5 December 2022

Self-organization of chiral liquid crystal in cells with photopatterned surface anchoring allows to realize multistable states with hysteresis in the electro-optic switching. Crossed assembly of periodically rotating anchoring patterns gives rise to the formation of different superstructures with smaller or larger amount of chirality. The straightforward fabrication process in combination with the bistable behavior offers great perspectives for photonic applications. Related to this work, a paper has recently been published in Advanced Optical Materials:
https://onlinelibrary.wiley.com/doi/full/10.1002/adom.202201289?campaign=woletoc
11 February 2022

Photo-patterned defectgrids

A photo-patterned defectgrid at one of the substrates allows to stabilize a multitude of metastable disclination lines in a nematic liquid crystal cell. In our studies, we pattern the bottom surface with a periodic array of +-1/2 defects and combine this with uniform planar or uniform homeotropic anchoring at the top interface. Different types of horizontal, vertical and diagonal disclinations are formed and their properties are studied experimentally and with the help of numerical simulations. Related to this work, two papers have recently been accepted for publication:
https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.202101626
https://www.sciencedirect.com/science/article/abs/pii/S0167732222002471?via%3Dihub