Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors

H Agha, Y Geng, X Ma, DI Avşar… - Light: Science & …, 2022 - nature.com
The seemingly simple step of molding a cholesteric liquid crystal into spherical shape,
yielding a Cholesteric Spherical Reflector (CSR), has profound optical consequences that …

Defects and defect engineering in Soft Matter

A Jangizehi, F Schmid, P Besenius, K Kremer… - Soft Matter, 2020 - pubs.rsc.org
Soft matter covers a wide range of materials based on linear or branched polymers, gels and
rubbers, amphiphilic (macro) molecules, colloids, and self-assembled structures. These …

Liquid crystals in micron-scale droplets, shells and fibers

M Urbanski, CG Reyes, JH Noh… - Journal of Physics …, 2017 - iopscience.iop.org
The extraordinary responsiveness and large diversity of self-assembled structures of liquid
crystals are well documented and they have been extensively used in devices like displays …

Curvature-induced defect unbinding and dynamics in active nematic toroids

PW Ellis, DJG Pearce, YW Chang, G Goldsztein… - Nature Physics, 2018 - nature.com
Nematic order on curved surfaces is often disrupted by the presence of topological defects,
which are singular regions in which the orientational order is undefined. In the presence of …

Change in stripes for cholesteric shells via anchoring in moderation

L Tran, MO Lavrentovich, G Durey, A Darmon… - Physical Review X, 2017 - APS
Chirality, ubiquitous in complex biological systems, can be controlled and quantified in
synthetic materials such as cholesteric liquid crystal (CLC) systems. In this work, we study …

Prolate and oblate chiral liquid crystal spheroids

M Sadati, JA Martinez-Gonzalez, Y Zhou… - Science …, 2020 - science.org
Liquid crystals are known to exhibit intriguing textures and color patterns, with applications
in display and optical technologies. This work focuses on chiral materials and examines the …

Through the spherical looking‐glass: asymmetry enables multicolored internal reflection in cholesteric liquid crystal shells

Y Geng, JH Jang, KG Noh, JH Noh… - Advanced Optical …, 2018 - Wiley Online Library
Spheres of cholesteric liquid crystal generate dynamic patterns due to selective reflection
from a helical structure subject to continuously curved boundaries. So far the patterns are …

Amplified photon upconversion by photonic shell of cholesteric liquid crystals

JH Kang, SH Kim, A Fernandez-Nieves… - Journal of the …, 2017 - ACS Publications
As an effective platform to exploit triplet–triplet-annihilation-based photon upconversion
(TTA-UC), microcapsules composed of a fluidic UC core and photonic shell are …

Light-driven dynamic hierarchical architecture of three-dimensional self-assembled cholesteric liquid crystal droplets

X Du, F Yang, Y Liu, HF Gleeson, D Luo - Langmuir, 2023 - ACS Publications
Cholesteric liquid crystals have attracted much attention in biosensors, in communication
systems, security identification, hierarchical materials assembly, and microlasers, due to …

Helfrich-hurault elastic instabilities driven by geometrical frustration

C Blanc, G Durey, RD Kamien, T Lopez-Leon… - Reviews of Modern …, 2023 - APS
The Helfrich-Hurault (HH) elastic instability is a well-known mechanism behind patterns that
form as a result of strain upon liquid crystal systems with periodic ground states. In the HH …