Dipartimento di Scienze e Ingegneria della Materia, dell'Ambiente ed Urbanistica and CNISM Università Politecnica delle Marche, Ancona, Italy.
Opt Lett. 2013 Mar 15;38(6):878-80. doi: 10.1364/OL.38.000878.
A first-order optical Freedericksz transition in a nematic liquid crystal doped by a small quantity of a dichroic dye with negative dichroism is observed. The initial homeotropic state corresponds to maximum absorption for the linearly polarized incident beam, while reorientation reduces absorption increasing the optical torque: this process produces the positive feedback leading to the observed bistable behavior.
在向具有负二向色性的二色性染料少量掺杂的向列相液晶中观察到一级光学 Freedericksz 跃迁。初始的垂直取向状态对应于线偏振入射光束的最大吸收，而重新取向则增加吸收减少光学扭矩：这个过程产生了导致观察到双稳行为的正反馈。
