胆甾型液晶的不同视角揭示了独特的颜色和偏振变化。,ACS Applied Materials & Interfaces

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胆甾型液晶的不同视角揭示了独特的颜色和偏振变化。
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-16 , DOI: 10.1021/acsami.0c09845
Kyung Min Lee _{1,

2} , Mariacristina Rumi _{1,

2} , Matthew S Mills ₁ , Victor Reshetnyak ₃ , Dean R Evans ₁ , Timothy J Bunning ₁ , Michael E McConney ₁

Affiliation

众所周知，平面胆甾型液晶（CLC）具有鲜明的反射色，与液晶分子的旋向性和螺旋扭曲的节距有关。如果人们以倾斜角度观察这些胶片，则反射的颜色会随着与法线的夹角增加而蓝移。另一方面，螺旋轴位于基板平面中的均匀躺螺旋（ULH）CLC是众所周知的，但通常不与鲜艳的颜色相关联。在这里，我们检查了倾斜入射角下CLC的独特光学特性，特别是与各种入射角的平面和ULH CLC之间切换相关的光谱和偏振变化。在小入射角（0°<ψ<45°，其中ψ是相对于基板-CLC界面处的表面法线的入射角），从平面到ULH的电驱动螺旋重新定向会导致颜色发生蓝移，并且圆极化变为非极化切换行为。在大角度（45°<ψ<90°）下，行为会发生逆转，发生红移颜色变化，并且偏振从非偏振转换为圆偏振。通过ULH CLC传播的光的模型用于确认反射带的位置和偏振特性随实验观察到的入射角的变化。这项研究为ULH CLC提供了新的视角，并揭示了独特的可重构角度色度。从平面到ULH的电动螺旋重新定向会导致颜色发生蓝移，并从圆极化变为无极化切换行为。在大角度（45°<ψ<90°）下，行为会发生逆转，发生红移颜色变化，并且偏振从非偏振转换为圆偏振。通过ULH CLC传播的光的模型用于确认反射带的位置和偏振特性随实验观察到的入射角的变化。这项研究为ULH CLC提供了新的视角，并揭示了独特的可重构角度色度。从平面到ULH的电动螺旋重新定向会导致颜色发生蓝移，并从圆极化变为无极化切换行为。在大角度（45°<ψ<90°）下，行为会发生逆转，发生红移颜色变化，并且偏振从非偏振转换为圆偏振。通过ULH CLC传播的光的模型用于确认反射带的位置和偏振特性随实验观察到的入射角的变化。这项研究为ULH CLC提供了新的视角，并揭示了独特的可重构角度色度。发生红移颜色变化，并且偏振从非偏振转换为圆偏振。通过ULH CLC传播的光的模型用于确认反射带的位置和偏振特性随实验观察到的入射角的变化。这项研究为ULH CLC提供了新的视角，并揭示了独特的可重构角度色度。发生红移颜色变化，并且偏振从非偏振转换为圆偏振。通过ULH CLC传播的光的模型用于确认反射带的位置和偏振特性随实验观察到的入射角的变化。这项研究为ULH CLC提供了新的视角，并揭示了独特的可重构角度色度。

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A Different Perspective on Cholesteric Liquid Crystals Reveals Unique Color and Polarization Changes.

Planar cholesteric liquid crystals (CLCs) are well known for having vibrant reflective coloration that is associated with the handedness and the pitch length of the helicoidal twist of the liquid crystalline molecules. If one observes these films at oblique angles, the reflected colors blue-shift with increasing angles from normal. On the other hand, uniform lying helix (ULH) CLCs, where the helicoidal axis lies in the plane of the substrate, are well-known but are not typically associated with vibrant colors. Here, we examine the unique optical properties of CLCs at oblique incidence angles, specifically the spectral and polarization changes associated with switching between planar and ULH CLCs for various incidence angles. At small angles of incidence (0° < ψ < 45°, where ψ is the angle of incidence relative to the surface normal at the substrate–CLC interface), the electrically driven helical reorientation from planar to ULH results in a blue-shifting of the color and circularly polarized to unpolarized switching behavior. At large angles (45° < ψ < 90°), the behavior is reversed, with a red-shifting color change occurring and the polarization switching from unpolarized to circularly polarized. Modeling of the light propagation through ULH CLCs is used to confirm the change in position and polarization characteristic of the reflection band with incidence angle observed experimentally. This study provides a new perspective on ULH CLCs and reveals a unique reconfigurable angular chromaticity.

更新日期：2020-08-19

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