6533b836fe1ef96bd12a1bff
RESEARCH PRODUCT
Diffraction-efficiency oscillations in amorphous As_2S_3 films
Nina NordmanOlli NordmanAndris Ozolssubject
Materials scienceCondensed matter physicsHolographic gratingbusiness.industryBand gapHolographyStatistical and Nonlinear PhysicsDiffraction efficiencyPolarization (waves)Atomic and Molecular Physics and OpticsAmorphous solidlaw.inventionlawOptoelectronicsbusinessAnisotropyDiffraction gratingdescription
An experimental study of the holographic gratings recorded in nonannealed, thermally with time relaxed amorphous As2S3 films by 514.5-nm light in the presence of 632.8-nm readout light is carried out. The dependences of the maximal first-order diffraction efficiency on the holographic grating period was studied in a wide range of periods, from 0.40 to 70.0 µm. A peculiar oscillatory diffraction-efficiency temporal behavior occurring under certain conditions is reported. 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 diffraction-efficiency oscillations are explained by the model of annihilating defects and by multiwave mixing in a thin dynamic hologram.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-04-01 | Journal of the Optical Society of America B |