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Electrohydrodynamically Driven Broadband and Color-Shifting in Cholesteric Liquid Crystals
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DOI：10.1002/adom.71610.png)
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Abstract
En 中文
Rapid, multimode photonic bandgap tuning of cholesteric liquid crystals (CLCs) is achieved by harnessing ion-driven electrohydrodynamic (EHD) effects. By utilizing CLCs with negative dielectric anisotropy doped with ions and applying low-frequency AC voltage, two distinct optical phenomena are observed: a rapid color-shifting mode and a broadening mode. This method achieves dynamic tunability and enhanced optical performance with significantly reduced response times. The color-shifting mode enables the reflection band to traverse the entire visible spectrum within milliseconds while maintaining a reflection of approximately 37% when shifting from red to blue. In the broadening mode, the reflection band expands to cover the entire visible spectrum with an average reflection exceeding 30%. These results, driven by electrohydrodynamic effects and ion concentration, highlight unique advantages, including fast response, simplicity, and durability. This study not only introduces a fundamentally different mechanism for reflection band tuning but also demonstrates significant potential for material applications in dynamic optics, advanced coatings, and adaptive photonic devices.
Keywords:
band gap broadening
band gap shifting
bandgap modulation
cholesteric liquid crystal
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7.2
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