to minimize their influence on microstructures.
3：List of Experimental Equipment and Materials:
Optical microscope (Nikon E600W), Environmental scanning electron microscope (ESEM) (ZEISS ULTRA 55) and atomic force microscope (AFM) (PSIA XE100) were utilized to investigate the detailed morphology and microstructure of prepared specimens. Surface roughness (Ra) was tested by using roughmeter (MarSurf M300c); Color images of specimens were captured by using a camera (Canon 600D).
4：Experimental Procedures and Operational Workflow:
The laser scanning paths are shown in Figs. 1(b)–1(e). Four specimens named as S1-S4 were prepared as shown in Table
5：SS and S0 were also prepared for comparison purpose. S1-S4 were irradiated by using femtosecond laser with different combinations of polarizations. Data Analysis Methods:
The interaction of visible light with LIPSSs can be used to produce structural colors. The schematic diagram of the diffraction of light on LIPSSs is shown in Fig. 4(c).
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