In situ X-ray absorption fine structure detection of reversible photoinduced anisotropy in amorphous selenium.
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.
Kolobov
A V
AV
Joint Research Center for Atom Technology (JRCAT), National Institute for Advanced Interdisciplinary Research (NAIR), Tsukuba, Ibaraki 305-8562, Japan.
Oyanagi
H
H
Tanaka
K
K