Bistable Switching of Diffractive Smectic-A Liquid Crystal Device between Haze-Free Transparent and High-Haze Translucent States,ACS Photonics

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Bistable Switching of Diffractive Smectic-A Liquid Crystal Device between Haze-Free Transparent and High-Haze Translucent States
ACS Photonics ( IF 6.5 ) Pub Date : 2018-06-08 00:00:00 , DOI: 10.1021/acsphotonics.8b00373
Jae-Won Huh ₁ , Tae-Hoon Choi ₁ , Jin-Hun Kim ₁ , Jae-Hyeon Woo ₁ , Jeong-Ho Seo ₁ , Tae-Hoon Yoon ₁

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Bistable operation of a phase grating device using smectic-A liquid crystals (SmA-LCs) is presented. The SmA-LC cell can be operated with very low power because it consumes power only while the state is being switched. This device uses the simple dielectric switching mechanism, and it is free from degradation by the impurity ions. For the switching of an SmA-LC cell, we formed interdigitated electrodes on both the top and bottom electrodes to apply the in-plane and vertical electric fields. We can control the diffracted light intensity easily by the change in the magnitude or duration of the applied voltage wave. We have shown that 98.1% of the incident light can be transferred from the zeroth to higher orders. Owing to the high diffraction efficiency, this device can provide an excellent translucent state. Moreover, it can provide the haze-free transparent state because an SmA-LC cell does not contain a polymer structure or impurity ions. We have shown that the device can provide outstanding performance, such as low power consumption, strong diffraction, high transmittance, high-haze translucent state, and high reliability for over 2 weeks. We expect that the device can be applied to switchable windows and window displays.

中文翻译：

无雾透明态和高雾度半透明状态之间的双折射Amectic-A液晶器件的双稳态切换

提出了使用近晶A液晶（SmA-LC）的相位光栅设备的双稳态操作。SmA-LC电池可以以非常低的功率运行，因为它仅在状态切换时才消耗功率。该器件使用简单的介电开关机制，并且不受杂质离子的降解。对于SmA-LC电池的切换，我们在顶部和底部电极上均形成了叉指式电极，以施加面内和垂直电场。通过改变施加的电压波的大小或持续时间，我们可以轻松地控制衍射光的强度。我们已经证明98.1％的入射光可以从零阶传输到更高阶。由于高衍射效率，该装置可以提供优异的半透明状态。而且，它可以提供无雾的透明状态，因为SmA-LC电池不包含聚合物结构或杂质离子。我们已经证明，该器件可以提供出色的性能，例如低功耗，强衍射，高透射率，高雾度半透明状态以及2周以上的高可靠性。我们希望该设备可以应用于可切换的窗口和窗口显示。

更新日期：2018-06-08

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