2021 Cross Strait Radio Science and Wireless Technology Conference (CSRSWTC),
Journal Year:
2023,
Volume and Issue:
unknown, P. 1 - 3
Published: Nov. 10, 2023
In
this
article,
a
transmissive
metasuiface(MS)
that
can
independently
control
the
transmission
phase
and
amplitude
of
linearly
polarized
wave
is
proposed.
The
MS
element
consists
single-substrate
two
layers
metal.
It
achieves
360°
coverage
while
maintaining
high
amplitude.
Based
on
element,
phase-modulated
antenna
operating
at
14.5
GHz
designed,
achieving
gain
21.7
dB.
Building
upon
first
antenna,
modulation
used
to
improve
sidelobe
level
(SLL)
$\boldsymbol{yoz}$
plane.
Compared
with
phase-control
MS,
amplitude-phase
controlled
attains
approximately
6
dB
SLL
suppression
by
sacrificing
1.4
main-lobe
gain.
proposed
offers
advantages
such
as
simple
structure,
low
profile,
Sensors,
Journal Year:
2022,
Volume and Issue:
22(17), P. 6483 - 6483
Published: Aug. 28, 2022
The
paper
proposes
an
ultra-narrow
band
graphene
refractive
index
sensor,
consisting
of
a
patterned
layer
on
the
top,
dielectric
SiO2
in
middle,
and
bottom
Au
layer.
absorption
sensor
achieves
efficiency
99.41%
99.22%
at
5.664
THz
8.062
THz,
with
bandwidths
0.0171
0.0152
respectively.
Compared
noble
metal
absorbers,
our
absorber
can
achieve
tunability
by
adjusting
Fermi
level
relaxation
time
geometry
unchanged,
which
greatly
saves
manufacturing
cost.
results
show
that
has
properties
polarization-independence
large-angle
insensitivity
due
to
symmetric
structure.
In
addition,
practical
application
testing
content
hemoglobin
biomolecules
was
conducted,
frequency
first
resonance
mode
shows
shift
0.017
second
0.016
demonstrating
good
sensitivity
sensor.
S
(sensitivities)
were
calculated
875
GHz/RIU
775
GHz/RIU,
quality
factors
FOM
(Figure
Merit)
are
26.51
18.90,
respectively;
minimum
limit
detection
is
0.04.
By
comparing
previous
similar
sensors,
better
sensing
performance,
be
applied
photon
terahertz
band,
biochemical
sensing,
other
fields.
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.
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.
Journal of the Optical Society of America B,
Journal Year:
2023,
Volume and Issue:
40(2), P. 441 - 441
Published: Jan. 5, 2023
A
vortex
beam
carrying
orbital
angular
momentum
(OAM)
is
an
effective
way
to
increase
wireless
communication
capacity.
The
existing
terahertz
(THz)
metasurface
(MS)-based
generator
limited
operating
at
a
single
or
two
frequency
points,
and
also
has
wavelength-dependent
behavior,
thus
limiting
its
application.
Here,
transmissive
MS
proposed
generate
THz
beams
OAM
with
different
topological
charges
l=−1
,
23
(
+
)
under
left/right-handed
circular
polarization
(CP)
incidence
three
frequencies.
mode
purity
of
the
generated
all
orders
greater
than
60%
CP
wave
0.6
THz,
0.857
1.892
respectively.
Both
theoretical
prediction
simulation
results
verify
that
designed
can
independently
manipulate
waves
unit-cell
structure
preferable
for
increasing
number
operation
frequencies
while
guaranteeing
manipulation
electromagnetic
waves.
compact
system
provides
ideas
fabrication
multifunctional
MS-based
devices
higher
integration
smaller
size.
Fundamental Research,
Journal Year:
2023,
Volume and Issue:
5(1), P. 124 - 131
Published: April 28, 2023
Conventional
metasurfaces
for
terahertz
polarization
are
limited
to
performing
lateral
(in
the
x-y
plane)
control
of
output
wave.
In
such
cases,
state
remains
unchanged
in
each
plane
along
propagation
path.
Herein,
we
propose
a
metasurface
that
operates
longitudinally
(i.e.,
z-axis
direction
propagation),
which
modifies
throughout
Our
designed
can
phase
delays
left-handed
and
right-handed
circularly
polarized
(LCP
RCP)
components
incident
This
enables
LCP
beam
RCP
converge
through
distinct
paths,
creating
Bessel
beam.
The
proposed
design
achieved
linearly
wave
including
both
with
precise
difference
Δφ
at
point
within
certain
range
z-axis.
varies
as
distance,
resulting
rotated
path,
while
rotation
angle
ranges
from
0
π.
Based
on
variable
property
longitudinal
polarization,
an
application
concept
dielectric
refractive
index
sensing,
additional
medium
is
placed
path
unknown
determined
by
detecting
state.
Theoretically,
device
might
find
potential
applications
media
excitation,
communication,
radar
ranging.
Frequenz,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 22, 2025
Abstract
This
paper
proposes
a
tunable
dual-band
polarization-sensitive
absorber
that
displays
two
distinct
absorptance
peaks
for
different
polarized
incident
lights.
The
proposed
uses
graphene
as
the
material
metasurface
to
utilize
its
surface
conductivity
achieving
resonant
frequency.
displayed
absorption
separately
waves.
For
x
-polarized
light,
perfect
bandwidth
of
3
THz
between
2.85
and
5.85
THz,
y
1.5
11
12.5
THz.
Numerical
computations
were
performed
with
extremely
fine
mesh
quality
study
spectrum
Fermi
energy
levels,
angles,
azimuthal
angle
incidence.
appreciative
characteristics
which
makes
it
suitable
candidate
harvesting,
polarization
detection,
conversion
unpolarized
light.
