Journal article
High diffraction efficiency polarization gratings recorded by biphotonic holography in an azobenzene liquid crystalline polyester
University of Zaragoza1
The Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark2
Department of Chemical and Biochemical Engineering, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
High diffraction efficiencies have been achieved with polarization gratings recorded in thin films of an azobenzene side-chain liquid crystalline polyester by means of biphotonic processes. Efficiency values up to 30% have been reached after an induction period of 300 s and subsequent evolution with the sample in darkness.
These values are at least two orders of magnitude higher than those previously reported for biphotonic recording. The gratings can be erased with unpolarized blue light and partial recovery of the diffraction efficiency has been observed after the erasure process when the sample is kept in darkness.
Red light illumination of the erased film increases the recovered efficiency value and the recovery rate.
| Language: | English |
|---|---|
| Publisher: | American Institute of Physics |
| Year: | 2001 |
| Pages: | 3944-3946 |
| ISSN: | 10773118 and 00036951 |
| Types: | Journal article |
| DOI: | 10.1063/1.1379791 |
