Electro-optical modulators in polymer-dispersed liquid crystal complexes

✍ Scribed by R. WęgŁowski; S.J. KŁosowicz; A. Majchrowski; K. Ozga; I.V. Kityk; S. Calus; M. Chmiel

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 186 KB
• Volume: 48
• Category: Article
• ISSN: 0143-8166
• DOI: 10.1016/j.optlaseng.2010.04.004

✦ Synopsis

The influence of bicolor optical treatment on the behaviour of the linear and quadratic electro-optical effects in the LCBO NC incorporated into the liquid crystalline matrix is studied. Simultaneously their dependence on frequency is analyzed. With increasing power density up to 250-270 MW/cm 2 there is a substantial increase of the electro-optical coefficient at 1150 nm up to 1.75 pm/V and 1.53 pm/V for 5% and 3% LCBO nanocrystallites, respectively. Further enhancement of the photo-inducing treatment leads to a saturation of the process. The behaviour of the maximal quadratic electro-optics coefficient R 2233 demonstrates principally different photo-inducing dependences. For both LCBO contents we observe an occurrence of the maximum in the electro-optical coefficients situated at 120 and 180 MW/cm 2 powers for the fundamental laser beams. However, contrary to the Pockels effect the enhanced content of the LCBO NC leads to a decrease of the observed effect.