Photonics Research,
Год журнала:
2024,
Номер
12(10), С. 2207 - 2207
Опубликована: Июль 23, 2024
Quasi-bound
states
in
the
continuum
(quasi-BICs)
offer
an
excellent
platform
for
flexible
and
efficient
control
of
light-matter
interactions
by
breaking
structural
symmetry.
The
active
quasi-BIC
device
has
great
application
potential
fields
such
as
optical
sensing,
nonlinear
optics,
filters.
Herein,
we
experimentally
demonstrate
terahertz
(THz)
induced
polarization
conversion
a
liquid
crystal
(LC)-integrated
metasurface,
which
consists
symmetrically
broken
double-gap
split
ring
resonator
(DSRR),
LC
layer,
double
graphite
electrodes.
In
process
orientation
under
external
field,
realizes
from
OFF
state
to
ON
state.
state,
no
effect,
behaves
non-resonant
state;
but
exhibits
obvious
resonance.
Furthermore,
achieve
asymmetric
transmission
based
on
polarization-induced
modulation
precisely
at
resonance
position,
its
isolation
can
be
controlled
field.
study
dynamic
LC-integrated
metasurface
introduces
very
promising
route
THz
devices,
guarantees
applications
communications,
switching,
sensing
systems.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 15, 2025
Abstract
Carbon
nanotubes
(CNTs)
produced
by
the
floating‐catalyst
chemical
vapor
deposition
(FCCVD)
method
are
among
most
promising
nanomaterials
of
today,
attracting
interest
from
both
academic
and
industrial
sectors.
These
CNTs
exhibit
exceptional
electrical
conductivity,
optical
properties,
mechanical
resilience
due
to
their
binder‐free
low‐defect
structure,
while
FCCVD
enables
continuous
scalable
synthesis.
Among
methodological
variations,
aerosol
CVD’
is
distinguished
its
production
freestanding
thin
films
comprising
macroscale
CNT
networks,
which
superior
performance
practical
applicability.
This
review
elucidates
complex
interrelations
between
CVD
reactor
synthesis
conditions
resulting
properties
CNTs.
A
unified
approach
connecting
all
stages
process
proposed
as
a
comprehensive
guide.
examines
correlations
structural
parameters
(length
diameter)
resultant
film
(conductivity,
optical,
characteristics)
establish
framework
for
optimizing
The
analysis
encompasses
characterization
methodologies
specific
CVD‐synthesized
evaluates
how
influence
applications
across
diverse
domains,
energy
devices
optoelectronics.
concludes
addressing
current
challenges
prospects
in
this
field.
Recent
advancements
in
gas
sensing
technologies
have
significantly
enhanced
the
detection
and
monitoring
of
gases
across
various
applications,
including
environmental
protection
industrial
safety.
This
paper
presents
a
novel
metasurface-based
sensor
design
that
integrates
advanced
two-dimensional
materials,
such
as
graphene,
copper,
MXene,
to
achieve
high
sensitivity
selectivity
terahertz
detection.
The
proposed
architecture
features
central
circular
resonator
surrounded
by
square
ring
resonator,
optimized
for
plasmonic
modes,
an
additional
gold-coated
amplify
capabilities.
Through
comprehensive
modeling
simulation,
sensor’s
performance
was
optimized,
demonstrating
remarkable
with
peak
value
800
GHz/RIU
robust
responses
concentrations.
Moreover,
implementation
polynomial
regression
models
further
demonstrates
relationship
between
structural
parameters
performance,
achieving
perfect
predictive
accuracy
(R2
=
1.00).
results
indicate
this
innovative
not
only
addresses
growing
demand
efficient
solutions
but
also
sets
stage
future
developments
technology,
implications
healthcare
diagnostics
monitoring.
Light Science & Applications,
Год журнала:
2025,
Номер
14(1)
Опубликована: Янв. 1, 2025
Abstract
Boasting
superior
flexibility
in
beam
manipulation
and
a
simpler
framework
than
traditional
phased
arrays,
terahertz
metasurface-based
arrays
show
great
promise
for
5G-A/6G
communication
networks.
Compared
with
the
reflective
reconfigurable
intelligent
surface
(reflective
RIS),
transmissive
RIS
(TRIS)
offers
more
feasibility
transceiver
multiplexing
systems
to
meet
growing
demand
high-performance
tracking
radar
systems.
However,
TRIS
encounters
greater
challenges
phase
shift,
efficiency,
complex
circuitry.
Here,
we
propose
sub-terahertz
based
on
shift
via
Pancharatnam-Berry
(PB)
metasurface
self-on-off
keying
(OOK)
modulation
Schottky
diodes.
The
electrically
unit
cell
consists
of
column-wise
resonator
rectangular
slot.
An
experimental
retrieved
equivalent
lumped-element
circuit
model
is
implemented
joint
field-circuit
simulations
validated
by
experiments.
A
fabricated
prototype
demonstrates
excellent
performance
minimum
insertion
loss
2.8
dB
operational
states,
large
bandwidth
nearly
covering
entire
W-band
1-bit
deep
OOK
amplitude
12
dB,
wide
scanning
range
±60°
low
specular
transmission.
We
further
implement
an
integrated
platform
combining
high-speed
steering
spatial-light
modulation,
verifying
point-to-point
signal
transmissions
different
directions
using
platform.
proposed
cost-effective
fabrication
makes
it
promising
solution
minimalist
systems,
radar,
satellite
IEEE Access,
Год журнала:
2024,
Номер
12, С. 23782 - 23797
Опубликована: Янв. 1, 2024
One
significant
aspect
of
5G
networks
involves
expanding
radio
access
into
the
millimeter-wave
spectrum.
However,
demand
for
higher
throughput
from
emerging
services
necessitates
utilisation
Terahertz
(THz)
This
transition
introduces
interdisciplinary
challenges
to
wireless
communication
stacks,
influencing
network
modelling
and
deployment,
with
Artificial
Intelligence
(AI)
playing
a
key
role.
The
THz
spectrum
Federated
Learning
(FL)
represent
new
concepts
gaining
traction
in
6G
paradigm
as
advanced
AI.
FL
is
decentralised
approach,
emphasizing
data
confidentiality
security
within
networks.
spectrum,
between
0.1
10
THz,
crucial
ultra-broadband
systems
beyond
5G,
offering
high
rates
through
wide
bandwidth.
Broadband
using
waves
over
short
distances
fixed
links
holds
promise,
functioning
optical
bridges
or
alternatives
challenging
environments.
300
900
GHz
range
potential
due
its
bandwidth
expected
commercial
circuits,
making
it
valuable
high-speed
video
transmission.
While
lower-frequency
signals
travel
longer
penetrate
buildings,
millimetre
have
limited
penetration
free-space
path
loss
molecules
water
droplets.
Despite
these
challenges,
technology
can
densely
pack
links,
maximizing
usage
enhancing
transmission
security.
article
briefly
overviews
communication,
discussing
applications
future
directions.
It
conducts
comprehensive
analysis,
comparing
microwave
mm-wave
spectra
terms
propagation,
weather
effects,
link
budget
calculations.
suitability
evaluated,
particularly
1
km
distances,
an
emphasis
on
specific
requirements.
investigates
properties
estimates
achievable
while
maintaining
generality
simplified
assumptions
equations.
We
propose
leveraging
largely
untapped
frequency
band
enhance
communication.
In
healthcare
sector,
we
introduce
FL,
relying
backhaul
infrastructure
THz-based
Virtual
Private
Network
(VPN).
Hospitals
are
identified
designated
end-users
who
employ
private
service
providers'
privacy
efficiency.
establishes
foundation
utilizing
backhaul,
VPN,
introducing
novel
architecture
support
secure
cross-silo
focusing
improvement.
