All-optical switching of holographic gratings made of polymer-liquid-crystal-polymer slices containing azo-compounds

De Sio, Luciano; Veltri, Alessandro; Umeton, Cesare; Serak, Svetlana; Tabiryan, Nelson
November 2008
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p181115
Academic Journal
We present the observation of an all-optical switching effect that takes place when a light beam of suitable wavelength irradiates a “layered” structure made of polymer slices alternated to films of well aligned liquid crystal (LC) which contain also a small percentage of azo-LC molecules. The simple and reliable fabrication procedure exploits a holographic UV curing technique. The observed switching effect takes place in samples that exhibit diffraction efficiency as high as 85% and is induced in less than 0.5 s by an unfocused pump beam of 245 mW/cm2 power density.


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