d'Alessandro A, Asquini R, Gizzi C, Caputo R, Umeton C, Veltri A, Sukhov A V
Department of Electronic Engineering, University of Rome La Sapienza, National Institute for the Physics of Matter, Via Eudossiana 18, 00184 Rome, Italy.
Opt Lett. 2004 Jun 15;29(12):1405-7. doi: 10.1364/ol.29.001405.
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.
我们报告了由一系列被各向同性聚合物薄片隔开的连续排列向列型液晶层制成的体透射光栅在632.8纳米和1550纳米波长下的衍射特性。这些光栅是通过用波长为352纳米、总强度约为10毫瓦/平方厘米的激光束对稀释在各向同性预聚物中的液晶溶液进行全息固化而产生的。测量得到的衍射效率为98%，低至5伏/微米的电场就能关闭相位光栅。通过使用包括光栅双折射效应的修正耦合模理论对测量的角谱进行拟合。
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