Bonfadini Silvio, Ciciulla Fabrizio, Criante Luigino, Zaltron Annamaria, Simoni Francesco, Reshetnyak Victor, Lucchetti Liana
Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Milano, 20133, Italy.
Departement of Phisycs, Politecnico di Milano, Milano, 20133, Italy.
Sci Rep. 2019 Jan 31;9(1):1062. doi: 10.1038/s41598-018-37351-7.
We demonstrate the all optical control of the molecular orientation of nematic liquid crystals confined in microfluidic channels engraved in lithium niobate. Microchannels are obtained by a novel approach based on femtosecond pulse laser micromachining carried on in controlled atmosphere. The combined effect of photovoltaic and pyroelectric fields generated by light in lithium niobate crystals on the liquid crystal orientation, is reported for the first time. The total space charge field and its dependence on the incident light intensity can be controlled by changing the direction of pump light propagation through the microfluidic chip. The results reported in this manuscript demonstrate that liquid crystals and lithium niobate can efficiently be combined in microfluidic configuration, in order to push forward a novel class of optofluidic devices.
我们展示了对限制在铌酸锂中刻蚀的微流体通道内的向列型液晶分子取向的全光控制。微通道是通过一种基于在可控气氛中进行的飞秒脉冲激光微加工的新方法获得的。首次报道了铌酸锂晶体中的光产生的光伏场和热释电场对液晶取向的联合作用。通过改变泵浦光通过微流体芯片的传播方向，可以控制总空间电荷场及其对入射光强度的依赖性。本手稿中报道的结果表明，液晶和铌酸锂可以在微流体配置中有效地结合起来，以推动一类新型光流体装置的发展。
