Abstract
In this report we study the formation of surface relief in arsenic trisulfide films under laser light radiation with modulated polarization direction. The formation of surface relief is obtained with method what is different from holographic recording – only one laser beam with modulated polarization direction was used. Samples with different thickness were made using vacuum evaporation. The photo-induced changes on the surface were initiated by DPSS laser light (λ = 532nm). Profiles of surface reliefs were observed and relief depth dependence on film thickness and exposure was studied.
Highlights
Structure like surface relief grating (SRG) can be used as diffractive optical element and as Bragg reflector
SRG recorded with different polarisation modulations was studied first
Recording with all four configurations gave positive results (Figure 2.), but SRG recorded with S-P modulation was the deepest
Summary
Structure like surface relief grating (SRG) can be used as diffractive optical element and as Bragg reflector. The one beam method was used to study SRG formation in chalcogenide films. As2S3 is known as inorganic polymer, which is often used in holography due to large photo-induced changes of its chemical and optical properties [1.2.3]. It has been studied since 1950’ and a lot of interesting optical phenomena [1.2.3.4.5.6] like photoexpansion, photodarkening, photo-induced dichroism and birefringence were discovered. Studying SRG formation process mainly consists of finding appropriate conditions for efficient photo-induced mass transport. Since there is no interference, set-up is stable to vibrations and there is no need in high coherence of recording light source.
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