Mr. Chang-Chiang Cheng Profile

Chang-Chiang Cheng

at Innolux Corp

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Proceedings Article | 13 March 2024 Presentation

Electrically tunable gradient-index liquid crystal lenses: beyond the power law

Yi-Hsin Lin, Wei-Cheng Cheng, Viktor Reshetnyak, Hao-Hsin Huang, Ting-Wei Huang, Chang-Chiang Cheng, Yung-Hsun Wu, Chiu-Lien Yang

Proceedings Volume PC12907, PC129070K (2024) https://doi.org/10.1117/12.3010521

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Since 1979, liquid crystal lenses have been a target of perfect parabolic lenses. However, the constraints of the so-called power law coming from the physics and chemistry of nematic LC limit the development in large-aperture GRIN LC lenses. In this study we present electrically tunable progressive lenses utilizing nematic liquid crystals (LC). The proposed LC lens is capable of dynamically adjusting its focal length, functioning as either a positive or negative lens. Our findings reveal that the spatial distribution of lens power within the progressive LC lens, ranging from +4D to -3D, far surpassing the range of -0.87D to +0.87D which one may expect within the parabolic wavefront approximation. For a lens with a 30 mm aperture a total tunable range is 7.6 D (from +5.6D to -2D) which is 4.75 times larger than the traditional parabolic prediction~1.6D (from +0.8D to -0.8D). This study not only challenges conventional limitations set by optical phase differences in gradient-index LC lenses but also paves the way for transformative advancements in optics and beyond.

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