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. ; 2008 American Institute of Physics.
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. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 93:18(2008), p. 181115. [10.1063/1.3021388]
All-optical switching of holographic gratings made of polymer-liquid- crystal-polymer slices containing azo-compounds
De Sio, Luciano
;
2008
Abstract
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. ; 2008 American Institute of Physics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
