Atomic-to-mesoscopic scale structural transition in metal–carbon diamondlike composites probed by second-harmonic generation

Abstract

Structural features of diamondlike metal-doped carbon films are studied by means of optical second-harmonic generation (SHG). A high interfacial sensitivity of the SHG probe and its significant enhancement in metal nanoparticles allows one to distinguish between clusterlike and amorphous atomic scale structure of carbon-metal composites. These films appear to retain a stable amorphous atomic-scale structure in a wide range of metal concentration above the percolation threshold. Atomic-to-mesoscopic scale structural transition in diamondlike metaldoped carbon films is observed, which takes place under the thermal annealing.

The characteristics of inorganic electroluminescent devices with an amorphous diamond film as cathode material

“…3(b) shows that the intensity of Raman spectra for Cr doped-DLC film is quite weak relative to the DLC film, which indicates a fairly weak bonding of graphitic phase. This is consistent with the reports of literature, that the C gradually looses its sp 3 type bonding and the DLC network steadily breaks down as the Cr content in the film increases [11][12][13]. Table 1 shows the resistivities and the sheet resistances of Al, DLC and Cr-DLC films.…”

Influence of Fe-doped on structural, electronic structural and optical properties of hydrogenated amorphous carbon films prepared by plasma enhanced chemical vapor deposition

“…This will exploit the particular advantages in many fields including electronics, optics, magnetic, and catalysis [1][2][3][4][5][6]. Moreover, many studies showed that the introduction of metallic materials into carbon matrix lowered the compressive stresses and further enhanced the adhesion of the DLC film on substrates [5,6].…”

Relative bulk and interface contributions to optical second-harmonic generation in silicon

“…Second-harmonic generation ͑SHG͒ has been widely used to study surfaces and interfaces of centrosymmetric semiconductors. [1][2][3][4] For materials with inversion symmetry SHG is electric-dipole forbidden in the bulk, which makes it particularly attractive for this purpose. To facilitate interpretation of SHG data we recently developed a simplified bondhyperpolarizability model ͑SBHM͒ that incorporates the essential physics of SHG, third-͑THG-͒, and fourth-͑FHG-͒ harmonic generation on an atomic scale.…”