期刊
APPLIED SURFACE SCIENCE
卷 258, 期 19, 页码 7625-7632出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.04.105
关键词
Femtosecond laser pulses; Ripples; Structural colors
类别
资金
- National Natural Science Foundation of China [10974060, 11111120068]
- project for high-level professionals in the universities of Guangdong province, China
Ripples with a subwavelength period were induced on the surface of a stainless steel (301 L) foil by femtosecond laser pulses. By optimizing the irradiation fluence of the laser pulses and the scanning speed of the laser beam, ripples with large amplitude (similar to 150 nm) and uniform period could be obtained, rendering vivid structural colors when illuminating the surface with white light. It indicates that these ripples act as a surface grating that diffracts light efficiently. The strong dependence of the ripple orientation on the polarization of laser light offers us the opportunity of decorating different regions of the surface with different types of ripples. As a result, different patterns can be selectively displayed with structural color when white light is irradiated on the surface from different directions. More interestingly, we demonstrated the possibility of decorating the same region with two or more types of ripples with different orientations. In this way, different patterns with spatial overlapping can be selectively displayed with structural color. This technique may find applications in the fields of anti-counterfeiting, color display, decoration, encryption and optical data storage. (C) 2012 Elsevier B.V. All rights reserved.
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