Abstract
Surface relief gratings produced on a surface of amorphous chalcogenide films As20Se80 are flatten at room temperature under illumination by a near-bandgap polarized light (λ = 650 nm). The rates of the profiles flattening are dependent on the light intensity, polarization direction, and grating period. Two possible flattening mechanisms are selected: viscous flow and volume diffusion, and the flattening rates are calculated for both of them. From the comparison of the theory with the experiments, it is concluded that the process is controlled by anisotropic volume diffusion. The effective photo-induced diffusion coefficients, Dxx, along E-vector of the light polarization, obtained from the flattening kinetics are proportional to the light intensity (Dxx = βxI) with βx = 2.5 × 10- 18 m4/J. The diffusion coefficients Dyy along perpendicular direction are four times smaller, independently of the light intensity.
| Original language | English |
|---|---|
| Pages (from-to) | 159-161 |
| Number of pages | 3 |
| Journal | Materials Letters |
| Volume | 66 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Jan 2012 |
Bibliographical note
Funding Information:This work was supported by the grant CK80126 of the Hungarian Scientific Research Fund and by the TAMOP 4.2.1./B-09/1/KONV-2010-007 project, which is co-financed by the European Union and European Social Fund .
Funding
This work was supported by the grant CK80126 of the Hungarian Scientific Research Fund and by the TAMOP 4.2.1./B-09/1/KONV-2010-007 project, which is co-financed by the European Union and European Social Fund .
| Funders | Funder number |
|---|---|
| European Commission | |
| Hungarian Scientific Research Fund | |
| European Social Fund |
Keywords
- AsSe
- Diffusion
- Gratings
- Kinetics
- Surface
- Thin films