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

被引：39

作者：

De Sio, Luciano ^{[1
,2
]}

Veltri, Alessandro ^{[1
,2
]}

Umeton, Cesare ^{[1
,2
]}

Serak, Svetlana ^{[3
]}

Tabiryan, Nelson ^{[3
]}

机构：

[1] Univ Calabria, LICRYL, Natl Inst Phys Matter, INFM CNR,Ctr Excellence CEMIF CAL, I-87036 Cosenza, Italy

[2] Univ Calabria, Dept Phys, I-87036 Cosenza, Italy

[3] Beam Engn Adv Measurements Co, Winter Pk, FL USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 18期

关键词：

curing; holographic gratings; liquid crystals; polymers;

D O I：

10.1063/1.3021388

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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/cm(2) power density.

引用

页数：3

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