Journal of Applied Physics,
Journal Year:
2023,
Volume and Issue:
133(18)
Published: May 9, 2023
To
avoid
being
detected
by
radar,
it
is
necessary
to
reduce
stealthy
military
platforms'
radar
cross
section
(RCS).
The
operation
of
overlaying
the
metasurface
(MS)
on
targets
a
good
solution.
A
simple
chessboard
MS
structure
that
can
achieve
low
RCS
over
large
bandwidth
proposed.
Only
one
unit
cell
used
construct
MS.
First,
working
in
0.5
and
1−λ
modes
designed
stable
phase
difference
180°
for
y-
x-polarized
waves.
Then,
cells
rotated
ones
are
form
with
different
distributions.
compared
results
show
2
×
quadrants
facilitate
widest
10
dB
reduction
band
111%
largest
reduction.
proposed
exhibits
excellent
even
when
irradiated
waves
at
an
oblique
incidence
30°.
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.
Advanced Theory and Simulations,
Journal Year:
2023,
Volume and Issue:
6(6)
Published: April 25, 2023
Abstract
In
this
paper,
a
simple
design
of
an
ultrathin
and
ultra‐broadband
single‐layer
MS
based
on
double‐arrow‐shaped
resonator
(DASR)
structure
for
both
transmission
reflection
modes
in
terahertz
(THz)
region
is
presented.
The
composed
periodic
array
the
combination
metal
DASR
complementary
circular
patch
(CCP)
adhered
dielectric
substrate.
Numerical
results
show
that
can
convert
CP
wave
to
its
orthogonal
component
after
simultaneously,
corresponding
amplitudes
are
≈0.45
average
from
0.45
1.75
THz
with
relative
bandwidth
118.2%,
which
conversion
efficiency
closing
theoretical
limit
(25%)
structure.
Furthermore,
0–2π
phase
shifts
reflected
transmitted
be
achieved
simultaneously
by
adjusting
oriented
angle
(α)
along
propagation
direction.
For
concept
proofs,
beams
deflection,
vortex
beam
generation,
focusing
effect
demonstrated
numerically.
provide
new
possibilities
potential
develop
multifunctional
full‐space
devices.
Journal of Physics D Applied Physics,
Journal Year:
2024,
Volume and Issue:
58(3), P. 035106 - 035106
Published: Oct. 18, 2024
Abstract
In
this
paper,
a
novel
temperature
tunable
terahertz
(THz)
broadband
filter
based
on
hybridized
vanadium
dioxide
(VO
2
)
metasurface
(MS)
was
proposed.
The
designed
MS
is
composed
of
subwavelength
metallic
square-grid
structure
situated
between
two
layers
square-patch
integrated
with
VO
film
pad
spaced
dielectric
substrate.
Utilizing
the
insulator-metal
phase
transition
characterizations
in
THz
regime,
operation
mode
proposed
accomplishes
transmission-to-reflection
transition.
Simulation
results
show
that
when
insulating
state
lower
external
temperature,
behaves
like
transparent
window
and
transmittance
above
80%
over
frequency
range
0.66–1.12
THz.
However,
undergoes
higher
becomes
low-transmission
shielding
exhibiting
below
10%
across
spectrum
from
0.56
to
1.4
physical
mechanism
illustrated
by
introducing
impedance
matching
theory,
equivalent
circuit
model
field
analysis.
addition,
offers
exceptional
angular
stability
polarization
insensitivity,
opening
up
new
opportunities
for
utilization
energy
selective
surface
applications.
