Metasurfaces
possess
the
ability
to
manipulate
wavefront
of
electromagnetic
waves,
but
majority
them
are
limited
single
transmission
or
reflection
mode
without
altering
their
structure.
To
address
this
limitation,
we
proposed
a
switchable
terahertz
metasurface
for
manipulation.
By
capitalizing
on
phase
transition
properties
vanadium
dioxide
(its
conductivity
changes
with
temperature),
can
work
in
controlled
by
temperature.
Additionally,
designed
8
encoding
elements
achieve
gradient
changing
shape
unit
element.
Finally,
arranged
element
create
and
switching
optical
device
beam
steering
focusing.
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 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.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Feb. 14, 2025
Grating
metasurface
is
a
structure
formed
by
combining
grating
with
metasurface,
and
high
efficiency
polarization
control
can
be
achieved
using
the
as
unit
different
rotation
angles.
By
stacking
single-layer
wave
plates
single-frequency
modulators,
broadband
modulator
multilayer
formed,
but
optimization
of
structural
parameters
more
complicated.
In
this
paper,
traditional
plate
process
improved
an
accurate
fast
nested
designed.
The
combines
theoretical
analysis
electromagnetic
simulation,
paper
uses
to
optimize
novel
trilayer
silicon
plate,
which
capable
achieving
achromatic
conversion
from
linear
polarized
left-handed
circularly
within
0.8-1.8
THz.
analyzing
factors
affecting
performance
field,
it
concluded
that
capability
originates
anisotropy
structures,
while
enhancement
wavevector
coupling
between
structures
resonance
effect
layers.
Finally,
we
also
discuss
fabrication
structured
plates.
study
in
provides
innovative
exploration
plates,
important
for
future
design
ultrabroadband
Advanced Optical Materials,
Journal Year:
2022,
Volume and Issue:
11(2)
Published: Nov. 17, 2022
Abstract
Achieving
broadband
multitasked
integration
on
an
ultrathin
interface
is
pivotal
to
increasing
data
capacity.
However,
bifunctional
metasurfaces
exhibiting
high‐efficiency
and
crosstalk‐free
characteristics
are
rarely
seen.
Here,
three
spin‐decoupled
criteria
developed
design
the
meta‐atoms
of
metasurfaces.
Specifically,
six
dipole‐loaded
quasi‐I‐shaped
proposed
satisfy
in
radio
band
from
8.6
17.8
GHz
(about
70%
bandwidth)
with
more
than
90%
efficiency.
The
metasurface
equipped
can
keep
dispersionless
phase
gradients
two
orthogonal
circular
polarizations.
This
work
demonstrates
scheme
metasurface,
yielding
independent
multimode
vortex
beams
completely
decoupled
helicities.
Besides,
other
possible
applications
illustrated
perspective
half‐wave
plant
(polarization
control).
Accordingly,
multitasked‐type
fabricated
achieve
different
functionalities:
polarization
conversion
full‐polarization
anomalous
refraction.
schemes
offer
broadband,
polarization‐multiplexing,
multitasked‐integration
routes
for
complex
electromagnetic
wave
manipulations
within
a
subwavelength
thickness,
which
stimulate
development
electromagnetic/optical
devices
multiplexing
techniques.
