The origin of stretched exponential function in dynamic response of photodarkening in amorphous chalcogenides
2009; American Institute of Physics; Volume: 95; Issue: 5 Linguagem: Inglês
10.1063/1.3197631
ISSN1520-8842
AutoresK. Shimakawa, N. Nakagawa, Toshiya Itoh,
Tópico(s)Liquid Crystal Research Advancements
ResumoAn increase in the optical absorption coefficient during illumination [photodarkening (PD)] is known to be described by a stretched exponential function (SEF) 1−exp[−(t/τ)β], where τ and β, respectively, are the effective response time and the dispersion parameter. τ and β deduced experimentally depend on the thickness of films. A model calculation, assuming a series sequence of PD along the thickness direction from the illuminated surface to the back surface, produces the SEF and replicates well the experimental results.
Referência(s)