Liquid crystal aligned on the apparent isotropic surface in the liquid crystal cell: optical characterization

Meng, Xiangshen; Li, Guoqing; Zhao, Jianwei; Li, Jian; Ye, Wenjiang; Lin, Yueqiang; Liu, Xiaodong; Li, Decai; He, Zhenghong

doi:10.1007/s00340-021-07670-1

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…The alignment of the LCs can be easily controlled by the surface pretreatment of the cell, providing a convenient way for fabricating sensors. [69,70] The upper surface of the flat geometry can be switched among solid surface, aqueous surface, and air surface. For the detection of ions, the aqueous surface is the most commonly used, in which the LC cell is in the form of a copper grid immobilized on a glass substrate.…”

Section: Geometriesmentioning

confidence: 99%

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

2022

Advanced Photonics Research

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Liquid crystals (LCs) are nanophotonic materials which can interact with light in the molecular scale. While the LCs are widely used in various displays, last decade has witnessed emerging applications of the LCs for nondisplays. Based on the unique stimuli–responsive property and optical property, the applications of the LCs in the field of sensors are widely explored. In addition, ions are widely distributed in nature and bionts, playing critical roles in many physiological activities and ecological cycles. Appropriate amount of ions is beneficial to the human body, while the excess ions can cause irreversible damages. As a result, a variety of LC sensors are proposed to detect the ion concentration in both body fluids and water samples. This article reviews the design principles, applications, and existing problems of the LC ion sensors. The geometries, alignments, and optical signals of the sensors, which can guide the design of the devices, are first discussed. Afterward, two types of LC ion sensors aiming at detecting metal ions and nonmetallic ions, respectively, are illustrated. Finally, the current challenges and potential development directions of the LC ion sensors are introduced briefly.

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Section: Geometriesmentioning

confidence: 99%

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

2022

Advanced Photonics Research

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“…In our early work, the LC doped with γ-Fe2O3 NPs can increase the dielectric constant and improve the electro-optical response [13,14]. In addition, the transmittance curves with angle (T-θ) were measured using θ-scanning technology to investigate the anisotropic optical properties of ferrofluids and LCs [15,16]. The results show that using circularly polarized light (CPL) as the incident light, the transmittance curve with angle (T-θ) for a ferrofluids sample indicates linear magneto-optical effects [15].…”

Section: Introductionmentioning

confidence: 99%

Reveal linear optical effects of the liquid crystal by Stokes-Mueller calculus and θ-scan technology

Meng

Lin

et al. 2022

Preprint

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Based on the Stokes-Mueller calculus, linear optical effects of liquid crystals were investigated using the θ-scan technology. Usually, when a circularly polarized light beam passes through an anisotropic optical medium, the transmitted light beam behaves as elliptically polarized light. The Stokes-Mueller calculus shows that the change of the transmitted light intensity includes the linear optical characteristics of the medium, such as dichroism, birefringence, and ellipticity. Meanwhile, these optical characteristics can be probed simultaneously from the transmittance curve using an angular scan (T-θ), i.e., θ-scan technology. As the nanoparticle (NP) concentration in the liquid crystal increases from 0 to 0.1 wt%, the apparent dichroism monotonously decreases with the NP concentration. LC molecules are highly birefringent, resulting in Nπ uncertainty on the T-θ curve. As a result, when the NP concentration rises from 0 to 0.06 wt %, the ellipticity decreases; when the NP concentration rises from 0.06 wt % to 0.1 wt %, the ellipticity increases. However, from the change in the apparent phase delay with the NP concentration, Nπ can be distinguished. As well, birefringence decreases monotonously with the NP concentration.

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Highly stable low-voltage operating mobile transparent heaters based on spray-coated MXene/silver nanowire nanocomposite electrodes powered by indoor solar cells

Park,

Kim

et al. 2024

Applied Surface Science

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Liquid crystal aligned on the apparent isotropic surface in the liquid crystal cell: optical characterization

Cited by 5 publications

References 46 publications

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

Reveal linear optical effects of the liquid crystal by Stokes-Mueller calculus and θ-scan technology

Highly stable low-voltage operating mobile transparent heaters based on spray-coated MXene/silver nanowire nanocomposite electrodes powered by indoor solar cells

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