Ultrashort period laser induced periodic surface structures
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Ultrashort period laser induced periodic surface structures

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Published by National Library of Canada = Bibliothèque nationale du Canada in Ottawa .
Written in English


Book details:

Edition Notes

SeriesCanadian theses = Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches.
ID Numbers
Open LibraryOL16499527M
ISBN 100315583061
OCLC/WorldCa30971427

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  Laser-induced periodic surface structures are parallel periodic lines formed in a self-ordered way on the surface of a laser irradiated material. It is important to note that each individual line is not produced by laser scanning the surface, but it is rather a global phenomenon that simultaneously produces several parallel lines per irradiated Cited by: 5.   Exposure of metal surfaces to multiple ultrashort laser pulses under certain conditions leads to the formation of well-defined periodic surface structures. We show how the period of such structures in steel can be tuned over a wide range by controlling the complex interaction mechanisms triggered in the by: 8.   The know-how of periodic nanostructuring at tens of nanometers scale is crucial for surface engineering, and the understanding of the physical mechanism underlying it remains of fundamental importance. The fact that ultrafast laser irradiation enables formation of nanostructures with dimensions far below the diffraction limit questions the triggering events. Optically, local near-field Cited by:   Exposure of metal surfaces to multiple ultrashort laser pulses under certain conditions leads to the formation of well-defined periodic surface structures. We show how the period of such structures in steel can be tuned over a wide range by controlling the complex interaction mechanisms triggered in the material. Amongst the different irradiation parameters that influence the properties of .

2. I. INTRODUCTION. The formation of laser-induced periodic surface structures (LIPSS, often termed “ripples”) has gained remarkable attraction during the past years, partly triggered by the. Laser-induced periodic surface structures (LIPSS) are a universal phenomenon observed in all classes of solid materials, giving rise to a variety of self-assembled subwavelength structures with different symmetries. These promising features have opened new opportunities for laser structuring of materials in a wide range of applications, including plasmonics, nanophotonics, nanoelectronics.   The formation of laser-induced periodic surface structures (LIPSS) has been investigated extensively in the last few decades. Formation of LIPSS, or more precisely ripples, was observed in different materials (metals [10], semiconductors [11], and polymers [12]) by irradiation with a wide variety of laser parameters, e.g. pulse duration (CW.   In this paper, we performed a detailed study of the formation of femtosecond laser-induced periodic surface structures (LIPSSs) on platinum and gold at near-damage threshold fluences. We find a unique type of LIPSS entirely covered with nanostructures. A distinctive feature of the nanostructure-covered LIPSS is that its period is appreciably less than that of the regular LIPSS.

Especially, ultrashort pulsed laser processing can induce the for-mation of periodic ripples, which are known as laser-induced periodic surface structures (LIPSS).[23,24] When created with polarized laser radiation, these ripples can have a periodicity close to the laser wavelength and are generally oriented orthogo-nally to the polarization.   The formation of laser-induced periodic surface structures (LIPSS or ripples) on the surface of condensed materials (metals, semiconductors, insulators) under laser illumination is a universal phenomenon that spontaneously arises whenever the intensity of laser . Over the last few years, ultrashort laser pulses have proven Periodic surface structures induced by femtosecond laser single pulse and pulse trains on metals Jun Xie1, Feng Wang 1, Lan Jiang, period on the laser pulse number for various laser energy flu-ences. The periods of the ripples were measured by reading. We investigated sub-wavelength structures, so-called nanogratings, induced by ultrashort laser pulses in the bulk of transparent materials. By using small angle x-ray scattering and focused ion beam milling we were able to show that nanogratings consist of sheet-like cavities with dimensions of ( × 25 × ) nm 3 and (30 × 25 × 75) nm size remains constant with an increasing.