6533b871fe1ef96bd12d22bf
RESEARCH PRODUCT
Two-color holographic-grating formation in amorphous As_2S_3 films
Nina NordmanAndris OzolsOlli Nordmansubject
Materials scienceHolographic gratingbusiness.industryBand gapHolographyStatistical and Nonlinear PhysicsDiffraction efficiencyAtomic and Molecular Physics and Opticslaw.inventionAmorphous solidLight intensitylawAttenuation coefficientOptoelectronicsbusinessAnisotropydescription
A detailed experimental study of the holographic gratings recorded in nonannealed amorphous As2S3 films by 514.5-nm light in the presence of 632.8-nm readout light is carried out. A strong influence of a continuous 632.8-nm readout is found. The dependences of the maximal first-order diffraction efficiency and the corresponding specific recording energy on the holographic grating period were studied in a wide range of periods from 0.40 to 70.0 μm for 2-yr-old films. The obtained results are discussed in terms of photoinduced structural changes, relaxational structural changes, photoinduced anisotropy, and photoinduced recharging of the localized states in the bandgap. The photoinduced sulphur related D-- and D+-center orientation mechanism is proposed to explain the stimulating action of 632.8-nm light.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-09-01 | Journal of the Optical Society of America B |