Holographic manifestations of D centres in amorphous As2S3 films

• Published in: Radiation effects and defects in solids Vol. 150; no. 1-4; pp. 369 - 374
• Main Authors: Ozols, A., Nordman, O., Nordman, N.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.01.1999
• Subjects: Amorphous chalcogenide films; D centres; Holography; Photoinduced anisotropy; Photoinduced structural changes
• ISSN: 1042-0150; 1029-4953
• DOI: 10.1080/10420159908226259

The concept of D centres introduced by N. F. Mott, E. A. Davis and R. A. Street for chalcogenide glasses is used to explain three holographic effects in amorphous As 2 S 3 films experimentally observed by authors at room temperature. These three effects include subbandgap light holographic recording (previously assumed to be impossible), strong stimulation of bandgap light holographic recording by subbandgap readout light, and diffraction efficiency oscillations at low recording intensities in the presence of subbandgap readout light. The first and the second effects are found to be due to the subbandgap light induced reorientation and generation of D − and D + centres whereas the third effect is explained by the subbandgap light stimulated D centre diffusion. The phenomenon of photoinduced anisotropy involved in the first two effects is analysed, too.