Transflective spin-orbital angular momentum conversion device by three-dimensional multilayer liquid crystalline materials

Many sheared liquid crystalline materials (fibers, films and moldings) exhibit a fine banded microstructure when observed in the polarized light microscope. In some cases, for example Kevlar® fiber, the periodicity is close to the resolution limit of even the highest numerical aperture objectives. The periodic microstructure reflects a non-uniform alignment of the constituent molecules, and consequently is an indication that the mechanical properties will be less than optimal. Thus it is necessary to obtain quality micrographs for characterization, which in turn requires that fine detail should contribute significantly to image formation.It is textbook knowledge that the resolution achievable with a given microscope objective (numerical aperture NA) and a given wavelength of light (λ) increases as the angle of incidence of light at the specimen surface is increased. Stated in terms of the Abbe resolution criterion, resolution improves from λ/NA to λ/2NA with increasing departure from normal incidence.

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Spinodal decomposition in liquid crystalline materials

Journal de Physique II ◽

10.1051/jp2:1991119 ◽

1991 ◽

Vol 1 (8) ◽

pp. 949-958 ◽

Cited By ~ 4

Author(s):

A. Ten Bosch

Keyword(s):

Spinodal Decomposition ◽

Liquid Crystalline ◽

Crystalline Materials ◽

Liquid Crystalline Materials

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Designing Chemically Selective Liquid Crystalline Materials that Respond to Oxidizing Gases

Journal of Materials Chemistry C ◽

10.1039/d1tc00544h ◽

2021 ◽

Author(s):

Nanqi Bao ◽

Jake Gold ◽

Tibor Szilvasi ◽

Huaizhe Yu ◽

Robert Twieg ◽

...

Keyword(s):

Computational Methods ◽

First Principles ◽

Liquid Crystalline ◽

Soft Materials ◽

Crystalline Materials ◽

Liquid Crystalline Materials ◽

Chemically Selective ◽

Kinetics Of

Computational methods can provide first-principles insights into the thermochemistry and kinetics of reactions at interfaces, but this capability has not been widely leveraged to design soft materials that respond selectively...

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Vortex states in an acoustic Weyl crystal with a topological lattice defect

Nature Communications ◽

10.1038/s41467-021-23963-7 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Qiang Wang ◽

Yong Ge ◽

Hong-xiang Sun ◽

Haoran Xue ◽

Ding Jia ◽

...

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Lattice Defect ◽

Three Dimensional ◽

Surface States ◽

Real Space ◽

Lattice Defects ◽

One Dimensional ◽

Topological Features ◽

Topological Lattice

AbstractCrystalline materials can host topological lattice defects that are robust against local deformations, and such defects can interact in interesting ways with the topological features of the underlying band structure. We design and implement a three dimensional acoustic Weyl metamaterial hosting robust modes bound to a one-dimensional topological lattice defect. The modes are related to topological features of the bulk bands, and carry nonzero orbital angular momentum locked to the direction of propagation. They span a range of axial wavenumbers defined by the projections of two bulk Weyl points to a one-dimensional subspace, in a manner analogous to the formation of Fermi arc surface states. We use acoustic experiments to probe their dispersion relation, orbital angular momentum locked waveguiding, and ability to emit acoustic vortices into free space. These results point to new possibilities for creating and exploiting topological modes in three-dimensional structures through the interplay between band topology in momentum space and topological lattice defects in real space.

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