title: Polarization patterns hide and display using photoinduced anisotropy of photochromic fulgide.
abstract: Photoinduced anisotropy of a photochromic pyrrylfulgide/PMMA film was investigated by using two linearly polarized beams. Excitation by linearly polarized light induces into the film an optical axis that has the same polarization as the excitation beam. This causes a change of the transmittance and of the polarization state of the detection beam. With a microscope a matrix of 4x4 light spots with different polarizations were recorded in the pyrrylfulgide/PMMA film. If readout with non-polarized light, the matrix of light spots show no information pattern. However, when readout with differently polarized lights, different patterns can be displayed. The experiment demonstrates that pyrrylfulgide/PMMA films can be used to hide two differently polarized patterns, which may be applied in camouflage technology.
authors.forename: Baoli
authors.initials: B
authors.lastname: Yao
authors.forename: Yingli
authors.initials: Y
authors.lastname: Wang
authors.forename: Ming
authors.initials: M
authors.lastname: Lei
authors.forename: Neimule
authors.initials: N
authors.lastname: Menke
authors.forename: Guofu
authors.initials: G
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.forename: Tiankai
authors.initials: T
authors.lastname: Li
authors.forename: Meigong
authors.initials: M
authors.lastname: Fan