Electrically Switchable Multi‐Stable Topological States Enabled by Surface‐Induced Frustration in Nematic Liquid Crystal Cells
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 10, 2025
Abstract
In
liquid
crystal
(LC)
cells,
the
surface
patterning
directs
self‐assembly
of
uniaxial
building
blocks
in
bulk,
enabling
design
stimuli‐response
optical
devices
with
various
functionalities.
The
combination
different
anchoring
patterns
at
both
substrates
can
lead
to
induced
frustration,
preventing
a
purely
planar
and
defect‐free
configuration.
cells
crossed
assembly
rotating
patterns,
elastic
deformations
allow
obtain
bulk
configuration,
but
an
electrical
stimulus
induce
disclination
lines.
network
is
preserved
without
applied
voltage.
Depending
on
electric
field
treatment
geometrical
parameters,
multi‐stable
states
disclinations
are
obtained.
This
demonstrated
help
dual‐frequency
LCs,
for
which
frequency
dependent
dielectric
properties
repeatable
switching
between
states.
Topological
protection
associated
energy
barrier
explains
observed
metastability.
obtained
configurations
retrieved
Q‐tensor
simulations
validity
confirmed
by
matching
experimentally
microscopy
images.
realized
topological
interact
differently
light,
resulting
distinct
properties.
Optimization
allows
switch
highly
transparent
state
opaque
state,
opening
up
opportunities
smart
windows
low
consumption.
Язык: Английский
Self-assemblies of Two Ring Salicylaldimine at Low Temperatures: Mesophase Behaviour and DFT Investigations
Journal of Molecular Structure,
Год журнала:
2025,
Номер
unknown, С. 141742 - 141742
Опубликована: Фев. 1, 2025
Язык: Английский
3D Printed Optics Achieves Broadband Structured Light
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 28, 2025
Abstract
Structured
light
has
gained
in
popularity
of
late,
fueled
by
a
toolbox
for
arbitrary
control
light's
many
degrees
freedom.
Although
this
is
very
sophisticated
and
diverse,
it
still
primarily
centered
on
single
wavelength
digitally
controlled
structured
light,
only
recently
expanding
into
broadband
modes.
Here,
tools
are
combined
from
Fourier
optics
with
recent
advances
grayscale
3D
nano‐printing
optical
materials
to
design
fabricate
micro‐optical
elements
the
creation
beams
phase‐only
full
complex
amplitude
modulation.
Importantly,
approach
allows
device
at
later
use
non‐design
operation,
as
well
multiple
wavelengths
simultaneously,
which
demonstrate
across
≈200
nm
bandwidth.
A
myriad
created
produce
orbital
angular
momentum,
Hermite–Gaussian,
Laguerre–Gaussian
beams,
measured
purities
94%
−
100%
range,
wavelengths.
This
work
provides
compact,
simple
cost‐efficient
tool
spatial‐spectrum
light.
Язык: Английский
Next-generation interfaces: integrating liquid crystal technologies in augmented and virtual reality – A review
Liquid Crystals Reviews,
Год журнала:
2024,
Номер
12(1), С. 30 - 56
Опубликована: Янв. 2, 2024
Язык: Английский
Programmable Multi-Wavelength Distributed Feedback Laser Array Integrated in Liquid Crystal Polymer Waveguide
Optics Letters,
Год журнала:
2024,
Номер
49(20), С. 5707 - 5707
Опубликована: Сен. 16, 2024
Liquid
crystal
(LC)
distributed
feedback
(DFB)
lasers
hold
significant
potential
for
integrated
photonics
applications.
However,
limitations
in
wavelength
spacing
switching,
device
size,
and
compatibility
with
other
technologies
have
impeded
advancements
of
the
LC
DFB
laser
integration
responsiveness.
Herein,
we
propose
a
thin-film
multi-wavelength
array
utilizing
high-resolution
patterned
programmable
nematic
polymers,
enabling
rapid
switching
between
division
multiplexing
channels
while
maintaining
stable
single
longitudinal
mode
(SLM)
each
laser.
The
underlying
physical
mechanism
involves
modulating
effective
refractive
index
by
varying
molecules’
orientation
angles
adjacent
regions
grating
to
achieve
modulation.
Additionally,
specialized
waveguide
design
connects
lasers,
facilitating
modulation
as
well
straight-line
bending
propagation
Furthermore,
demonstrates
relatively
low
energy
threshold,
its
applications
high-integration
scenarios.
Язык: Английский
Liquid‐Crystal‐Powered Metasurfaces for Electrically and Thermally Switchable Photorealistic Nanoprinting and Optical Security Platform
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 30, 2024
Abstract
Active
or
reconfigurable
metasurfaces
have
been
considered
a
promising
paradigm
for
dynamic
structural
coloration
and
are
starting
to
find
their
way
into
the
ultra‐compact
integrated
optical
display
color
printing
platforms.
Generally,
an
ideal
platform
requires
full
hue‐saturation‐brightness
(HSB)
control,
high
switching
contrast,
simple
operation
manner.
Unfortunately,
date,
it
remains
challenging
simultaneously
achieve
all
these
features
using
previous
approaches.
Here,
novel
electrically
thermally
switchable
reflective
nanoprinting
is
reported
by
integrating
polarization‐sensitive
silver
nanogroove
arrays
with
twisted
nematic
LC
cell.
Compared
conventional
LC‐assisted
nanoprinting,
device
can
superior
purity,
wider
gamut,
higher
contrast.
Moreover,
through
implementation
of
sub‐pixels
scheme,
arbitrary
colors
in
gamut
be
created
mixture
red,
green,
blue
(RGB)
channels
at
different
ratios.
As
proof
concept,
photorealistic
HSB
control
pixel
density
(>4,000
pixels
per
inch)
as
well
information
steganography
demonstrated,
suggesting
that
possesses
great
potential
security
applications.
Язык: Английский