Mechanism of scattering bistable light valves based on salt-doped cholesteric liquid crystals

Lin, K. H.; Tseng, Heng-Yi; Chang, Limin; Li, Cheng-Chang; Wang, Chun-Ta; Lin, Tung‐Ching

doi:10.1364/oe.444084

Cited by 11 publications

(7 citation statements)

References 32 publications

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“…Lin et. al [44] and Moheghi et. al [45] developed bistable smart windows based on ionic liquid doped CLC, which can also be switched between the transparent planar state and scattering focal conic states by applying voltages of different frequencies.…”

Section: Introductionmentioning

confidence: 91%

Smart Switchable Window with Bistability and Tunability of Transmission

Zhou,

Zhang,

Halder

et al. 2024

Advanced Optical Materials

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Windows are used everywhere, from buildings to vehicles. Smart switchable windows are highly sought‐after in order to reduce energy consumption. An ideal smart window should have two functions. First, it should be able to control privacy. Second, it should be able to control radiant energy flow. Here, a smart window is reported that possesses the two functions. The smart window is based on a dichroic dye‐doped cholesteric liquid crystal. It exhibits two stable states in the absence of applied voltage. One of them is the planar state that is optically absorbing without haze and can control radiant energy flow. The other state is the focal conic state that is optically scattering and can control privacy. Furthermore, when voltage is applied, the liquid crystal is switched to a heliconical state, where the transmittance can be tuned continuously. Thanks to its superior performance, this smart window has a big potential for applications in architectural and vehicle windows.

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Section: Introductionmentioning

confidence: 91%

Smart Switchable Window with Bistability and Tunability of Transmission

Zhou,

Zhang,

Halder

et al. 2024

Advanced Optical Materials

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“…And the liquid crystals are stabilized in the planar texture when the electric field is turned off. Moheghi et al discovered the effect of salt on negative dielectric liquid crystal devices with bistable mode and prepared salt-doped cholesteric liquid crystals (SDCLCs) [ 29 ]. As shown in Figure 3 , when a voltage is applied across the cell, a certain concentration of ions (about 2 wt%) causes a more obvious turbulence.…”

Section: Electrically Driven Multi-stable Modes Of Cholesteric Liquid...mentioning

confidence: 99%

Research Progress of Electrically Driven Multi-Stable Cholesteric Liquid Crystals

Wang,

Hu,

et al. 2023

Materials

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Electrically driven multi-stable cholesteric liquid crystals can be used to adjust the transmittance of incident light. Compared with the traditional liquid crystal optical devices, the multi-stable devices only apply an electric field during switching and do not require a continuous electric field to maintain the various optical states of the device. Therefore, the multi-stable devices have low energy consumption and have become a research focus for researchers. However, the multi-stable devices still have shortcomings before practical application, such as contrast, switching time, and mechanical strength. In this article, the latest research progress on electrically driven multi-stable cholesteric liquid crystals is reviewed, including electrically driven multi-stable modes, performance optimization, and applications. Finally, the challenges and opportunities of electrically driven multi-stable cholesteric liquid crystals are discussed in anticipation of contributing to the development of multi-stable liquid crystal devices.

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“…Instead of the optical electric field, an external applied AC field is used to induce index or birefringence changes needed to focus, rotate polarization, or switch the propagation direction of light. For some smart window applications, switching between a clear and a translucent/opaque/reflective state is desired and can be mediated by several mechanisms quite distinct from the foregoing discussions, namely, absorption, scattering, and combination of scattering & absorption [22][23][24][25][26][27][28][29][30].…”

Section: Electric Field Induced Light Scatterings and Transmission Mo...mentioning

confidence: 99%

Liquid crystals for optical switches, smart windows, reconfigurable/tunable meta-structures, micro-resonator coupling and plasmonic nanostructures

Khoo

2023

Liquid Crystals XXVII

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This review provides an overview of the wide-ranging dynamical nonlinear- and electro- optical responses of liquid crystals and reexamine some exemplary photonic applications such as smart windows/display, tunable/reconfigurable metamaterials or metasurfaces, plasmonic nanostructures, micro-ring resonator, and chiral photonic crystals for polarizations and manipulations of ultrafast pulsed lasers of complex polarization states.

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Mechanism of scattering bistable light valves based on salt-doped cholesteric liquid crystals

Cited by 11 publications

References 32 publications

Smart Switchable Window with Bistability and Tunability of Transmission

Smart Switchable Window with Bistability and Tunability of Transmission

Research Progress of Electrically Driven Multi-Stable Cholesteric Liquid Crystals

Liquid crystals for optical switches, smart windows, reconfigurable/tunable meta-structures, micro-resonator coupling and plasmonic nanostructures

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