Optics Express,
Journal Year:
2023,
Volume and Issue:
31(19), P. 30615 - 30615
Published: Aug. 23, 2023
Scintillation
is
an
important
problem
for
laser
beams
in
free
space
optical
(FSO)
communications.
We
derived
the
analytical
expressions
scintillation
index
of
a
Gaussian
Schell-model
beam
with
cross
phase
propagation
turbulent
atmosphere.
The
numerical
results
show
that
quadratic
can
be
used
to
mitigate
turbulence-induced
scintillation,
and
effects
strength
parameters
at
source
plane
on
are
analyzed.
variation
trend
experimentally
measured
consistent
results.
Our
expected
useful
FSO
PhotoniX,
Journal Year:
2024,
Volume and Issue:
5(1)
Published: Nov. 4, 2024
Abstract
Pulsed
polarized
vortex
beams,
a
special
form
of
structured
light,
are
generated
by
tailoring
the
light
beam
spatiotemporally
and
witness
growing
application
demands
in
nonlinear
optics
such
as
ultrafast
laser
processing
surface
plasma
excitation.
However,
existing
techniques
for
generating
beams
suffer
from
either
low
compactness
due
to
use
bulky
components
or
limited
controlment
pulse
performance.
Here,
an
all-fiber
technique
combining
plasmonic
metafibers
with
mode
conversion
method
is
harnessed
generate
high-performance
pulsed
beams.
Plasmonic
utilized
saturable
absorbers
produce
Q-switched
pulses
micro-second
duration,
while
offset
splicing
employed
partially
convert
fundamental
transverse
(LP
$$_{01}$$
01
)
higher-order
$$_{11}$$
11
).
Eventually,
achieved
at
telecom
band
repetition
frequency
116.0
kHz.
The
impact
geometrical
parameters
including
period
on
spatiotemporal
properties
systematically
investigated.
Our
findings
could
pave
way
design,
control
generation
also
offer
insights
into
development
other
types
sources.
Photonics,
Journal Year:
2024,
Volume and Issue:
11(1), P. 69 - 69
Published: Jan. 8, 2024
In
the
background
of
6G
communication
requiring
a
high
data
rate
and
energy
efficiency,
global
coverage
connectivity,
as
well
reliability
low
latency,
most
existing
reconfigurable
metasurfaces
face
limitations
in
flexibility,
integrability,
consumption,
cost.
This
paper
proposes
dual-polarized
intelligent
reflection
surface
(IRS)
based
on
paper-based
flexible
substrate
solution.
The
proposed
design
uniquely
enables
independent
control
two
orthogonally
polarized
electromagnetic
waves
to
achieve
customized
scattering
effects.
Compared
conventional
surfaces
using
PCB
technology
active
components,
this
utilizes
material
combined
with
conductive
ink
silver
ink,
significantly
reducing
production
costs
process
complexity.
manufacturing
cost
is
only
about
one-tenth
traditional
solutions.
approach
not
cost-effective
but
also
excels
both
flexibility
portability.
These
attributes
signify
its
suitability
for
broader
range
potential
applications,
encompassing
areas
where
RIS
may
be
impractical
due
cost,
rigidity,
or
complexity
constraints.
By
drawing
rotationally
symmetric
small
metal
block
structures
four
are
designed
that
phase
difference
90
degrees
x-polarized
y-polarized
wave
incidences
at
resonant
frequency
4.5754
GHz,
realizing
modulation.
2-bit
consists
20×20
unit
cells,
six
different
coding
patterns
single-beam
dual-beam
angles.
experimental
results
show
polarization-independent
structure
successfully
allows
waves,
enabling
highly
consistent
simulation
results.
orthogonal
key
feature
our
design,
more
effective
signal
complex
urban
environments.
precise
over
polarization
enhances
adaptability
system
offers
practical
solutions
real-world
particularly
meeting
growing
demands
communication.
metasurface
low-cost
portable,
independence
provides
freedom
metasurface,
which
beneficial
efficient
beam
can
applied
field
communication,
especially
IRS
wireless
addition,
it
has
broad
application
prospects
radar
systems
remote
sensing
applications.
Microwave and Optical Technology Letters,
Journal Year:
2024,
Volume and Issue:
66(1)
Published: Jan. 1, 2024
Abstract
To
solve
the
problem
of
target
recognition
for
flying‐birds
and
biomimetic
flapping‐wing
unmanned
aerial
vehicles
(UAVs),
a
rectangular‐trapezoidal
composite
scattering
model
lidar
detection
bird
wings
has
been
proposed
established.
According
to
model,
influence
different
line‐of‐sight
angles
on
time–frequency
distribution
characteristics
laser
micro‐Doppler
under
same
flapping
wing
motion
was
simulated
studied.
Then,
frequency
maximum
shift
are
extracted
based
two‐dimensional
Fourier
transform
least
squares
method.
When
signal
noise
ratio
=
5
dB,
accuracy
rate
extraction
can
reach
at
100%,
relative
error
inner
contour
is
less
than
3.0%,
outer
7.2%.
Microwave and Optical Technology Letters,
Journal Year:
2024,
Volume and Issue:
66(2)
Published: Jan. 30, 2024
Abstract
Photoacoustic
spectroscopy
(PAS),
with
the
advantages
of
high
sensitivity,
extensive
dynamic
range,
selectivity,
and
nondestructive,
has
become
one
research
hotspots
in
multigas
detection.
This
review
aims
to
discuss
latest
advancements
PAS
for
multicomponent
gas
The
key
elements
technique
available
support
detection,
namely
as
optical
source,
recent
developments
detection
methods
are
presented.
different
source‐based
experimental
systems
such
broadband
light
sources
various
lasers
reported,
related
modulation
performances
analyzed.
Finally,
terms
characteristics
miniaturization,
we
limitations
these
trace
techniques
towards
practical
application.
Abstract
In
recent
years,
the
emergence
of
metasurfaces
has
brought
revolutionary
changes
to
generation
and
processing
vortex
beams,
triggering
widespread
research
interest.
Meanwhile,
longitudinally
varying
features
propagating
beams
provide
new
design
freedom
for
realizing
multi‐dimensional
optical
manipulation
promote
advancements
related
areas
such
as
microscopic
detection,
microfabrication,
biomedical
applications.
addition,
self‐accelerating
Bessel
are
promising
a
wide
range
applications
particle
medicine
due
their
nondiffracting,
self‐healing
well
obstacle
avoidance
properties.
this
paper,
novel
kind
curved
transmitted
high‐order
with
based
on
form‐birefringent
metasurface,
by
simultaneously
manipulating
phase
profiles
output
orthogonal
polarization
components
is
demonstrated.
Multiple
dimensions
beam,
including
propagation
trajectory,
state,
orbital
angular
momentum,
can
be
tailored
arbitrarily.
For
verifying
feasibility
demonstrated
method,
two
samples
different
trajectories,
variations
designed
experimentally
Such
approach
open
doors
used
depth
sensing
distance
measurement
in
complex
environments.
Journal of Lightwave Technology,
Journal Year:
2024,
Volume and Issue:
42(10), P. 3677 - 3683
Published: Feb. 15, 2024
Vortex
beams
carrying
orbital
angular
momentum
(OAM)
modes
hold
the
promise
of
facilitating
high-dimensional
symbol
mappings
for
information
encryption.
However,
challenges
persist
in
achieving
both
high-security
and
high-capacity
encryption
with
OAM
modes,
mainly
due
to
limitations
encoding
degrees
freedom
compatible
decoding
methods.
Herein,
we
present
an
scheme
that
integrates
truncated
phase
encoding.
Truncated
are
hybrid
emerges
from
mode
dispersion
caused
by
absence
amplitude
modulation
during
generation.
By
combining
generation
function
encoding,
can
modulate
dispersion,
creating
a
discrete
set
modes.
This
introduces
degree
onto
spectrum,
The
exponential
expansion
factors
enables
construction
higher-order
maps,
thereby
increasing
capacity.
As
proof-of-concept,
implemented
optical
encrypting
link
using
4
32-order
resulting
over
3×104
orders.
neural
network
successfully
decoded
100%
accuracy.
offers
potential
incorporate
additional
generating
further
partition
enabling
even
higher-dimensional
mapping.
These
advancements
open
up
new
possibilities
advancing
based
on
APL Photonics,
Journal Year:
2025,
Volume and Issue:
10(2)
Published: Feb. 1, 2025
Vortex
beams
carrying
orbital
angular
momentum
(OAM)
provide
an
infinite
degree-of-freedom
and
hold
high
potential
in
various
applications,
from
high-capacity
optical
communication
to
diagnosis
of
materials
with
chirality.
Quantitative
spatial
spectrum
analysis
OAM
modes
is
essential
for
these
yet
it
still
a
challenge
obtain
the
under
short-wavelength
systems
such
as
extreme
ultraviolet
(EUV)
x-ray.
Here,
we
introduce
simple
single-shot
diffractive
method
that
can
reconstruct
arbitrary
helical
wavefront
quantitatively
decompose
individual
modes.
There
no
need
conduct
any
calibration
associated
beam
be
measured;
only
prior
knowledge
required
transmission
function
random
diffusing
modulator.
Experimental
results
show
this
retrieve
intermodal
crosstalk
lower
than
−16.91
dB
topological
charge
greater
50.
The
proof-of-concept
visible
light
experiments
multiplexing
demultiplexing
showed
its
applications
laser
metrology.
Given
simplicity
lens-less
system
setup,
capability,
suitability
modes,
envision
setting
up
brand-new
solution
structured
over
broad
spectral
range,
EUV,
x-ray,
even
electron
beam.
Dynamically
encircling
an
exceptional
point
(EP)
in
non-Hermitian
systems
can
exploit
the
intriguing
energy
topology
around
EP,
giving
rise
to
unique
applications
such
as
chiral
mode
switching.
In
this
work,
we
introduce
concept
of
EP
encirclement
time-reversal-symmetry
broken
topological
towards
manipulation
topologically
protected
one-way
edge
modes.
We
design
a
three-layered
gyromagnetic
photonic
crystal,
which,
under
specially
distributed
external
magnetic
fields,
possesses
two
The
proposed
system
is
found
be
equivalent
two-level
with
at
frequency
interest.
two-dimensional
parameter
space
dynamically
encircle
where
direction
switched
by
designs,
while
tuned
changing
fields.
A
selective
transport
modes
realized,
that
is,
output
solely
depends
on
direction,
field.
behavior
performance
robust
local
defects
and
backward
scatterings
are
avoided.
Our
findings
provide
means
for
manipulating
electromagnetic
waves
systems.
