Abstract
In this paper, the investigation of laser-induced periodic surface structures (LIPSSs) on a polycrystalline diamond substrate using synthetic optical holography (SOH) is demonstrated. While many techniques for LIPSS detection operate with sample contact and/or require preparation or processing of the sample, this novel technique operates entirely non-invasively without any processing of or contact with the LIPSS sample at all. The setup provides holographic amplitude and phase images of the investigated sample with confocally enhanced and diffraction-limited lateral resolution, as well as three-dimensional surface topography images of the periodic structures via phase reconstruction with one single-layer scan only.
Highlights
Investigation of Laser-InducedLaser-induced periodic surface structures (LIPSSs) are periodic patterns formed on surfaces of different materialsexposed to laser radiation
We present a new all-optical, non-invasive method for three-dimensional visualization of laser-induced periodic surface structures (LIPSSs) patterns exploiting the benefits of digital holographic microscopy (DHM)
The LIPSS sample was investigated with our synthetic optical holographic microscope, showing the parallel periodic surface structures of the sample
Summary
They were discovered by Birnbaum in 1965 [4], who observed the periodic damage pattern induced by a ruby laser on a semiconductor with a conventional optical microscope. These three-dimensional surface patterns are used to functionalize surfaces for a number of applications. Since the period of the emerging patterns is usually less than the wavelength of the laser light, the application of either high-resolution optical microscopes or other surface visualization techniques with sub-micrometer resolution is mandatory
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