Cholesteric liquid crystals (CLCs) are an important soft material for display and sensing technologies due to their unique optical and thermal properties, which are susceptible to external perturbations such as the electric field and temperature variation. The typically periodic structure of a CLC with a twist between molecular layers permits its chiral photonic crystallinity and the resulting selective reflection of a bandwidth in the otherwise generally high transmission spectrum of incident light. Here we report on a novel dual-mode CLC device as smart glass that enables the transparency to be self-adaptive to temperature and is simultaneously characterized by a fully on-demand, electrically controlled function, allowing users to regulate the suitable or desired extent of transparency in accordance with their living climate zones or personal needs. The working principle is based on the controllable strength of voltage-induced electrohydrodynamic flow, generating temperature-dependent dynamic scattering for passive control. Moreover, the transmission can be reversibly modulated and switched by applied AC voltage for active control between the transparent and opaque states. As a proof of concept, the characteristic Bragg reflection can be designed to sit in the near-infrared region to partially block unwanted thermal radiation in the optically transparent state.

中文翻译：

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面向智能玻璃的电有源和热无源液晶器件

胆甾型液晶 (CLC) 具有独特的光学和热特性，容易受到电场和温度变化等外部扰动的影响，是用于显示和传感技术的重要软材料。在分子层之间具有扭曲的 CLC 的典型周期性结构允许其手性光子结晶性和由此产生的带宽的选择性反射，否则通常会在入射光的高透射光谱中进行。在这里，我们报告了一种作为智能玻璃的新型双模 CLC 设备，它使透明度能够自适应温度，同时具有完全按需电控功能的特点，允许用户根据他们的生活气候区或个人需要调节合适或所需的透明度程度。其工作原理是基于电压感应电流体动力流的可控强度，产生用于被动控制的温度相关动态散射。此外，传输可以通过施加的交流电压可逆地调制和切换，以在透明和不透明状态之间进行主动控制。作为概念证明，可以将特征布拉格反射设计为位于近红外区域，以在光学透明状态下部分阻挡不需要的热辐射。传输可以通过施加的交流电压可逆地调制和切换，以在透明和不透明状态之间进行主动控制。作为概念证明，可以将特征布拉格反射设计为位于近红外区域，以在光学透明状态下部分阻挡不需要的热辐射。传输可以通过施加的交流电压可逆地调制和切换，以在透明和不透明状态之间进行主动控制。作为概念证明，可以将特征布拉格反射设计为位于近红外区域，以在光学透明状态下部分阻挡不需要的热辐射。