Materials,
Journal Year:
2024,
Volume and Issue:
17(19), P. 4730 - 4730
Published: Sept. 26, 2024
The
manipulation
of
electromagnetic
waves
using
metasurfaces
is
important
in
areas
such
as
stealth
and
communication.
In
this
paper,
we
reported
on
the
use
an
element-based
polarizer
for
first
step,
which
enables
incident
to
integrate
into
cross-polarized
with
a
relative
bandwidth
88%
within
15–37.1
GHz.
Then,
eight-element
coding
metasurface
based
Pancharatnam–Berry
phase
presented
circular
polarization
anomalous
reflection.
simulated
values
show
that
our
work
can
achieve
high-efficiency
(94%)
wide-angle
(70°)
reflection
under
normal
incidence.
present
good
agreement
experimental
values.
Our
reveals
ability
manipulate
stealth.
Nanomaterials,
Journal Year:
2023,
Volume and Issue:
13(12), P. 1846 - 1846
Published: June 12, 2023
In
this
paper,
a
photo-excited
metasurface
(MS)
based
on
hybrid
patterned
photoconductive
silicon
(Si)
structures
was
proposed
in
the
terahertz
(THz)
region,
which
can
realize
tunable
reflective
circular
polarization
(CP)
conversion
and
beam
deflection
effect
at
two
frequencies
independently.
The
unit
cell
of
MS
consists
metal
circular-ring
(CR),
Si
ellipse-shaped-patch
(ESP)
circular-double-split-ring
(CDSR)
structure,
middle
dielectric
substrate,
bottom
ground
plane.
By
altering
external
infrared-beam
pumping
power,
it
is
possible
to
modify
electric
conductivity
both
ESP
CDSR
components.
varying
array
manner,
achieve
CP
efficiency
that
ranges
from
0%
96.6%
lower
frequency
0.65
THz,
89.3%
higher
1.37
THz.
Furthermore,
corresponding
modulation
depth
as
high
distinct
independent
frequencies,
respectively.
Moreover,
2π
phase
shift
also
be
achieved
by
respectively
rotating
oriented
angle
(α
Journal of the Optical Society of America B,
Journal Year:
2023,
Volume and Issue:
41(2), P. 341 - 341
Published: Dec. 15, 2023
Metasurfaces
(MSs)
are
being
extensively
researched
owing
to
their
ability
modulate
the
polarization
and
wavefront
of
electromagnetic
(EM)
waves
in
a
flexible
manner,
which
usually
offer
significant
advantages
including
ultra-thinness,
low
losses,
easy
fabrication.
However,
conventional
MSs
typically
operate
well
only
with
single
polarization.
Here,
we
propose
novel
design
strategy
for
terahertz
(THz)
reflective-mode
MS
that
relies
on
unit-cell
arrangement
combining
propagation
phase
geometric
phase.
Our
designed
can
achieve
multiple
manipulations
reflection
mode,
not
limited
circular
(CP)
transformation,
but
also
enabling
linear
(LP)
conversion.
The
consists
periodic
array
bilayered
metal
patterned
resonator
structures
sandwiched
by
dielectric
substrate.
metallic
is
made
outer
single-split-ring
(SSR)
C-shaped
slot
(CSS),
inner
double-split-ring
(DSR),
its
complementary
structure.
With
this
design,
capable
converting
LP
wave
orthogonal
counterpart
at
lower
frequency
(
f
1
=0.7THz)
after
reflection.
Additionally,
higher
2
=1.4THz),
proposed
convert
right-handed
CP
(RCP)
left-handed
(LCP)
upon
or
vice
versa.
π
full
coverage
be
achieved
independently
simultaneously
adjusting
opening
orientation
angles
SSR
based
phase,
angle
DSR
We
numerically
demonstrate
beam
deflection,
planar
focusing,
vortex
both
reflected
three
representative
provide
proof
concept.
These
findings
reveal
great
potential
multifunctional
devices
dual-polarization
imaging
communication
systems.
Nanophotonics,
Journal Year:
2024,
Volume and Issue:
13(13), P. 2391 - 2400
Published: March 21, 2024
Abstract
Camouflage
is
a
common
technique
in
nature,
enabling
organisms
to
protect
themselves
from
predators.
The
development
of
novel
camouflage
technologies,
not
only
fundamental
science,
but
also
the
fields
military
and
civilian
applications,
great
significance.
In
this
study,
we
propose
new
type
deep-subwavelength
four-layered
meta-coating
consisting
Si,
Bi,
Cr
top
bottom
with
total
thickness
∼355
nm
for
visible-infrared
compatible
camouflage.
visible
color
infrared
emission
properties
can
be
independently
adjusted.
Colorful
obtained
by
changing
Si
layer,
while
selective
high
emissivity
non-atmospheric
window
remains.
Due
properties,
shows
angle
tolerance
both
regions.
capability
our
proposed
region
validated
under
different
environments.
deep-subwavelength,
angular
insensitivity,
compatibility
large-area
fabrication
feasibility
promise
an
effective
solution
various
applications
such
as
weapons
anti-counterfeiting.
Materials,
Journal Year:
2024,
Volume and Issue:
17(15), P. 3730 - 3730
Published: July 27, 2024
In
this
paper,
a
single-feed
microstrip
antenna
(MA)
equipped
with
transmission-mode
focusing
metasurface
(MS)
is
proposed
to
achieve
dual-polarization
capabilities
and
superior
high-gain
radiation
performance.
The
original-feed
MA
comprises
two
distinct
layers
of
coaxial-fed
tangential
patches,
enabling
it
emit
circular
polarization
(CP)
wave
gain
3.5
dBic
at
5.6
GHz
linear
(LP)
4
dBi
13.7
GHz.
To
improve
the
performance
MA,
transmission
MS
numerically
substantiated.
By
positioning
originally
designed
focal
point
MS,
we
create
system
capable
achieving
CP
LP
radiations
significantly
higher
gains
12.9
14.8
GHz,
respectively.
Measurements
conducted
on
fabricated
closely
align
simulation
results,
validating
effectiveness
our
approach.
This
work
underscores
significant
potential
high-speed
data
systems
offers
practical
solution
for
enhancing
in
contemporary
wireless
communication
systems.
