Dye-doped dual-frequency nematic cells as fast-switching polarization-independent shutters

Li, Bingxiang; Xiao, Rui-Lin; Paladugu, Sathyanarayana; Shiyanovskii, Sergij V.; Lavrentovich, Oleg D.

doi:10.1364/oe.27.003861

Cited by 19 publications

(8 citation statements)

References 12 publications

(22 reference statements)

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“…Another method is to change the alignment of liquid crystal molecules. Huh 87 et al investigated the angular dependence of dye transmittance in planar Ch-LC, PSLC, and ion-doped LCs, as shown in Fig. 6d .…”

Section: Principles Of Lc-based Light Protectionmentioning

confidence: 99%

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Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Zhang

Han

et al. 2023

Light Sci Appl

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With the development of optical technologies, transparent materials that provide protection from light have received considerable attention from scholars. As important channels for external light, windows play a vital role in the regulation of light in buildings, vehicles, and aircrafts. There is a need for windows with switchable optical properties to prevent or attenuate damage or interference to the human eye and light-sensitive instruments by inappropriate optical radiation. In this context, liquid crystals (LCs), owing to their rich responsiveness and unique optical properties, have been considered among the best candidates for advanced light protection materials. In this review, we provide an overview of advances in research on LC-based methods for protection against light. First, we introduce the characteristics of different light sources and their protection requirements. Second, we introduce several classes of light modulation principles based on liquid crystal materials and demonstrate the feasibility of using them for light protection. In addition, we discuss current light protection strategies based on liquid crystal materials for different applications. Finally, we discuss the problems and shortcomings of current strategies. We propose several suggestions for the development of liquid crystal materials in the field of light protection.

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Section: Principles Of Lc-based Light Protectionmentioning

confidence: 99%

“…d Transmittance of dye-doped LC devices with different alignments where doping had the strongest light absorption properties in Ch-LC. Adapted with permission from ref 87. .…”

mentioning

confidence: 99%

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Zhang

Han

et al. 2023

Light Sci Appl

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“…The driving voltages to induce switching transition between these two frequencies are typically in the range 1-10 V and depend on the rotational viscosity γ and Frank's elastic constants K 11 , K 22 and K 33 of the liquid crystal medium. In DFLC the response times can be reduced by application of high voltages to drive the reorientations at both the frequencies f L and f H giving rise to ultrafast response times while exhibiting tunable optical responses [35][36][37]. However application of higher voltages is not feasible for the flat optics based devices and one would ideally like to operate LC devices with smaller voltages.…”

Section: Introductionmentioning

confidence: 99%

Ultra Fast Switching of DFLC Based Dynamic Metasurfaces

Sakhare

Dontabhaktuni

2022

Front. Phys.

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Dielectric metasurfaces give rise to very interesting optical and photonic properties such as Huygens lens, absolute transmission and absorption, directional scattering, etc. Liquid crystal based dynamic metasurfaces are being increasingly explored due to their excellent tunability of polarization, phase and amplitude modulations, enabling applications in spatial light modulators (SLM’s), holography, AR and VR and flat optics. We investigate the effect of geometry of dielectric microstructures on electromagnetic response and switching of Dual frequency liquid crystal based metasurfaces in the mid-IR range of frequencies. Scattering response, near-field profiles and far-field radiation show significant dependence on the alignment and geometry of the microstructures. At selected frequencies switching between different polarization directions and variable phase modulations are observed simultaneously. Response times calculated theoretically show switching times of the order of milliseconds paving way for ultrafast multifunctional active metasurfaces.

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“…This makes dual-frequency nematic liquid crystals (DFNLC) suitable materials for applications that require high phase shift and fast switching times. Although DFNLC are recognized as good candidates for the development of fast switching liquid crystal devices [18][19][20][21][22], their electro-optical performance over a broad range of liquid crystal layer thicknesses has not been studied. Typically, only a single value of the cell thickness has been considered.…”

Section: Introductionmentioning

confidence: 99%

Electro-Optical Switching of Dual-Frequency Nematic Liquid Crystals: Regimes of Thin and Thick Cells

et al. 2019

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Conventional display applications of liquid crystals utilize thin layers of mesogenic materials, typically less than 10 µm. However, emerging non-display applications will require thicker, i.e., greater than 100 µm, layers of liquid crystals. Although electro-optical performance of relatively thin liquid crystal cells is well-documented, little is known about the properties of thicker liquid crystal layers. In this paper, the electro-optical response of dual-frequency nematic liquid crystals is studied using a broad range (2–200 µm) of the cell thickness. Two regimes of electro-optical switching of dual-frequency nematics are observed and analyzed.

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Dye-doped dual-frequency nematic cells as fast-switching polarization-independent shutters

Cited by 19 publications

References 12 publications

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Ultra Fast Switching of DFLC Based Dynamic Metasurfaces

Electro-Optical Switching of Dual-Frequency Nematic Liquid Crystals: Regimes of Thin and Thick Cells

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