Gao Liang, Zheng Zhe-Zhe, Zhu Ji-Liang, Han Wen-Ming, Sun Yu-Bao
Opt Lett. 2016 Aug 15;41(16):3775-8. doi: 10.1364/OL.41.003775.
We proposed a dual-period phase grating using a polymer-stabilized blue phase liquid crystal (PS-BPLC). High efficiencies of 38% for the short-period phase grating and 30% for the long-period phase grating have been achieved because of the electric-field-induced rectangular-like phase profile of a PS-BPLC, which agrees quite well with the simulation results. The diffraction angle and the diffraction efficiency can be alternatively tuned by a bias voltage and intensity of applied voltage. The diffracted light of each diffraction order is elliptically polarized, and its ellipticity is larger than that induced by using the conventional nematic LCs. Such a device also shows sub-millisecond response time and holds great potential for photonics applications.
我们提出了一种使用聚合物稳定蓝相液晶（PS-BPLC）的双周期相位光栅。由于PS-BPLC的电场诱导矩形相位分布，短周期相位光栅实现了38%的高效率，长周期相位光栅实现了30%的高效率，这与模拟结果非常吻合。衍射角和衍射效率可以通过偏置电压和施加电压的强度交替调节。每个衍射级次的衍射光都是椭圆偏振的，其椭圆率大于使用传统向列型液晶所诱导的椭圆率。这种器件还具有亚毫秒级的响应时间，在光子学应用中具有巨大潜力。
