Effects of laser irradiation on the morphology of Cu(110)

Abstract

The effects of pulsed laser irradiation on the morphology of the Cu͑110͒ surface were investigated by means of reflectance difference spectroscopy ͑RDS͒ and spot profile analysis low-energy electron diffraction ͑SPA-LEED͒. The laser light induces surface defects ͑adatoms and islands͒ as well as subsurface dislocation lines. The high surface mobility leads to efficient annealing of the surface defects even at room temperature, whereas the subsurface dislocation lines persist up to temperatures T Ͼ 800 K. SPA-LEED profiles of the ͑00͒ diffraction spot from the laser irradiated surface suggest an anisotropic distribution of the subsurface line defects related to the geometry of the fcc easy glide system, which is corroborated by STM measurements. Comparative experiments using conventional Ar ion bombardment point out the distinctiveness of the morphological changes induced by laser irradiation.

Properties of oxide thin films and their adsorption behavior studied by scanning tunneling microscopy and conductance spectroscopy

“…38 Especially at high temperatures, the adsorption might initiate a substantial mass transport on the surface, inducing the formation of a completely new surface morphology. 39 This review clearly adopts the static picture, as low-temperature scanning tunneling microscopy (STM) as the major experimental technique employed here has undisputed strengths in the exploration of stationary surface configurations. optical methods and force microscopy are in principle suited to deal with bulk insulators, while most electron-based techniques face severe charging problems.…”

Tailoring periodic nanostructures of vicinal copper surfaces: Formation and evolution of oxygen-induced faceting on Cu(332)

“…In this case, the tuneability of the long range nanostructures has been described through the change of the elastic properties, where the presence of the absorbate acts as a trigger to produce faceting. In a similar system, Brandstetter et al [17] were able to vary the distribution of the terrace width in Cu(19 19 1) (vicinal of Cu(1 1 0)), through oxygen exposure. In this case, the formation of Cu-O stripes perpendicular to the steps edges on the Cu(1 1 0) terraces leads to the extension or certain terraces at the expense of neighbouring ones.…”

“…Such surfaces present periodic local fields (stresses, special atomic sites at step edges and kinks) [3][4][5], often inducing selective sticking or reactivity to atomic and/or molecular adsorbates [6][7][8][9]. The faceting reconstruction of a vicinal surface, although not commonly observed in clean surfaces [2,10], can be induced by a specific adsorbate [11][12][13][14][15][16][17][18], thus representing a viable pathway to the goal of periodic nanostructures with tailored properties.…”

“…The process is ruled by the mobility of the surface atoms and it is strongly dependent upon the exposure and annealing temperature, i.e. the surface kinetics [17].…”

Paraxial propagation in amorphous optical media with screw dislocation

“…Such dislocations can be induced by the focused beam itself (see e.g. [28,29]). The study of beam transport provides an indirect way to determine the dislocations as well as the elasto-optical properties of the medium.…”