Light absorption by surface nanoholes and nanobumps

Rudenko, Anton; Mauclair, Cyril; Garrelie, Florence; Stoian, Razvan; Colombier, Jean‐Philippe

doi:10.1016/j.apsusc.2018.11.111

Cited by 49 publications

(68 citation statements)

References 42 publications

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“…Rough surfaces augment the light absorbance and maximize the energy utilization by minimizing the reflection. A similar fact regarding light absorbance can be found in a study conducted by Rudenko et al [ 51 ] wherein nanobumps present on the initial substrate surface are favorable to maximize the absorption of laser irradiation. This is the reason that polished surfaces or reflective materials (such as silver, copper, gold, and aluminum), as stated by Naeem [ 52 ], are difficult to machine by laser machining.…”

Section: Methodssupporting

confidence: 74%

Achieving the Minimum Roughness of Laser Milled Micro-Impressions on Ti 6Al 4V, Inconel 718, and Duralumin

et al. 2020

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Titanium-aluminium-vanadium (Ti 6Al 4V) alloys, nickel alloys (Inconel 718), and duraluminum alloys (AA 2000 series) are widely used materials in numerous engineering applications wherein machined features are required to having good surface finish. In this research, micro-impressions of 12 µm depth are milled on these materials though laser milling. Response surface methodology based design of experiment is followed resulting in 54 experiments per work material. Five laser parameters are considered naming lamp current intensity (I), pulse frequency (f), scanning speed (V), layer thickness (LT), and track displacement (TD). Process performance is evaluated and compared in terms of surface roughness through several statistical and microscopic analysis. The significance, strength, and direction of each of the five laser parametric effects are deeply investigated for the said alloys. Optimized laser parameters are proposed to achieve minimum surface roughness. For the optimized combination of laser parameters to achieve minimum surface roughness (Ra) in the titanium alloy, the said alloy consists of I = 85%, f = 20 kHz, V = 250 mm/s, TD = 11 µm, and LT = 3 µm. Similarly, optimized parameters for nickel alloy are as follows: I = 85%, f = 20 kHz, V = 256 mm/s, TD = 8 µm, and LT = 1 µm. Minimum roughness (Ra) on the surface of aluminum alloys can be achieved under the following optimized parameters: I = 75%, f = 20 kHz, V = 200 mm/s, TD = 12 µm, and LT = 3 µm. Micro-impressions produced under optimized parameters have surface roughness of 0.56 µm, 2.46 µm, and 0.54 µm on titanium alloy, nickel alloy, and duralumin, respectively. Some engineering applications need to have high surface roughness (e.g., in case of biomedical implants) or some desired level of roughness. Therefore, validated statistical models are presented to estimate the desired level of roughness against any laser parametric settings.

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Section: Methodssupporting

confidence: 74%

Achieving the Minimum Roughness of Laser Milled Micro-Impressions on Ti 6Al 4V, Inconel 718, and Duralumin

et al. 2020

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“…Note that the depth at which the LSFL-II are formed in dielectrics is located in the radiative intermediate region that is separating the regimes of nonradiative near-field scattering [r < /(2 )] and radiative far-field scattering [r > 2 ]. [89] That scenario is illustrated in the collage presented in , and (e)-where the co-existing spatial signatures of the LSFL-II and HSFL-I are evident. Their orthogonal orientation is finally a consequence of the spatial scattering characteristics of sub-wavelength surface defects along with the optical properties of the irradiated material (dielectric vs metallic, see Fig.…”

Section: Finite-difference Time-domain (Fdtd) Simulationsmentioning

confidence: 93%

Maxwell Meets Marangoni—A Review of Theories on Laser‐Induced Periodic Surface Structures

Bonse

Gräf

2020

Laser & Photonics Reviews

331

246

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Surface nanostructuring enables the manipulation of many essential surface properties. With the recent rapid advancements in laser technology, a contactless large-area processing at rates of up to m 2 s −1 becomes feasible that allows new industrial applications in medicine, optics, tribology, biology, etc. On the other hand, the last two decades enable extremely successful and intense research in the field of so-called laser-induced periodic surface structures (LIPSS, ripples). Different types of these structures featuring periods of hundreds of nanometers only-far beyond the optical diffraction limit-up to several micrometers are easily manufactured in a single-step process and can be widely controlled by a proper choice of the laser processing conditions. From a theoretical point of view, however, a vivid and very controversial debate emerges, whether LIPSS originate from electromagnetic effects or are caused by matter reorganization. This article aims to close a gap in the available literature on LIPSS by reviewing the currently existent theories of LIPSS along with their numerical implementations and by providing a comparison and critical assessment of these approaches.

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“…To overcome theses limitations, a numerical approach [10][11][12][13][33][34][35][36][37][38] adopting the finite-difference time-domain (FDTD) method was developed within the last decade to simulate the formation of LIPSSs. The main advantages of the FDTD approach over the pioneering efficacy theory are the flexibility to model light-matter interactions for any geometries directly from Maxwell's equations, a natural and straightforward incorporation of both topography-driven interpulse feedback effect [11,12,35], and intra-pulse feedback of permittivity dynamics [13,33,34]. The FDTD approach has shown great potential and success in unravelling the origin of many types of LIPSSs including HSFLs.…”

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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Light absorption by surface nanoholes and nanobumps

Cited by 49 publications

References 42 publications

Achieving the Minimum Roughness of Laser Milled Micro-Impressions on Ti 6Al 4V, Inconel 718, and Duralumin

Achieving the Minimum Roughness of Laser Milled Micro-Impressions on Ti 6Al 4V, Inconel 718, and Duralumin

Maxwell Meets Marangoni—A Review of Theories on Laser‐Induced Periodic Surface Structures

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

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