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INVESTIGATION OF BRAGG GRATINGS RECORDED IN POLYMER DISPERSED LIQUID CRYSTALS

K. Beev1,* , S. Sainov1, T. Angelov2, A. G. Petrov2

Affiliation

  1. Central Laboratory of Optical Storage and Processing of Information, BAS, 1113 Sofia, Acad. G. Bonchev Str., bl. 101, Bulgaria
  2. Institute of Solid State Physics, BAS, 72 Tsarigradsko Chausse Blvd, 1784 Sofia, Bulgaria

Abstract

Bragg gratings, holographically formed in polymer-dispersed liquid crystals (H-PDLCs) are studied. Mixture of the commercially available E7 liquid crystal and NOA65 polymer in ration 1:1 are employed. Polymerisation in presence of electric field is produced. A significant increase of the diffraction efficiency in the case of field-applied recording is observed. The exposure characteristics, electric field switching behaviour, polarization and Bragg angle dependences are examined..

Keywords

Polymer, Liquid crystal, Holographic grating.

Submitted at: June 5, 2004
Accepted at: June 22, 2004

Citation

K. Beev, S. Sainov, T. Angelov, A. G. Petrov, INVESTIGATION OF BRAGG GRATINGS RECORDED IN POLYMER DISPERSED LIQUID CRYSTALS, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 799-803 (2004)