2021 7th IEEE International Conference on Network Intelligence and Digital Content (IC-NIDC),
Journal Year:
2023,
Volume and Issue:
unknown, P. 320 - 324
Published: Nov. 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 Lightwave Technology,
Journal Year:
2023,
Volume and Issue:
42(5), P. 1526 - 1537
Published: Sept. 27, 2023
In
this
article,
we
propose
a
metasurface
element
with
simple
structure
and
diverse
functions.
Then,
the
polarization
properties
of
elements
were
looked
at,
simulations
using
finite
method
(FEM)
used
to
get
surface
current
electric
field
distribution,
which
was
confirmed
by
transmission
line
theory
(TLT).
Based
on
Pancharatnam-Berry
(PB)
phase
method,
3-bit
coded
10
gradient
designed.
Therefore,
design
can
produce
maximum
non-diffracting
distance
d
max
=
1055.265
xmlns:xlink="http://www.w3.org/1999/xlink">μm
orbital
angular
momentum
(OAM),
incidence
angle
for
xmlns:xlink="http://www.w3.org/1999/xlink">θi
(
xmlns:xlink="http://www.w3.org/1999/xlink">f
xmlns:xlink="http://www.w3.org/1999/xlink">1
)
27.22°,
xmlns:xlink="http://www.w3.org/1999/xlink">2
31.54°,
xmlns:xlink="http://www.w3.org/1999/xlink">3
24.25°,
corresponding
frequency
respectively
2.62
THz,
2.29
2.93
along
−
xmlns:xlink="http://www.w3.org/1999/xlink">x
,
xmlns:xlink="http://www.w3.org/1999/xlink">y
direction
incidence,
+
xmlns:xlink="http://www.w3.org/1999/xlink">z
axis
coaxial
topological
charge
xmlns:xlink="http://www.w3.org/1999/xlink">l
4,
−1,
2
mode
xmlns:xlink="http://www.w3.org/1999/xlink">4
−2
OAM
vortex
beam,
implements
3
×
4
12
orthogonal
mode,
frequency,
multiplexing
metasurface,
realises
multidimensional
reuse,
channel
is
uncapped
in
theory.
The
aforementioned
observation
closely
tied
fundamental
property
that
modes
exhibit
orthogonality
one
another.
Furthermore,
study
also
examines
methodology
concept
simulated
annealing
algorithm
(SA)
relation
optimizing
application
radar
cross
section
(RCS)
reduction.
Journal of Materiomics,
Journal Year:
2023,
Volume and Issue:
10(4), P. 811 - 818
Published: Oct. 21, 2023
Vortex
light
is
a
unique
beam
characterized
by
spiral
phase
as
it
propagates.
A
fundamental
parameter
of
vortex
the
topological
charge,
which
determines
amount
angular
momentum
and
plays
crucial
role
in
tailoring
its
behavior.
However,
conventional
measurement
methods
for
determining
such
those
based
on
interference
modulation,
tend
to
be
intricate
complex.
In
this
regard,
labeled
generator
proposed,
composed
metasurface
with
single-celled
configuration.
When
illuminated
designed
wavelength,
outgoing
exhibits
structure.
Furthermore,
charge
numbers
can
directly
observed
distinct
patterns
when
placed
an
orthogonal-polarized
optical
path.
With
advantages
ultra-compactness,
high
robustness,
exceptional
precision,
proposed
significant
potential
applications
communication,
manipulation,
sensing,
etc.
Nanophotonics,
Journal Year:
2023,
Volume and Issue:
12(22), P. 4239 - 4254
Published: Oct. 26, 2023
Optical
vortices
(OVs)
have
rapidly
varying
spatial
phase
and
optical
energy
that
circulates
around
points
or
lines
of
zero
intensity.
Manipulation
OVs
offers
innovative
approaches
for
various
fields,
such
as
sensing,
communication,
imaging.
In
this
work,
we
demonstrate
the
correlation
between
absorption
enhancement
in
two
types
structures.
First,
introduce
a
simple
planar
one-dimensional
(1D)
structure
manipulates
using
coherent
light
sources.
The
shows
maximum
6.05-fold
gap
depending
on
presence
OVs.
Even
slight
difference
incidence
angle
can
influence
generation/annihilation
OVs,
which
implies
high
sensitivity
angular
detection.
Second,
apply
inverse
design
to
optimize
two-dimensional
(2D)
perfect
ultrathin
absorbers.
optimized
free-form
achieves
99.90
%
absorptance,
fabricable
grating
97.85
at
775
nm
wavelength.
To
evaluate
OV
fields
their
contribution
achieving
enhancement,
new
parameter,
circularity.
structures
generate
numerous
with
circularity
95.37
(free-form)
96.14
(grating),
superior
our
1D
structure.
Our
study
reveals
role
high-circularity
localized
optimizing
nano-structured
absorbers
devices
many
other
applications.
Journal of the Optical Society of America B,
Journal Year:
2023,
Volume and Issue:
40(11), P. 2979 - 2979
Published: Oct. 11, 2023
This
paper
presents
an
analytical
procedure
for
designing
orbital
angular
momentum
(OAM)
multiplexers
with
the
capability
of
generating
multiple
multiplexed
beams
different
directions
and
OAM
mode
indices.
The
presented
design
method
provides
independent
control
power
each
output
in
a
beam.
As
proof
concept,
metasurface
four
incident
two
scattered
modes
is
designed.
It
based
on
2/2
bits
phase–amplitude
programmable
which
numerically
simulated,
results
are
good
agreement
predictions.
approach
paves
way
implementation
multifunctional
devices
specially
used
communication
systems.
Acta Physica Sinica,
Journal Year:
2023,
Volume and Issue:
72(15), P. 158701 - 158701
Published: Jan. 1, 2023
In
this
paper,
we
propose
a
dual-polarization
ultra-wideband
metasurface
with
half-reflection
and
half-transmission
based
on
double-split-ring
(DSR)
structure
operating
in
terahertz
(THz)
frequency
range.
The
designed
can
simultaneously
control
the
circularly
polarized
(CP)
wave
linearly
(LP)
reflection
mode
transmission
mode,
covering
an
extensive
THz
unit-cell
architecture
of
consists
periodic
arrangement
DSR
made
metal,
which
is
affixed
to
ultra-thin
dielectric
substrate.
By
manipulating
size
rotation
direction
structure,
achieve
full
phase
coverage
0–2π
orthogonally
LP
CP
across
span
0.3–1.2
THz,
encompassing
scenarios.
relative
bandwidths
corresponding
orthogonal
average
amplitude
0.45
reach
86%
120%,
respectively.
Specifically,
through
numerical
simulations,
demonstrate
that
has
ability
beam
deflection
vortex
generation
while
reflecting
transmitting
wave.
proposed
holds
great
promise
for
various
applications
These
findings
pave
way
development
flexible
versatile
devices
expanded
functionality,
thereby
opening
up
new
possibilities
wavefront
manipulation
metasurfaces.
Optical Materials Express,
Journal Year:
2023,
Volume and Issue:
13(11), P. 3187 - 3187
Published: Sept. 21, 2023
The
divergence
of
orbital
angular
momentum
(OAM)
plays
a
crucial
role
in
practical
terahertz
OAM
applications.
However,
most
the
existing
research
focuses
on
half-space
configurations,
which
significantly
limit
utilization
space
and
are
not
aligned
with
future
development
wireless
communication.
In
this
paper,
we
present
modeling
design
two
broadband
high-efficiency
janus
transmit-reflect
metasurfaces
(JTRMS).
These
enable
generation
quasi-non-diffracting
beams
carrying
forward
transmission
(FTS),
reflection
(FRS),
backward
(BTS).
key
difference
lies
polarization
characteristics:
TRMS1
produces
left-handed
circularly
polarized
(LHCP)
beam
both
FTS
FRS,
while
generating
right-handed
(RHCP)
BTS.
On
other
hand,
TRMS2
generates
LHCP
BTS,
producing
RHCP
FRS.
This
allows
for
flexible
control
outgoing
waves
different
spaces.
proposed
strategy
high-performance
hold
promising
application
prospects
communication
systems
that
require
large
capacity
support
multi-directional
scenarios.
Journal of Physics D Applied Physics,
Journal Year:
2024,
Volume and Issue:
57(24), P. 245101 - 245101
Published: March 7, 2024
Abstract
A
3D
transmitarray
(TA)
is
proposed
to
generate
dual-polarized
orbital
angular
momentum
(OAM)
beams
with
gain
and
mode
purity
filtering
responses.
The
TA
units
are
realized
by
square
cavity
filters
the
same
passband
different
orders
inner
widths,
resulting
in
coupling
numbers.
evanescent
modes
cavities
will
greatly
decrease
propagation
constant,
thus
generating
a
large
phase
variation.
structure
of
filter
makes
it
able
support
wave
delay
insert
loss.
Based
on
these
transmission
characteristics,
eight
designed
realize
3-bit
gradient
within
25.4–26.7
GHz.
It
should
be
emphasized
that
dispersed
magnitude
stopbands
deteriorate
OAM
beam.
Therefore,
responses
can
simultaneously.
In
order
verify
performance
design,
prototype
number
l
=
−1
fabricated
printing
technology.
maximum
25.9
dB
passband,
rejection
level
below
−15.0
main
beam
direction.
purities
over
0.5
cross-polarization
−16.5
dB.
advantages
TA,
including
gain-filtering
purity-filtering
responses,
dual-polarization,
high
efficiency
make
promising
solution
for
millimeter-wave
sensing
communication
applications.
