Influence of substrate microcrystallinity on the orientation of laser-induced periodic surface structures

Nürnberger, Philipp; Reinhardt, Hendrik; Kim, H. C.; Yang, Fang; Peppler, K.; Janek, Jürgen; Hampp, Norbert

doi:10.1063/1.4932215

Cited by 36 publications

(24 citation statements)

References 42 publications

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“…Recent numerical simulations based on a two-temperature model quantitatively proved that a several hundreds of nanometers periodic modulation of the optical energy deposited on a 100-fs scale via linear absorption to the electronic system of a metal (titanium) can "survive" the subsequent electron-phonon-relaxation process and results in a spatially modulated lattice temperature and even localized periodic melting at the surface (Levy et al 2016). On polycrystalline metals, the visibility of the LSFL may correlate with the grain structure of the material (Sedao et al 2014) that limits the propagation of the SEWs involved in the LSFL formation (Nürnberger et al 2015).…”

Section: Theories Of Lipssmentioning

confidence: 99%

Laser-Induced Periodic Surface Structures (LIPSS)

Kirner¹,

Krüger²

2020

Handbook of Laser Micro- And Nano-Engineering

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Laser-induced periodic surface structures (LIPSS) are a universal phenomenon and can be generated on almost any material by irradiation with linearly polarized radiation. This chapter reviews the current state in the field of LIPSS, which are formed in a "self-ordered" way and are often accompanying materials processing applications. LIPSS can be produced in a single-stage process and enable surface nanostructuring and, in turn, adaption of optical, mechanical, and chemical surface properties. Typically, they feature a structural size ranging from several micrometers down to less than 100 nm and show a clear correlation with the polarization direction of the light used for their generation. Various types of

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Section: Theories Of Lipssmentioning

confidence: 99%

Laser-Induced Periodic Surface Structures (LIPSS)

Kirner¹,

Krüger²

2020

Handbook of Laser Micro- And Nano-Engineering

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“…Despite these fruitful outcomes, to the authors' knowledge, all the published FDTD approaches on LIPSSs are restricted to normal incidence and linearly polarized light [10][11][12][13][33][34][35][36][37][38][39] with only very few exceptions on nonlinearly polarized beams at normal incidence [41]. Yet, it is widely known that the incident angle is an important parameter which determines the period [42][43][44][45][46][47][48] and even the orientation of LSFLs [18]. The polarization state of the laser beam is another important parameter in controlling the orientation, local curvature, and shape of the resulting LIPSSs.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced periodic surface structures: Arbitrary angles of incidence and polarization states

2020

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We demonstrate that the finite-difference time-domain (FDTD) method can be used to study the formation of laser-induced periodic surface structures (LIPSSs) under oblique incidence and arbitrary polarization states. The inhomogeneous energy absorption below a rough surface at oblique incident angle is studied by the FDTD method and compared to the analytical efficacy theory developed by Sipe et al. [Phys. Rev. B 27, 1141 (1983)]. The two approaches show excellent agreement. The surface topographies of both low-spatial-frequency LIPSSs (LSFLs) and high-spatial-frequency LIPSSs (HSFLs) at oblique incidence and various polarization states (linear, circular, radial, and azimuthal) are simulated by taking into account topography-driven interpulse feedback effects. For sand mixed sand p-polarized beams at large incident angles, the simulated LSFLs show orientations that are neither perpendicular nor parallel to the laser polarization. Their physical origin is explained by a nonzero angle between the in-plane wave vector of the incident light and the scattered light. By using circularly-polarized beams, the simulated surface topographies are further shown to be in excellent agreement with the triangular LSFLs and the fine-dot nanoscaled structures reported in the literature. In addition, the simulation of HSFLs suggests that their periods have almost no dependence on the incident angle nor the polarization angle, while their surface topographies resemble that of blazed gratings at large incident angles for p-polarized and mixed sand p-polarized beams. The origin is explained by the appearance of asymmetry in the scattered near-field light. The extension to oblique incidence and arbitrary polarization states demonstrates that the FDTD approach on LIPSSs is a highly versatile and powerful technique which has the potential to be one of the foundations for a complete modeling and understanding of LIPSSs under various irradiation conditions.

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“…Despite the importance of , there are surprisingly few works on systematic studies of this parameter, and these works are limited to a very narrow selection of materials. 2,[22][23][24][25] For the specific case of metals, the wave propagating at the surface that contributes to ripple formation is generally identified as a surface plasmon polariton [26][27][28][29] coupled in from the incident light with help from a non-negligible surface roughness. The role of surface roughness is thus to impart momentum to the incident wave, bridging the momentum mismatch between the parallel component of the wavevector of such incident wave with that of the SPP, which lies beyond the light cone.…”

Section: Introductionmentioning

confidence: 99%

Surface Plasmon Polaritons on Rough Metal Surfaces: Role in the Formation of Laser-Induced Periodic Surface Structures

et al. 2019

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The formation of self-organized laser induced periodic surface structures (LIPSS) in metals, semiconductors and dielectrics upon pulsed laser irradiation is a well-known phenomenon, receiving increased attention due to its huge technological potential. For the case of metals, a major role in this process is played by surface plasmon polaritons (SPPs) propagating at the interface of the metal with the medium of incidence. Yet, simple and advanced models based on SPP propagation sometimes fail to explain experimental results, even of basic features as the LIPSS period. We experimentally demonstrate, for the particular case of LIPSS on Cu, that significant deviations of the structure period from the predictions of the standard model are observed, which are very pronounced for elevated angles of laser incidence. In order to explain this deviation, we introduce a model based on the propagation of a SPP on a rough surface that takes into account the influence of the specific roughness properties on the SPP wave vector. Good agreement of the modelling results with the experimental data is observed, which highlights the potential of this model for the general understanding of LIPSS in other metals.

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Influence of substrate microcrystallinity on the orientation of laser-induced periodic surface structures

Cited by 36 publications

References 42 publications

Laser-Induced Periodic Surface Structures (LIPSS)

Laser-Induced Periodic Surface Structures (LIPSS)

Laser-induced periodic surface structures: Arbitrary angles of incidence and polarization states

Surface Plasmon Polaritons on Rough Metal Surfaces: Role in the Formation of Laser-Induced Periodic Surface Structures

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