Liquid crystal lenses with tunable focal length

@article{Lin2017LiquidCL,
  title={Liquid crystal lenses with tunable focal length},
  author={Yi-Hsin Lin and Yu-Jen Wang and Victor Yu. Reshetnyak},
  journal={Liquid Crystals Reviews},
  year={2017},
  volume={5},
  pages={111 - 143}
}
ABSTRACT Lenses with tunable focal length play important roles in nature by helping species avoid predators and capture prey. Many practical devices mimic lens concept for imaging, sensing, and detection. This review covers fundamental optics of lenses and its extension to lenses made of liquid crystals (LCs). Three main types of LC lenses are described, namely, lenses with curved surfaces, flat gradient-index lenses and composite lenses. The review discusses advantages of LC lenses over their… 
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