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Colorizing Metals by Femtosecond Lasers (pp. 225-250) $100.00
Authors:  (Md. Shamim Ahsan, Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea and Electronics and Communication Engineering Discipline, School of Science, Engineering, and Technology, Khulna University, Khulna, Bangladesh)
Since the discovery of the first femtosecond laser in 1990s, femtosecond lasers have
been considered as a versatile tool for material processing. Metal colorizing is one of the
most promising fields among the femtosecond laser oriented application areas. A large
variety of femtosecond laser induced micro/nano-structures are found to be suitable for
metal colorizing: periodic microholes, periodic ring-shaped micropattern, laser induced
periodic surface structures (LIPSS), nanostructure-covered LIPSS (NC-LIPSS), and
Suitable control over the configuration of the micro/nano-scale features makes it
possible to adjust the optical properties of the laser-machined metal surfaces and as a
consequence, the color of the metal surfaces is altered. Both single and multi-color metal
surfaces are reported on a large variety of metal surfaces, where the surface color of the
metals depends on the patterns induced on the metal surfaces and the reflectance property
of those patterned substrates. Previously it was believed that, a particular color depends
on a particular pattern fabricated on a metal surface. However, recently it is discovered
that the same color can be produced on a metal surface by structuring a variety of patterns
induced by femtosecond laser irradiation where the optical characteristics of each color is
quite similar. Thus it is not the pattern but the optical properties those exclusively control
the surface color of the metal substrates, which can be controlled by forming various
micro/nano-structures on the metal substrates. In this chapter, we investigate briefly the
state of the art of femtosecond laser based metal colorizing techniques. 

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Colorizing Metals by Femtosecond Lasers (pp. 225-250)