CAJ | 학술논문

为了提高聚合物/液晶（HPDLC）光栅的衍射效率并改善光栅的表面形貌，研究了表面垂直取向处理对HPDLC光栅的影响。首先，研究了表面垂直处理对液晶分子的取向作用，发现垂直取向层对液晶的锚定作用随着盒厚的增加而逐渐减弱，取向层的作用范围大概在3μm ～5μm之间；其次，对相分离程度进行了实验表征，结果表明，随着液晶盒厚度的增加，相分离开始的时间越来越快，并且分离程度也越来越彻底。最后，讨论了表面垂直取向对 HPDLC光栅衍射效率的影响，随着盒厚的增加，相分离出来的液晶微滴形成连续的区域，光栅的衍射效率逐渐升高，当盒厚增加到一定程度，其衍射效率和无取向处理的光栅接近。当盒厚过大时，垂直取向处理对HPDLC光栅散射损失并没有太大的改善，只有当盒厚适中（12μm）时，光栅的衍射效率最高，散射损失最小。
위료제고취합물/액정（HPDLC）광책적연사효솔병개선광책적표면형모，연구료표면수직취향처리대HPDLC광책적영향。수선，연구료표면수직처리대액정분자적취향작용，발현수직취향층대액정적묘정작용수착합후적증가이축점감약，취향층적작용범위대개재3μm ～5μm지간；기차，대상분리정도진행료실험표정，결과표명，수착액정합후도적증가，상분리개시적시간월래월쾌，병차분리정도야월래월철저。최후，토론료표면수직취향대 HPDLC광책연사효솔적영향，수착합후적증가，상분리출래적액정미적형성련속적구역，광책적연사효솔축점승고，당합후증가도일정정도，기연사효솔화무취향처리적광책접근。당합후과대시，수직취향처리대HPDLC광책산사손실병몰유태대적개선，지유당합후괄중（12μm）시，광책적연사효솔최고，산사손실최소。
In order to get the holographic polymer dispersed liquid crystal (HPDLC ) grating with high diffraction efficiency and perfect morphology ,the effect of surface vertical alignment on the properties of HPDLC grating was investigated .Firstly ,the effect of the vertical surface treatment on the orientation of liquid crystal molecules was studied .It is found that the vertical anchor effect of liquid crystal decreases with the increase of cell gap and the orientation depth is about 3 μm ~ 5 μm .Secondary ,the characterization experiment of separation was done .And results show that as the cell gap increases ,the surface effect on the bulk LC droplets reduces due to the longer distance .For the thinner cell ,almost all the LC droplets are confined on the inner surfaces of the substrates which cannot flow and coalesce with the neighboring droplets , so the phase separate is not good .However ,if the cell is too thick ,the effect of vertical align‐ment on the LC droplets in the middle of the cell is very small and the bulk droplets are less or‐dered so that the morphology is similar to those of conventional (without vertical alignment) HPDLC cells .Experimental results indicate that only in the condition of certain surface vertical alignment strength(cell gap is 12 μm ) ,the HPDLC with high diffraction efficiency and low scattering loss can be realized .