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Slow light in liquid crystal media

机译:液晶介质中的光慢

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Liquid crystal media are characterized by large and tunable dispersive properties and hence allow achievement of large group delays. At the same time, liquid crystals provide large areas and are easily recon-figurable and highly sensitive devices; they are, therefore, well adapted for interferometric applications. Two different ways of achieving slow light in liquid crystals are presented. The first method consists of exploiting photoisomerization-induced transparency in dye-doped chiral liquid crystals, and the second method makes use of two-wave mixing optical resonance in pure nematics. In both mechanisms, two beams are sent to the medium, where they create a grating, either of absorption or of refractive index. Both physical mechanisms are elucidated in the context of slow light, then, as examples of sensing applications, Doppler shift measurements and adaptive holography are presented.
机译:液晶介质的特点是具有大且可调节的色散特性,因此可以实现较大的群延迟。同时,液晶提供了大面积且易于重新配置和高度敏感的设备。因此,它们非常适合干涉测量应用。提出了两种在液晶中实现缓慢发光的方法。第一种方法包括利用染料掺杂的手性液晶中的光异构化诱导的透明性,第二种方法利用纯向列相中的两波混合光学共振。在这两种机制中,两束光被发送到介质,在介质中形成吸收或折射率的光栅。在慢速照明的情况下阐明了这两种物理机制,然后以传感应用为例,介绍了多普勒频移测量和自适应全息技术。

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