Redistribution of a material at femtosecond laser ablation of a thin silver film

Данилов, П. А.; Zayarny, D. A.; Ионин, А. А.; Kudryashov, S. I.; Rudenko, A. A.; Kuchmizhak, A. A.; Vitrik, Oleg B.; Kulchin, Yu. N.; Zhakhovsky, V. V.; Inogamov, N. A.

doi:10.1134/s0021364016230077

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…The experimental as well as the simulation results show that in addition to the laser induced upward motion of material, a lateral displacement of material plays an important role in the structure formation process. This observation is in agreement with a recent experimental and theoretical work on redistribution of the processed material volume during the femtosecond laser processing [ 51 ]. In contrast to material irradiation by a single focused beam to a small spot where the material can expand freely in lateral directions, in the case of a periodic lateral pattern, the material expulsions from neighboring grooves at high fluence affect each other.…”

Section: Resultssupporting

confidence: 93%

“…Instead, the formation of voids, as a predecessor of the surface layer spallation, originates from the relaxation of the laser-induced stress accumulation resulting from the fast heating under the constant volume of the irradiated target. Not only this relaxation drives the already melted matter into the hydrodynamical motion upward, but also results in a mechanical rupture of the subsurface layer (spallation) in the area where the lattice temperature and pressure are high enough [ 16 , 18 , 32 , 49 , 51 , 52 ]. This mechanism allows for generation of arrays of subsurface voids of specific size for their technological applications [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

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Formation of Periodic Nanoridge Patterns by Ultrashort Single Pulse UV Laser Irradiation of Gold

et al. 2020

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A direct comparison of simulation and experimental results of UV laser-induced surface nanostructuring of gold is presented. Theoretical simulations and experiments are performed on an identical spatial scale. The experimental results have been obtained by using a laser wavelength of 248 nm and a pulse length of 1.6 ps. A mask projection setup is applied to generate a spatially periodic intensity profile on a gold surface with a sinusoidal shape and periods of 270 nm, 350 nm, and 500 nm. The formation of structures at the surface upon single pulse irradiation is analyzed by scanning and transmission electron microscopy (SEM and TEM). For the simulations, a hybrid atomistic-continuum model capable of capturing the essential mechanisms responsible for the nanostructuring process is used to model the interaction of the laser pulse with the gold target and the subsequent time evolution of the system. The formation of narrow ridges composed of two colliding side walls is found in the simulation as well as in the experiment and the structures generated as a result of the material processing are categorized depending on the range of applied fluencies and periodicities.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Formation of Periodic Nanoridge Patterns by Ultrashort Single Pulse UV Laser Irradiation of Gold

et al. 2020

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“…At present, it is not clear which physical properties are the key parameters to govern the process. Here, molecular dynamic simulation will be a powerful tool to investigate the underlying mechanisms and key parameters [ 32 ]. There is still the possibility of achieving an array structure and uniform size distribution of the Pt nanodots by optimizing the parameters, and further experiments are needed.…”

Section: Resultsmentioning

confidence: 99%

Laser-Induced Transfer of Noble Metal Nanodots with Femtosecond Laser-Interference Processing

et al. 2021

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Noble metal nanodots have been applied to plasmonic devices, catalysts, and highly sensitive detection in bioinstruments. We have been studying the fabrications of them through a laser-induced dot transfer (LIDT) technique, a type of laser-induced forward transfer (LIFT), in which nanodots several hundred nm in diameter are produced via a solid–liquid–solid (SLS) mechanism. In the previous study, an interference laser processing technique was applied to LIDT, and aligned Au nanodots were successfully deposited onto an acceptor substrate in a single shot of femtosecond laser irradiation. In the present experiment, Pt thin film was applied to this technique, and the deposited nanodots were measured by scanning electron microscopy (SEM) and compared with the Au nanodots. A typical nanodot had a roundness fr=0.98 and circularity fcirc=0.90. Compared to the previous experiment using Au thin film, the size distribution was more diffuse, and it was difficult to see the periodic alignment of the nanodots in the parameter range of this experiment. This method is promising as a method for producing large quantities of Pt particles with diameters of several hundred nm.

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“…True two-loop amplitudes has been obtained in [6]. Arbitrary-loop amplitudes have been obtained in [7].Alternatively, the supercovariant gauge [8,9,10,11,12] is employed where the zweibein and 2D-gravitino field are conformally flat. In this case local spinning string amplitudes have a manifest symmetry under SL(2) and supermodular transformations.…”

mentioning

confidence: 99%

“…The string world sheet is specified as the (1|1) , non-split supermanifold. The supermanifold carries a "superspin" structure [11,12,13,15] instead of the spin structure [3]. The superstring amplitude is obtained by a summation over the superspin structures.…”

mentioning

confidence: 99%

Calculation of multi-loop superstring amplitudes

Danilov¹

2016

Class. Quantum Grav.

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The multi-loop interaction amplitudes in the theory of the closed, oriented superstrings are obtained by the integration of local amplitudes. The superstring local amplitude is represented by a sum of the spinning string local amplitudes. The spinning string local amplitudes are given explicitly through super-Schottky group parameters and interaction vertex coordinates on the (1|1) complex supermanifold. The super-Schottky group is a supersymmetrical extension of the Schottky group. The integration is ambiguous with respect to those replacements of the integration variables which admix Grassmann variables to the boson ones. So the calculation is guided by a preservation of local symmetries of the superstring. The superstring amplitudes are free from divergences and they are consistent with the world-sheet spinning string symmetries. The vacuum amplitude vanishes along with 1-, 2-and 3-point amplitudes of massless states. The vanishing of the vacuum amplitude occurs after the integration of the corresponding local amplitude is performed over those modular variables that are limiting points of the super-Schottky group. The above-mentioned massless state amplitudes are nullified afterwards the corresponding local amplitudes are, in addition, integrated over the interaction vertex coordinates.

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Redistribution of a material at femtosecond laser ablation of a thin silver film

Cited by 12 publications

References 23 publications

Formation of Periodic Nanoridge Patterns by Ultrashort Single Pulse UV Laser Irradiation of Gold

Formation of Periodic Nanoridge Patterns by Ultrashort Single Pulse UV Laser Irradiation of Gold

Laser-Induced Transfer of Noble Metal Nanodots with Femtosecond Laser-Interference Processing

Calculation of multi-loop superstring amplitudes

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