Single-Shot Quantitative Polarization Imaging of Complex Birefringent Structure Dynamics

Ge, Baoliang; Zhang, Qing; Zhang, Rui; Lin, Jing-Tang; Tseng, Po-Hang; Chang, Che‐Wei; Dong, Chongying; Zhou, Renjie; Yaqoob, Zahid; Bischofberger, Irmgard; So, Peter T. C.

doi:10.1021/acsphotonics.1c00788

Cited by 16 publications

(13 citation statements)

References 53 publications

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“…A low value of retardance in flowing DSCG solutions reflects the tumbling character of the material that leads to a nonzero viscous torque for any orientation of the director with α 2 α 3 < 0, where α 2 and α 3 are the Leslie viscosity coefficients ( 35 ). As a result of the nonzero viscous torque, twist-type topological defects spontaneously occur in the material, which leads to a low retardance ( 33 , 42 , 46 ). That the viscous fingering instability adopts dense-branching growth in this regime indicates that the tumbling state at the microscale makes the liquid behave isotropically at the macroscale, even for a material that exhibits global nematic ordering.…”

Section: Resultsmentioning

confidence: 99%

Section: Growth Morphology Transition Induced By Shear-enhanced Aniso...mentioning

confidence: 99%

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Dendritic patterns from shear-enhanced anisotropy in nematic liquid crystals

et al. 2023

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Controlling the growth morphology of fluid instabilities is challenging because of their self-amplified and nonlinear growth. The viscous fingering instability, which arises when a less viscous fluid displaces a more viscous one, transitions from exhibiting dense-branching growth characterized by repeated tip splitting of the growing fingers to dendritic growth characterized by stable tips in the presence of anisotropy. We controllably induce such a morphology transition by shear-enhancing the anisotropy of nematic liquid crystal solutions. For fast enough flow induced by the finger growth, the intrinsic tumbling behavior of lyotropic chromonic liquid crystals can be suppressed, which results in a flow alignment of the material. This microscopic change in the director field occurs as the viscous torque from the shear flow becomes dominant over the elastic torque from the nematic potential and macroscopically enhances the liquid crystal anisotropy to induce the transition to dendritic growth.

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Section: Resultsmentioning

confidence: 99%

Section: Growth Morphology Transition Induced By Shear-enhanced Aniso...mentioning

confidence: 99%

Dendritic patterns from shear-enhanced anisotropy in nematic liquid crystals

et al. 2023

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“…Several improvements can be considered in the reported platform. Dynamic imaging of optically anisotropic specimens is significant in various applications, such as cell dynamics 50 , contractile activity analysis of beating cardiomyocytes 51 , and liquid crystal monitoring 52 . However, the PS-IDT system developed in this study requires a relatively long acquisition time because of the use of a divergent LED light source and polarization optics.…”

Section: Discussionmentioning

confidence: 99%

Polarization-sensitive intensity diffraction tomography

Joo

Song

Kim

et al. 2022

Preprint

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Optical anisotropy, which is an intrinsic property of many materials, originates from the structural arrangement of molecular structures, and to date, various polarization-sensitive imaging (PSI) methods have been developed to investigate the nature of anisotropic materials. In particular, the recently developed tomographic PSI technologies enable the investigation of anisotropic materials through volumetric mappings of the anisotropy distribution of these materials. However, these reported methods mostly operate on a single scattering model, and are thus not suitable for three-dimensional (3D) PSI imaging of multiple scattering samples. Here, we present a novel reference-free 3D polarization-sensitive computational imaging technique—polarization-sensitive intensity diffraction tomography (PS-IDT)—that enables the reconstruction of 3D anisotropy distribution of both weakly and multiple scattering specimens from multiple intensity-only measurements. A 3D anisotropic object is illuminated by circularly polarized plane waves at various illumination angles to encode the isotropic and anisotropic structural information into 2D intensity information. These information are then recorded separately through two orthogonal analyzer states, and a 3D Jones matrix is iteratively reconstructed based on the vectorial multi-slice beam propagation model and gradient descent method. We demonstrate the 3D anisotropy imaging capabilities of PS-IDT by presenting 3D anisotropy maps of various samples, including potato starch granules and tardigrade.

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“…We provide a brief discussion of the optical design of PSIM in Materials and Methods; further details of the measurement accuracy and imaging performance of PSIM are reported in ref. 58.…”

Section: Significancementioning

confidence: 99%

Structures and topological defects in pressure-driven lyotropic chromonic liquid crystals

Zhang

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Lyotropic chromonic liquid crystals are water-based materials composed of self-assembled cylindrical aggregates. Their behavior under flow is poorly understood, and quantitatively resolving the optical retardance of the flowing liquid crystal has so far been limited by the imaging speed of current polarization-resolved imaging techniques. Here, we employ a single-shot quantitative polarization imaging method, termed polarized shearing interference microscopy, to quantify the spatial distribution and the dynamics of the structures emerging in nematic disodium cromoglycate solutions in a microfluidic channel. We show that pure-twist disclination loops nucleate in the bulk flow over a range of shear rates. These loops are elongated in the flow direction and exhibit a constant aspect ratio that is governed by the nonnegligible splay-bend anisotropy at the loop boundary. The size of the loops is set by the balance between nucleation forces and annihilation forces acting on the disclination. The fluctuations of the pure-twist disclination loops reflect the tumbling character of nematic disodium cromoglycate. Our study, including experiment, simulation, and scaling analysis, provides a comprehensive understanding of the structure and dynamics of pressure-driven lyotropic chromonic liquid crystals and might open new routes for using these materials to control assembly and flow of biological systems or particles in microfluidic devices.

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Single-Shot Quantitative Polarization Imaging of Complex Birefringent Structure Dynamics

Cited by 16 publications

References 53 publications

Dendritic patterns from shear-enhanced anisotropy in nematic liquid crystals

Dendritic patterns from shear-enhanced anisotropy in nematic liquid crystals

Polarization-sensitive intensity diffraction tomography

Structures and topological defects in pressure-driven lyotropic chromonic liquid crystals

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