Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Май 2, 2025
In
this
study,
a
coded
metasurface
design
employing
the
Pancharatnam-Berry
(PB)
phase
principle
was
proposed,
with
precise
beam
steering
achieved
via
gradient
variations.
The
designed
metasurfaces
have
characteristics
of
flexibility
and
transparency.
unit
uses
modified
C
structure
to
form
dual-resonant
points
wide
frequency
band,
PB
satisfy
relationship
between
rotation
angle
element
double
difference
reflected
phase,
by
encoding
arrays,
functions
such
as
reducing
linearly
polarized
radar
cross
sections
(RCS)
circularly
beams
can
be
achieved.
array
effectively
reduces
linear
polarization
RCS
in
13-20
GHz
band
rotating
metasurfaces.
Under
plane
wave
excitation,
achieves
high
conversion
ratio
(PCR)
approximately
0.9
within
14-25
band.
Experimental
results
show
that
±
50°
wide-angle
along
both
X-
Y-axes
while
maintaining
82%
visible-light
transmittance,
providing
potential
applications
flexible
electronics
reconfigurable
intelligent
surfaces
(RIS).
Optics Express,
Год журнала:
2024,
Номер
32(18), С. 31107 - 31107
Опубликована: Авг. 5, 2024
Accurately
aligning
liquid
crystal
molecules
into
predetermined
spatially
variant
orientations
is
crucial
for
fabricating
devices
such
as
flat
optical
elements,
soft
actuators
and
robots.
Despite
the
developments
of
various
photopatterning
techniques
this
purpose,
limits
their
spatial
resolutions
have
been
rarely
addressed.
In
study,
we
delve
physical
constraints
governing
two
prominent
methods:
single
exposure
to
light
fields
with
structured
polarizations
multi-exposures
intensities.
Theoretical
analyses
show
that
minimal
grating
period
first
method
only
half
Abbe
limit
an
intensity
imaging
system,
second
system
can
surpass
Rayleigh
limit.
Experimental
studies
demonstrate
unprecedent
high
resolution
periods
1
µm.
We
further
establish
core
size
in
photopatterned
singular
topological
defects
linearly
proportional
charge
these
yield
less
than
µm
defect
cores
are
demand
applications
coronagraphs.
Heading
toward
the
next-generation
intelligent
optical
device,
meta-optics
active
tunability
is
one
of
most
desirable
properties
to
expand
its
versatility
beyond
traditional
devices.
Despite
advances
via
various
tunable
approaches,
encoding
freedom
tuning
capability
still
critically
restricts
widespread
engagement
and
dynamics
in
real-life
applications.
Here,
we
present
a
gesture-interactive
scheme
by
topography
flexible
metasurfaces
(TFMs)
for
capability.
Through
regulating
different
surface
topographies,
potential
degree
(DoF)
has
been
fully
explored
dynamically
display/encrypt
up
16
independent
holographic
images,
exceeding
state-of-the-art
DoF.
Such
flexibility
interactively
tuned
with
gesture
triggers,
manual
bending,
other
large-area
repeatable
controlling
methods
extract
display
respective
images.
We
envision
that
this
research
stimulates
meta-device
innovation
suggests
applications
interactive
displays,
information
storage
encryption,
wearable
Dalton Transactions,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Here,
we
propose
an
effective
solar
absorber
utilizing
Ti
and
GaAs.
The
average
absorption
efficiency
of
this
structure
reaches
97.6%
in
the
wavelength
range
280–3000
nm.
This
is
found
to
exhibit
excellent
thermal
radiation
performance.
Abstract
Augmented
and
virtual
reality
(AR/VR)
is
transforming
how
humans
interact
with
technology
in
a
wide
range
of
fields
industries,
from
healthcare
education
to
entertainment.
However,
current
device
limitations
have
impeded
wider
integration.
Tunable
holographic
metasurfaces
represent
promising
platform
for
revolutionizing
AR/VR
devices
by
precisely
controlling
light
at
the
subwavelength
scale.
This
article
examines
challenges
opportunities
both
metamaterial
perspectives
explores
improvements
state-of-the-art
approaches
can
address
these
challenges.
In
particular,
we
propose
focus
on
easily
manufacturable
broadly
electrically
tunable
metasurface
technologies
including
liquid
crystal
integration
excitonic
tuning
2D
materials.
Advanced
optimization
techniques
machine
learning
will
also
be
crucial
exploring
large
design
space.
Coatings,
Год журнала:
2025,
Номер
15(2), С. 243 - 243
Опубликована: Фев. 19, 2025
As
a
widely
used
clean
energy
source,
solar
has
demonstrated
significant
promise
across
various
applications
due
to
its
wide
spectral
range
and
efficient
absorption
performance.
This
study
introduces
cross-structured,
ultra-broadband
absorber
utilizing
titanium
(Ti)
dioxide
(TiO2)
as
foundational
materials.
The
exhibits
over
90%
within
the
280–4000
nm
wavelength
surpasses
95%
in
broader
spectrum
from
542
3833
through
cavity
coupling
effect
of
incident
light
excitation
subsequent
initiation
surface
plasmon
resonance
mechanism,
thus
successfully
achieving
goal
broadband
high
absorption.
Through
finite
difference
time
domain
method
(FDTD)
simulation,
average
efficiency
reaches
97.38%
280
4000
nm,
it
is
97.75%
nm.
At
air
mass
1.5
(AM
1.5),
97.46%,
loss
2.54%,
which
extremely
efficiency.
In
addition,
thanks
material
considerations,
adopts
variety
high-temperature
resistant
materials,
making
thermal
radiation
environment
still
good;
specifically,
at
temperature
900
K,
can
reach
97.27%,
extreme
1800
K
temperature,
maintain
97.52%
radiation,
further
highlighting
excellent
stability
comprehensive
structure
optical
properties,
give
broad
applicability
an
ideal
or
emitter.
More
importantly,
insensitive
polarization
state
effectively
handle
lines
wide-angle
range.
photothermal
conversion
(Hereafter
referred
pc
efficiency)
sustain
elevated
level
under
conditions,
enables
flexibly
adapt
diverse
environmental
especially
suitable
for
integration
application
photovoltaic
systems,
broaden
potential
field
renewable
energy.
