Kasyanova Irina V, Geivandov Artur R, Artemov Vladimir V, Gorkunov Maxim V, Palto Serguei P
Liquid crystals laboratory, Shubnikov Institute of Crystallography of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 119333 Leninsky Ave. 59, Moscow, Russia.
Beilstein J Nanotechnol. 2018 Jan 4;9:42-47. doi: 10.3762/bjnano.9.6. eCollection 2018.
We have studied the alignment of a nematic liquid crystal (LC) material on aluminum subwavelength nanogratings as a function of the period, , and the slit width to period ratio, . A method, based on Fourier analysis of the transmittance spectra of the LC grating system, has been applied. We show that the gratings provide stable planar alignment only for shorter periods and narrower slits ( < 400 nm, / < 2/3). As these parameters increase, the homogeneous surface alignment changes to domains with different tilt angles or to spatially modulated alignment. We have also obtained a 90° twisted LC director distribution, implying sufficiently strong azimuthal LC anchoring at the grating surface.
我们研究了向列型液晶（LC）材料在铝亚波长纳米光栅上的取向，该取向是周期(\Lambda)以及狭缝宽度与周期之比(w/\Lambda)的函数。我们应用了一种基于对LC光栅系统透射光谱进行傅里叶分析的方法。我们表明，光栅仅在较短周期和较窄狭缝（(\Lambda < 400)nm，(w/\Lambda < 2/3)）时提供稳定的平面取向。随着这些参数增加，均匀的表面取向会转变为具有不同倾斜角的畴或空间调制取向。我们还获得了90°扭曲的LC指向矢分布，这意味着在光栅表面有足够强的方位角LC锚定。
