title: In situ X-ray absorption fine structure detection of reversible photoinduced anisotropy in amorphous selenium.
abstract: Photoinduced anisotropy in amorphous selenium ( a-Se) has been studied by in situ x-ray absorption fine structure spectroscopy. It is found that upon irradiation with linearly polarized light the chainlike fragments in a-Se are oriented with their c-axis perpendicular to the polarization plane of the inducing light. This chain orientation is reversible, correlates with optical anisotropy, and acts as a prelude to photoinduced anisotropic crystallization. This optically controlled reorientation of molecular fragments in a solid can be a basis for future novel devices.
authors.affiliation: Joint Research Center for Atom Technology (JRCAT), National Institute for Advanced Interdisciplinary Research (NAIR), Tsukuba, Ibaraki 305-8562, Japan.
authors.forename: A V
authors.initials: AV
authors.lastname: Kolobov
authors.forename: H
authors.initials: H
authors.lastname: Oyanagi
authors.forename: K
authors.initials: K
authors.lastname: Tanaka