High diffraction efficiency polarization gratings recorded by biphotonic holography in an azobenzene liquid crystalline polyester

C Sánchez, R Alcalá, Søren Hvilsted, P.S. Ramanujam

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Abstract

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.
Original languageEnglish
JournalApplied Physics Letters
Volume78
Issue number25
Pages (from-to)3944-3946
ISSN0003-6951
DOIs
Publication statusPublished - 2001

Bibliographical note

Copyright (2001) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • SPECTROSCOPY
  • DATA-STORAGE
  • MOIETIES
  • POLYMER-FILMS
  • SIDE-CHAIN

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