Morphological anisotropy of nano-dimensional arsenic trisulfide glass films and liquid crystal photoalignment Academic Article uri icon


  • The results of high-resolution x-ray reflectivity study of nano-dimensionally thin arsenic trisulfide (As 2 S 3) glass films, deposited on bare and ITO-coated glass substrates, re veal surface roughness anisotropy upon prolonged irradiation with polarized 436 nm blue light. The anisotropy is correlated with the photoinduced anisotropy and LC photoalignment observed on these thin films. However, the As 2 S 3 film's thickness is found to be drastically reduced during the reflectivity experiments. Having ruled out the exposure to blue light and x-ray radi ati on as the cause, we conclude that some ambient oxygen and moisture penetrate the film and create a second altered thin layer on top of a thicker film of As 2 S 3. The results confirm the viability of As 2 S 3 films for non-contact LC photoalignment material and suggests a need for further proce ss optimization to reduce the films' degeneration to increase their effectiveness. PACS number(s): 81.05.Kf, 82.50.Kx, 82.45.Mp

publication date

  • January 1, 2017