2021 7th IEEE International Conference on Network Intelligence and Digital Content (IC-NIDC),
Год журнала:
2023,
Номер
unknown, С. 320 - 324
Опубликована: Ноя. 3, 2023
The
optical
vortex
has
a
rapidly
changing
spatial
phase
with
orbital
angular
momentum
centered
by
zero
electromagnetic
field
intensity.
It
opens
new
strategies
for
communications,
sensing,
and
imaging
systems.
Nevertheless,
generating
high-quality
vortices
at
the
appropriate
wavelengths
polarizations
is
still
challenging.
In
order
to
produce
vortices,
we
optimize
2D
grating
structure
nearly
perfect
absorption
via
inverse
design
in
this
work.
We
apply
an
design,
broad-area
computational
optimization
method,
generate
multiple
within
300
nmthick
silicon.
grating-structure-based
shows
(97.02%).
Our
maximum
purity
of
as
97.82%
mode
1
89.66%
-1,
which
can
directly
affect
quality
communication.
mechanism
may
open
strategy
highquality
communication,
many
other
applications.
Journal of the Optical Society of America B,
Год журнала:
2023,
Номер
41(2), С. 341 - 341
Опубликована: Дек. 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.
Journal of Physics D Applied Physics,
Год журнала:
2024,
Номер
58(3), С. 035106 - 035106
Опубликована: Окт. 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.
Laser & Photonics Review,
Год журнала:
2024,
Номер
18(8)
Опубликована: Март 24, 2024
Abstract
Terahertz
(THz)
communication
is
an
up‐and‐coming
technology
for
the
sixth‐generation
wireless
network.
The
realization
of
ultra‐high‐speed
THz
requires
combination
multi‐dimensional
multiplexing
schemes,
including
polarization
division
(PDM),
mode
(MDM),
and
wavelength
multiplexing,
to
increase
channel
capacity.
However,
most
existing
devices
MDM
in
regime
are
single‐purpose
incapable
modulation.
Here,
all‐dielectric
metasurfaces
designed
2D
multiplexing/demultiplexing,
which
takes
lead
combining
orbital
angular
momentum
(OAM)
PDM
regime.
multi‐functional
wavefront
phase
modulations
interleaved
meta‐atom
arrangements
used
realize
polarization‐selective
multichannel
OAM
(de)multiplexing,
linear‐polarized
4‐channel
circular‐polarized
6‐channel
demultiplexing
experimentally
demonstrated.
Between
different
channels,
measured
maximum
crosstalk
−16.88
dB,
isolation
each
can
be
greater
than
10
dB
a
range
wider
0.1
THz.
This
study
paves
way
regime,
may
benefit
extremely
high‐capacity
integrated
systems.
proposed
design
strategy
readily
applied
microwaves
far
infrared
light,
facilitating
development
OAM‐related
applications.
Chinese Optics Letters,
Год журнала:
2023,
Номер
21(11), С. 113602 - 113602
Опубликована: Янв. 1, 2023
In
this
paper,
we
propose
an
ultrabroadband
chiral
metasurface
(CMS)
composed
of
S-shaped
resonator
structures
situated
between
two
twisted
subwavelength
gratings
and
dielectric
substrate.
This
innovative
structure
enables
high-efficiency
linear
polarization
(LP)
conversion,
as
well
asymmetric
transmission
(AT)
effect
in
the
microwave
region.
The
enhanced
interference
Fabry–Perot-like
resonance
cavity
greatly
expands
bandwidth
efficiency
LP
conversion
AT
effect.
Through
numerical
simulations,
it
has
been
revealed
that
cross-polarization
coefficients
for
normal
forward
(-z)
backward
(+z)
incidence
exceed
0.8
frequency
range
4.13
to
17.34
GHz,
accompanied
by
a
ratio
over
99%.
Furthermore,
our
experimental
results
validate
consistency
among
simulation,
theory,
measurement.
Additionally,
elucidate
distinct
characteristics
significant
through
analysis
azimuth
rotation
ellipticity
angles,
total
transmittance,
coefficient,
electric
field
distribution.
proposed
CMS
shows
excellent
properties
via
potential
applications
areas
such
radar,
remote
sensing,
satellite
communication.
Physica Scripta,
Год журнала:
2024,
Номер
99(3), С. 035519 - 035519
Опубликована: Фев. 2, 2024
Abstract
In
this
paper,
a
chiral
metasurface
is
presented
to
effectively
attain
an
ultra-broadband
operation
of
asymmetric
transmission
with
highly
efficient
cross-polarization
conversion.
The
efficiency
the
in
frequency
band
ranging
from
6.5
13
GHz
above
70%.
Additionally,
range
3.7
14
GHz,
conversion
realizes
greater
than
90%
polarization
ratio.
Asymmetric
as
well
show
angular
stability
against
incident
angle
electromagnetic
waves
up
45°.
To
validate
simulation
results,
fabricated
tested
and
compared
results.
concepts
linear-polarization
are
demonstrated
physically
explained
through
distributions
surface
currents
over
metallic
layers.
This
anticipated
work
has
significant
applications
telecommunications
radar,
potential
use
equipment
designed
for
manipulation
waves.
