Electro-optic properties of switchable gratings made of polymer and nematic liquid-crystal slices.
Electro-optic properties of switchable gratings made of polymer and nematic liquid-crystal slices.
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DOI：
10.1364/ol.29.001405
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发表时间：
2004-06
期刊：
影响因子：
3.6
通讯作者：
A. d’Alessandro;R. Asquini;C. Gizzi;R. Caputo;C. Umeton;A. Veltri;A. V. Sukhov
中科院分区：
文献类型：
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作者：
A. d’Alessandro;R. Asquini;C. Gizzi;R. Caputo;C. Umeton;A. Veltri;A. V. Sukhov
我们报道了由各向同性聚合物片隔开的连续排列的向列液晶层组成的体积透射光栅在632.8和1550 nm波长处的衍射特性。光栅是用波长为352 nm、总强度约为10 mW/cm2的激光束全息固化在各向同性预聚物中稀释的液晶溶液而产生的。测量到98%的衍射效率，低至5 V/微米的电场关闭相位光栅。利用改进的耦合模理论拟合测量的角光谱，考虑光栅双折射的影响。
We report the diffraction properties at wavelengths of 632.8 and 1550 nm for volume transmission gratings made of a sequence of continuously aligned nematic liquid-crystal layers separated by isotropic polymer slices. The gratings are generated by holographically curing a solution of liquid crystal diluted in an isotropic prepolymer by means of a laser beam at a wavelength of 352 nm with a total intensity of approximately 10 mW/cm2. A diffraction efficiency of 98% was measured, and an electric field as low as 5 V/microm switches off the phase grating. Measured angular spectra are fitted by use of the modified coupled-mode theory including the effects of grating birefringence.