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Rotationally symmetric colorization of metal surfaces through omnidirectional femtosecond laser-induced periodic surface structures

Taek Yong Hwang, Heedeuk Shin, Hai Joong Lee, Hyo Soo Lee, Chunlei Guo, and Byounghwak Lee

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Abstract

Following femtosecond (fs) laser pulse irradiation, the formation of a new type of low-spatial-frequency laser-induced periodic surface structure (LSFL) patterns, namely, omnidirectional LSFLs (OD-LSFLs) with the periodic ordering of their orientations, are investigated on Ni in this Letter. Using a liquid crystal polymer patterned depolarizer, we periodically rotate the polarization of fs laser pulses across the laser spot and create OD-LSFLs by raster scanning fs laser pulses. We also show that the period of the OD-LSFL orientation rotation can be controlled with the defocused distance, and OD-LSFLs can significantly expand the viewing angle of the structural colors in the azimuthal direction without noticeable color degradations.

© 2020 Optical Society of America

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Supplementary Material (1)

NameDescription
Visualization 1       Detail measurements of diffraction from LSFLs with a single orientation and OD-LSFLs shown in Fig. 6

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