Electromagnetics,
Год журнала:
2024,
Номер
44(1), С. 57 - 71
Опубликована: Янв. 2, 2024
In
this
paper,
a
full-space
multifunctional
coding
metasurface
(MS)
with
reflection
and
transmission
integration
is
proposed
to
realize
the
independent
manipulation
of
electromagnetic
waves
at
two
different
frequencies.
The
unit
consists
layers
dielectric
substrate
three
metal
patch,
upper
reflective
layer
composed
ring
split
(URSR),
middle
groove
(MSR),
lower
(LSR).
mode
works
13.4
GHz,
incoming
linear
polarization
(LP)
beam
deflection
angle
34°.
While
17.9
focusing
achieved
under
action
circular
(CP)
waves.
order
verify
feasibility
design,
circularly
polarized
antenna
placed
80
mm
in
-Z
direction,
gain
increases
from
7.5
dB
22.5
dB.
Meanwhile
microstrip
antennas
fabricated
measured,
results
are
consistent
simulation
results.
method
provides
possibility
high-rate
information
devices
communication
systems.
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Май 15, 2024
Abstract
In
recent
years,
there
has
been
notable
advancement
in
programmable
metasurfaces,
primarily
attributed
to
their
cost-effectiveness
and
capacity
manipulate
electromagnetic
(EM)
waves.
Nevertheless,
a
significant
limitation
of
numerous
available
metasurfaces
is
capability
influence
wavefronts
only
reflection
mode
or
transmission
mode,
thus
catering
half
the
spatial
coverage.
To
best
our
knowledge
for
first
time,
novel
graphene-assisted
reprogrammable
metasurface
that
offers
unprecedented
independently
concurrently
EM
waves
within
both
half-spaces
introduced
THz
frequency
band.
This
intelligent
achieves
wavefront
control
concurrent
reflection-transmission
all
same
polarization
channel.
The
meta-atom
constructed
with
two
graphene
sections,
enabling
straightforward
modification
wave
behavior
by
adjusting
chemical
potential
distribution
each
segment
via
an
external
electronic
source.
proposed
functionalities
encompass
various
modes,
including
single
dual
beam
simultaneous
beams
mode-direct
transmission,
vice
versa,
steering
mode-dual
simultaneously.
expected
be
due
manipulation
separately
continuously
applications
such
as
imaging
systems,
encryption,
miniaturized
next-generation
wireless
communications.
Applied Optics,
Год журнала:
2022,
Номер
61(16), С. 4833 - 4833
Опубликована: Апрель 27, 2022
In
this
paper,
an
all-metal
metasurface
(MS),
which
can
achieve
high-efficient
reflective
circular-polarization
conversion
and
multifunctional
terahertz
(THz)
wavefront
manipulation
in
ultra-broadband
frequency
range,
is
proposed
investigated
theoretically.
The
MS
consists
of
the
periodic
array
a
gold
vertical-split-ring
(VSR)
structure
adhered
on
substrate.
Numerical
simulation
results
indicate
that
convert
incident
(CP)
wave
into
its
orthogonal
component
after
reflection
with
coefficient
over
95%
from
0.8
to
1.65
THz
(relative
bandwidth
68.3%).
full
2π
phase
shift
range
be
obtained
by
changing
rotation
angle
VSR
along
propagation
direction.
As
proof
concept
for
manipulation,
anomalous
reflection,
planar
focusing,
vortex
beam
generation
are
numerically
demonstrated
based
Pancharatnam-Berry
(PB)
principle.
Our
work
provide
effective
method
enhancing
performance
reflective-type
show
endless
potential
communication
applications
even
optical
region.
Optical Engineering,
Год журнала:
2024,
Номер
63(02)
Опубликована: Фев. 8, 2024
Drawing
upon
the
principles
of
digital
coding
metasurfaces,
we
propose
double-split
ring
resonators
metasurface
that
can
switch
between
different
frequency
bands
with
varying
amplitudes.
Under
transverse-magnetic
(TM)
polarized
terahertz
wave
incidence,
same
meta-atom
structure
utilizes
amplitude
to
achieve
spatial
imaging
functionality.
Due
limitations
in
device
size
and
fabrication
techniques,
actively
controlled
metasurfaces
range
are
rare.
In
order
enhance
flexibility
a
phase-change
material,
vanadium
dioxide
(VO2),
is
introduced
for
active
control
within
structure.
The
functionality
be
switched
by
single
switching
metasurface,
achieved
phase
transition
characteristics
insulating
metallic
states
VO2.
Therefore,
designed
which
based
on
influence
VO2
amplitude,
provides
new
approach
flexible
waves.
It
holds
great
prospects
significant
applications
transmission,
communication,
other
emerging
terahertz-related
fields.
IEEE Photonics Technology Letters,
Год журнала:
2023,
Номер
35(5), С. 245 - 248
Опубликована: Янв. 4, 2023
Airy
beams
in
microwave
and
optical
region
have
gained
wide
attention
of
researchers
due
to
their
remarkable
non-diffractive,
self-bending
self-healing
properties.
However,
the
analysis
terahertz
wave
band
is
less.
In
this
letter,
we
proposed
an
beam
multifunctional
metasurface
which
can
achieve
multiple
functions
under
different
polarized
waves.
Under
linearly
waves
incidence,
designed
generate
autofocusing
beam.
Meanwhile,
same
also
realize
diversified
including
focusing,
multi-vortex
beam,
focusing
vortex
circularly
incidence.
Our
presented
structure
has
potential
applications
important
scenarios
such
as
biomedicine,
imaging,
holography,
devices.
IEEE Transactions on Antennas and Propagation,
Год журнала:
2023,
Номер
71(11), С. 8854 - 8861
Опубликована: Июль 17, 2023
Reconfigurable
coding
metamaterial
is
created
by
combining
metamaterials
with
traditional
microwave
absorbers.
Using
3-D
printing,
two
elements
a
specific
phase
difference
are
assembled
into
jigsaw-like
metamaterial.
The
3-D-printed
element
shells
and
insertable
bottom
plate
make
absorbers
reconfigurable,
while
incorporating
certain
differences
imbues
them
the
scattering
characteristics
of
metamaterials.
This
combination
reconfigurability
allows
for
flexible
regulation
absorption
in
different
frequency
ranges.
By
adjusting
ratio
elements,
bands
can
be
optimized
radar
cross
Section
(RCS)
reduction.
When
1
to
total
number
0.625,
reconfigurable
demonstrates
RCS
reduction
below
−10
dB
throughout
5.3–18-GHz
range.
Our
work
provides
promising
extensible
direction
developing
stealth
technology.
