Title :
Optical hysteresis and light absorption in a-As2S3 and c-As2S3
Author :
Chumash, Valentin ; Bostan, G. ; Cojocaru, Ion ; Mincu, Niculae ; Cerbari, Pavel
Author_Institution :
Inst. of Appl. Phys., Acad. of Sci., Kishinev, Moldova
Abstract :
Results of the experimental investigations of nonlinear absorption of laser pulses in amorphous a-As2S3 films are presented. The optical transmission hysteresis and reversible film photodarkening at interband excitation of a-As2S3 films in a blue-green spectral region is reported for the first time. It was suggested that the nonlinear light absorption could be explained by taking into account the light interaction with nonequilibrium localized lattice vibrations anharmonically coupled with the extended phonons. The measurements of peculiarities of the pulse absorption in crystalline c-As2S3 films can confirm the proposed explanation
Keywords :
amorphous semiconductors; arsenic compounds; hysteresis; light transmission; localised modes; optical films; optical saturable absorption; photochromism; polaritons; semiconductor materials; semiconductor thin films; As2S3; a-As2S3 films; anharmonically coupled extended phonons; blue-green spectral region; c-As2S3 films; interband excitation; nonequilibrium localized lattice vibrations; nonlinear light absorption; optical transmission hysteresis; reversible film photodarkening; Absorption; Amorphous materials; Hysteresis; Laser excitation; Lattices; Nonlinear optics; Optical films; Optical pulses; Photochromism; Pulse measurements;
Conference_Titel :
Semiconductor Conference, 1995. CAS'95 Proceedings., 1995 International
Conference_Location :
Sinaia
Print_ISBN :
0-7803-2647-4
DOI :
10.1109/SMICND.1995.494870
