Self-organized pattern formation upon femtosecond laser ablation by circularly polarized light

Insight into electronic mechanisms of nanosecond-laser ablation of silicon

“…They demonstrate, however, a variety of physical effects that have not been fully understood. There are still debates about ultrafast melting, 1-5 resolidification dynamics, [6][7][8] surface structure modification, 9,10 thermal and nonthermal mechanisms of ablation, 6,[11][12][13][14][15][16][17][18] and direct cluster emission. 16,[19][20][21] This stimulates extensive studies, both experimental and theoretical, of the dynamics of laser heating, melting, resolidification, and ablation of silicon under laser irradiation with different pulse durations and laser wavelengths.…”

Nanosecond pulsed laser induced self-organized nano-dots patterns on GaSb surface

“…The nanostructures using some beam processes such as electron [1,2], ion [3,4], molecular [5][6][7][8][9] and laser [10][11][12][13][14][15][16][17][18] was reported by their experimental observations. In particularly, a pulsed laser irradiation has been also achieved surface damage pattern at nanoscale on material surface with a wavelength-dependent periodicity by the interference of laser lights [19][20][21][22][23][24][25][26].…”

In situ observation of self-organizing nanodot formation under nanosecond-pulsed laser irradiation on Si surface

“…b͒ originating from surface instabilities caused by two competing processes, namely, surface roughening due to explosion and surface smoothing due to self-diffusion. 13,27 Moreover, Romer et al 29 were unable to account for their results of subwavelength "pre-ripple" formation, which is initiated with irregular lines and with an orientation different from that of the "regular ripples" of conventional-LIPSS induced by a number of fs-laser pulses irradiated on the surfaces of alloys, using the four previous major models in the literature. They suggested a combination of the existing models including the above-mentioned models.…”

“…13,[23][24][25][26][27][28][29] It has been well known that when a linearly polarized laser beam impinges on a material at normal incidence, the fringe pattern of conventional-LIPSS appears in the form of parallel, periodic ripple lines with an incident light wavelength separation, irrespective of the surface crystallographic orientation, and most of the damage patterns are very similar and independent of material properties, regardless of whether the material is a metal or a semiconductor. 19 It is now generally accepted that conventional-LIPSS is formed by the interference between the incident laser light and the scattered waves on the surface, 21,22 which may include recent laser induced waves, such as electron plasma, 25 Coulomb explosion 30 or surface plasmons, 31 as an extension of the interference model for subwavelength ͑or high-spatialfrequency͒ LIPSS bifurcations.…”

“…1-3 Well-known examples include the self-organization of lattice-defect structures induced in materials by the irradiation of energetic beams of electrons, 4 neutrons, 5,6 ions, [7][8][9] and lasers. [10][11][12][13][14] Of these, the formations of ordered dots and ripple structures on the surfaces of semiconductors by low-energy ion irradiation or by pulsed laser irradiation have attracted attention among researchers because of their potential industrial applications. For example, the two-dimensionally ordered nanodots formed on a GaSb surface by ion sputtering yield a blueshift in the photoluminescence spectrum, which is attributed to quantum confinement in the dots, and such dot-formed devices are expected to find applications in electro-optical quantum devices.…”