Abstract
Due
to
the
powerful
capability
in
manipulating
electromagnetic
(EM)
waves,
digital
coding
and
programmable
metasurfaces
have
found
vast
application
prospects
across
numerous
areas
such
as
next‐generation
wireless
communications
holography.
Liquid
crystals
(LCs),
dielectric
materials
with
significant
birefringence
effect
over
a
wide
frequency
range,
provide
cost‐effective
solution
for
achieving
flexible
EM
manipulations,
especially
terahertz
(THz)
band.
Different
from
conventional
1D
control
single
functionality
of
transmissive
LC‐based
devices,
here,
16
×
addressable
amplitude‐phase
meta‐device
is
proposed
support
multiplexing
by
using
film
on
glass
(FOG)
technology.
Both
numerical
simulations
experimental
results
demonstrate
that
meta‐atom
exhibits
an
amplitude
modulation
depth
90%
phase
tuning
range
≈180°
at
two
distinct
frequencies,
hence
can
multifunctional
applications,
including
near‐field
printing
imaging,
3D
THz
energy
convergence,
zero‐order
Bessel
beam
generation.
The
strategy
paves
way
constructing
highly
integrated
high‐performance
information
processing
systems.
Abstract
Achieving
active
tunability
in
metasurfaces
remains
a
critical
challenge,
with
conventional
local
limited
by
dispersive
wavefront
deflection
and
broad
resonances
that
lack
spectral
selectivity.
In
contrast,
nonlocal
exhibit
high
selectivity,
offering
promising
platform
for
dynamic
functionality.
Here,
an
metasurface
exceptional
spatial
selectivity
is
experimentally
demonstrated,
leveraging
the
physics
of
bound
states
continuum
coupling
phase.
The
achieves
deflected
beam
quality
factor
22
narrow
beamwidth
5°,
focusing
energy
more
precisely
than
across
both
domains.
By
integrating
liquid
crystal
elastomer
substrate,
tunable
azimuthal
3°
4.5%
in‐plane
deformation
realized.
Furthermore,
phase
introduces
polarization‐dependent
wavevectors,
enabling
separation
orthogonal
polarization
components
while
maintaining
tunability.
This
architecture
shows
strong
potential
polarization‐division
multiplexing
demultiplexing
low
cost
environmental
adaptation,
paving
way
advanced
terahertz
devices,
such
as
signal
relays,
processors,
modulators,
transmitters,
next‐generation
wireless
communications.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 11, 2025
Heterostructures
have
promising
applications
in
photonics
and
optoelectronics,
mainly
due
to
their
high
electron
mobility
broadband
photoresponse
covering
visible,
infrared,
terahertz
(THz)
ranges.
However,
it
is
challenging
detect
heterostructures
definition
with
conventional
THz
techniques.
Here
we
demonstrate
a
nanoscopic
imaging
method
which
capable
of
resolving
the
local
response
PbS-graphene
based
upon
sophisticated
near-field
optical
microscope.
The
interaction
between
near
field
heterostructure
further
explored
by
numerical
simulations.
results
reveal
that
both
composition
structure
layers
composing
contribute
signal.
Furthermore,
develop
reliably
finite
dipole
model
suitable
for
retrieving
optoelectronic
properties
multilayered
systems
from
measured
hyperspectra,
realize
mapping
effective
permittivity
conductivity
heterostructure.
Our
work
discloses
mechanism
heterostructures,
provides
useful
high-definition
quantifying
complex
materials
devices.
Abstract
Vortex
beams
with
orbital
angular
momentum
(OAM)
exhibit
immense
potential
in
various
fields
such
as
communications,
information
processing,
and
optical
tweezers.
Nevertheless,
current
terahertz
vortex
beam
generators
still
face
challenges
including
narrow
frequency
bands,
low
efficiency,
limited
multiplexing
capabilities,
difficulties
dynamic
tuning.
Here,
the
study
introduces
a
new
electrically
controlled
multi‐channel
strategy
that
harnesses
cascaded
helical
geometric
metasurface,
liquid
crystal
(LC)
layer,
OAM‐based
metalens
to
achieve
comprehensive
independent
phase
manipulation
across
all
four
spin
channels.
Moreover,
by
employing
spin,
spatial,
OAM
multiplexing,
LC
active
control
technology,
eight
distinguishable
(SAM)‐OAM
coupling
states
are
decoded,
enabling
of
6
different
topological
charges.
Experimental
validation
reveals
remarkable
performance:
within
broadband
range
0.4–0.6
THz,
peak
excitation
efficiency
up
94%,
each
mode
purity
reaching
its
highest
level
>80%,
minimum
value
inter‐mode
crosstalk
is
<–11
dB.
This
generation
conversion
mechanism
enhances
operational
flexibility
light
field
manipulation,
breaking
through
limitations
channel
band,
pioneering
novel
avenue
for
bolstering
parallel
mitigating
inter‐channel
crosstalk.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 22, 2025
Abstract
As
there
is
a
diversification
in
indoor
communication
scenarios,
metasurfaces
with
complex‐amplitude
modulation
show
great
potential
for
improving
performances.
However,
still
face
challenges
achieving
efficient
full‐space
coverage,
multi‐channel
communication,
and
system
integration.
Here,
frequency‐spatial
multiplexed
metasurface
design
strategy
proposed
communications.
By
adjusting
the
structural
parameters
orientation
angles
of
meta‐atoms,
amplitude
phase
across
five
channels
are
jointly
tailored,
enabling
precise
wave
manipulation
to
enhance
quality
within
coverage
area.
Additionally,
designed
utilized
an
generate
different
holographic
images
at
specific
frequencies
distances,
allowing
point‐to‐point
terminals
receive
signals
perform
functions.
Meanwhile,
ultrathin
structure
single‐layer
substrate
cladded
by
two
patterned
metal
layers
facilitates
high‐density
integration
devices.
Numerical
simulations
experimental
results
validate
five‐channel
imaging,
demonstrating
its
wide‐area
wireless
data
transmission
applications,
providing
new
directions
future
technologies.
Applied Physics Letters,
Journal Year:
2025,
Volume and Issue:
126(19)
Published: May 12, 2025
Terahertz
programmable
metasurfaces
hold
significant
promise
for
next-generation
communications
due
to
their
capability
steer
electromagnetic
waves.
However,
most
existing
terahertz
operate
at
only
a
single
frequency,
leaving
much
of
the
vast
spectrum
underutilized.
In
this
study,
we
introduce
“butterfly”
dual-band
metasurface,
integrated
with
liquid
crystals,
designed
efficient
beam
steering.
By
applying
bias
voltages,
metasurface
achieves
phase
change
nearly
270°
two
distinct
frequencies,
∼400
and
∼700
GHz.
Our
experimental
results
demonstrate
that
butterfly
is
compatible
both
binary
ternary
coding
schemes
these
remarkably
enhancing
beam-steering
performance
expanding
spatial
coverage.
This
advancement
in
technology
marks
step
forward
harnessing
full
potential
spectrum,
opening
another
pathway
broadband
communication
imaging
applications.
Applied Physics Letters,
Journal Year:
2024,
Volume and Issue:
124(25)
Published: June 17, 2024
Active
metasurfaces
utilize
semiconductor
carrier
modulation,
offering
an
approach
for
spatial
light
modulation
with
advantages
in
speed,
efficiency,
and
power
consumption.
Here,
we
present
a
method
designing
programmable
that
leverage
the
plasma
dispersion
effect
of
semiconductors
to
tune
terahertz
wave
phase.
By
integrating
PN
junction
into
metasurface
unit
adjusting
relative
permittivity
through
voltage
control,
reflected
phase
can
be
effectively
manipulated.
The
designed
enables
continuous
up
270°
around
0.4
THz,
average
reflection
efficiency
30%
potential
speed
GHz
range.
Additionally,
by
configuring
different
distributions,
steer
beams
at
angles,
achieving
far-field
radiation
peak
gain
13
dB.
This
proposed
shows
great
applications
communication
imaging.
Journal of Materiomics,
Journal Year:
2024,
Volume and Issue:
11(1), P. 100904 - 100904
Published: June 20, 2024
Millimeter-wave
and
terahertz
frequency
bands
are
receiving
more
attention
due
to
their
big
potentials
for
widespread
applications
such
as
in
high-speed
communications
high-resolution
imaging.
Nevertheless,
limited
by
the
functional
materials
devices
these
bands,
we
face
lots
of
challenges
towards
high
efficiency,
precision,
multi-domain
electromagnetic
manipulations
that
urgently
required
practical
application
scenarios.
The
emergence
metasurfaces,
especially
digital
coding
metasurfaces
programmable
has
provided
powerful
capabilities
control
waves.
Recently,
with
progress
space-domain,
time-
domain,
space-time-domain,
polarization-domain
considerable
new
have
been
achieved,
including
new-architecture
wireless
communication
transmitters,
integration
sensing
communications,
simultaneous
information
power
transfers,
encryption.
Consequently,
integrated
multifunctional
platforms
based
on
expected.
In
this
review,
recent
advances
millimeter-wave
thoroughly
presented,
design
principles
methods,
next-generation
systems,
other
systems.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(32), P. 21211 - 21220
Published: July 30, 2024
In
photonics,
achieving
high-quality
(Q)
resonance
is
crucial
for
high-sensitivity
devices
used
in
applications,
such
as
switching,
sensing,
and
lasing.
However,
high-Q
resonances
are
highly
susceptible
to
internal
losses
of
plasmonic
devices,
impeding
their
integration
into
broader
systems
across
terahertz
visible
light
bands.
Here,
we
overcome
this
challenge
by
proposing
a
low-Q
metasurface
ultrasensitive
(THz)
switching
sensing.
Theoretically,
reveal
an
approach
constructing
resonator
possessing
high
sensitivity
nonradiative
losses.
Leveraging
mechanism,
design
sensitive
induced
strong
coupling
between
quasi-bound
state
the
continuum
dipole
mode.
By
hybridizing
with
germanium
layer,
metadevice
exhibits
ultralow
pump
threshold
192
μJ/cm2
ultrafast
cycle
time
7
ps.
Furthermore,
it
also
shows
224
GHz/RIU
refractive
index
The
proposed
paradigm
photonic
can
be
applied
biosensing,
wide-band
filters,
modulators.
