Advanced Photonics Nexus,
Год журнала:
2024,
Номер
3(06)
Опубликована: Ноя. 8, 2024
Efficiently
tracking
and
imaging
interested
moving
targets
is
crucial
across
various
applications,
from
autonomous
systems
to
surveillance.
However,
persistent
challenges
remain
in
fields,
including
environmental
intricacies,
limitations
perceptual
technologies,
privacy
considerations.
We
present
a
teacher-student
learning
model,
the
generative
adversarial
network
(GAN)-guided
diffractive
neural
(DNN),
which
performs
visual
of
target.
The
GAN,
as
teacher
empowers
efficient
acquisition
skill
differentiate
specific
target
interest
domains
imaging.
DNN-based
student
model
learns
master
GAN.
process
obtaining
GAN-guided
DNN
starts
with
capturing
objects
effectively
using
an
event
camera
high
temporal
resolution
low
latency.
Then,
power
GAN
utilized
generate
data
position-tracking
capability
for
target,
subsequently
serving
labels
training
DNN.
image
during
while
retaining
target's
positional
information.
Our
experimental
demonstration
highlights
efficacy
expect
can
significantly
enhance
Laser & Photonics Review,
Год журнала:
2024,
Номер
18(10)
Опубликована: Май 17, 2024
Abstract
Arrays
of
multiple
vortex
beams
enhance
parallel
processing
capabilities
from
particle
manipulation
to
information
communication.
However,
the
spatial
position,
topological
charge,
and
energy
parameters
within
array
have
yet
be
precisely
controlled,
posing
significant
challenges
realization
multi‐view
3D
Orbital
Angular
Momentum
(OAM)
display
using
arrays
as
carriers.
To
address
this
issue,
a
method
for
generating
based
on
phase‐only
hologram,
customizing
by
OAM
spectrum
each
beam
loss
function
is
developed.
Experimental
results
indicate
that
2D
generates
100
in
frequency
domain,
while
Fresnel
zone
produces
252
across
7
planes,
with
36
unprecedentedly
controllable
charge
beams.
Subsequently,
images
4
views
decoded
through
coordinate
transformation
achieve
are
encoded.
The
demonstrate
imaging
quality
Mean
Peak
Signal‐to‐Noise
Ratio
(MPSNR)
12.7,
13.0,
13.4,
12.2
dB
views,
respectively,
offering
promising
opportunities
applications
optical
manipulation,
high‐capacity
communication,
holography.
Optics Express,
Год журнала:
2024,
Номер
32(21), С. 36405 - 36405
Опубликована: Сен. 16, 2024
This
study
combines
tensor
polarization
holography
theory
and
multichannel
recording
techniques
proposes
a
novel
encoding
method,
the
orthogonal
polarized
array
(OPA).
method
can
efficiently
independently
reconstruct
holograms
using
accurate
OPA
waves
in
reference-based
multiplexing
technique
when
reference
reading
process
have
same
state
as
those
process.
The
novelty
is
that
dimensions
of
reach
any
number
without
limitations.
Based
on
theoretical
analyses
hologram
superposition
characteristics
material
characteristics,
holographic
memory
with
an
linearly
configuration
was
designed.
experimental
results
were
verified,
demonstrating
independent
reconstruction
three
five
under
different
combinations.
In
addition
to
high-density
optical
data
storage,
this
provides
new
paradigm
for
high-capacity
displays
information
encryption
applications.
Optics Letters,
Год журнала:
2024,
Номер
49(20), С. 5815 - 5815
Опубликована: Сен. 25, 2024
We
propose
a
polarization
superposition
orthogonal
theory
based
on
tensor
holography.
Based
this
theory,
the
holographic
multiplexing
capability
can
be
improved
measurably.
The
orthogonality
of
waves
is
characterized
by
null
reconstruction
in
holography,
achieved
through
multiple
basic
reference
waves.
This
paper
analyzes
linear
wave
and
circular
using
holography
theory.
Using
polarized
technique,
we
experimentally
verify
superposition.
Our
experimental
results
align
with
theoretical
analysis,
indicating
potential
applications
encoding
decoding
thereby
diversifying
optical
encryption
technology
Additionally,
demonstrate
that
holds
significant
promise
for
control
technology.
Optics Letters,
Год журнала:
2024,
Номер
49(19), С. 5495 - 5495
Опубликована: Авг. 13, 2024
In
this
paper,
we
propose
bifocal
lenses
based
on
bilayer
structures
composed
of
a
liquid
crystal
(LC)
cell
and
LC
polymer,
the
relative
intensity
two
foci
can
be
adjusted
arbitrarily
through
applying
an
external
voltage.
Two
layers
have
different
light
modulation
functions:
when
circularly
polarized
passes
first
layer,
part
outgoing
is
converted
with
PB
phase
another
not
converted;
followed
by
second
these
parts
would
simultaneously
realized
but
opposite
signs;
thus
transmitted
left-
right-handed
(LCP
RCP)
independently
controlled.
As
proof-of-concept
examples,
longitudinal
transverse
are
designed
to
split
incident
LCP
into
convergent
beams
orthogonal
helicity,
position
flexibly
arranged.
Benefitting
from
electrically
controlled
polarization
conversion
efficiency
(PCE)
cell,
arbitrarily.
Experimental
results
agree
well
theoretical
calculations.
Besides,
broadband
edge
imaging
system
proposed
also
been
demonstrated.
This
paper
presents
simple
method
design
functional
multilayer
device
may
potentials
in
optical
interconnection,
biological
imaging,
computing.
Laser & Photonics Review,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 18, 2024
Abstract
High‐capacity
steganography
is
crucial
for
the
secure
exchange
of
massive
information.
Exploring
orthogonally
optical
recording
can
significantly
improve
encryption
levels.
However,
due
to
lack
robust
media,
hidden
data
are
easy
be
cracked
or
destructed.
Herein,
carbon
dots
have
switchable
memory
function
between
transmittance
and
polarization
state
after
receiving
excitation
power
adjustment
discovered.
A
large‐area
carbon‐based
disk
further
constructed
which
measured
resist
high‐temperature
damage
at
423
K
more
than
405
h
estimated
remain
stable
room‐temperature
(301
K)
beyond
2341
years.
With
alternated
arrangement
dual
functional
one
region
disk,
only
by
using
an
amplitude‐type
holographic
diffraction
key
polarized
pattern
correctly
read
out.
The
ultra‐high
strategy
also
puts
a
bright
way
applications
3D
image
hiding,
permanent
preservation,
anti‐counterfeiting
labels.
Laser & Photonics Review,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 11, 2024
Abstract
Liquid
crystal
(LC)
planar
optics
have
advanced
wavefront
engineering
toward
ultrathin
designs,
capturing
widespread
attention.
However,
most
control
in
LC
remains
constrained
to
freespace
due
limitations
the
precision
of
freely
controllable
units.
Here,
on‐chip
is
proposed
and
confirmed.
By
controlling
initial
azimuth
angle
polarization
grating,
phase
can
be
engineered,
as
theoretically
predicted
by
rigorous
coupled‐wave
analysis.
Experimentally,
a
volume
hologram
used
waveguide
coupler,
ingeniously
modulated
using
holographic
template.
Consequently,
several
optical
elements,
including
lenses,
vortex
beam
generators,
holograms,
are
demonstrated.
Furthermore,
exit
pupil
expansion
multiexposure
technologies
adopted
enhance
off‐chip
functionality
enable
multifunctional,
highly
integrated
photonic
systems.
The
may
find
applications
freeform
optics,
near‐eye
displays,
LIDAR,
ACS Photonics,
Год журнала:
2024,
Номер
11(11), С. 4778 - 4785
Опубликована: Ноя. 5, 2024
An
all-optical
diffractive
deep
neural
network
(D2NN)
consists
of
deep-learning-based
design
passive
layers
and
uses
light
to
perform
massive
computations
at
the
speed
with
zero
extra
power
consumption,
exhibiting
advantages
large
bandwidth,
high
interconnection,
parallel
processing
capability.
In
this
paper,
we
introduce
a
novel
approach
utilizing
5-layer
D2NN
constructed
photoinduced
liquid
crystal
(LC)
alignment
technology
create
LC-based
tunable
phase
retarders
as
artificial
layers.
The
architecture
leverages
microscale
multidomain
LC
optical
neurons
manipulate
geometric
incident
light.
We
systematically
simulate
pixel-level
displacements
enhance
tolerance
during
experiments,
achieving
robust
resilience
against
misalignment
interference
2-pixel
in
x
y
directions.
By
actively
tuning
external
voltage,
optimize
strategy
for
all
layers,
incorporating
specially
designed
concave
or
convex
lenses
each
retarder
precise
x,
y,
z
Through
training
handwritten
dataset
from
MNIST,
demonstrates
simulated
accuracy
94.17%
2
pixel
tolerance.
Experimental
validation
achieves
classification
89%
500
random
digits
test
dataset.
This
research
showcases
potential
miniaturization,
integration,
compatibility
visible
light,
underscoring
practical
applicability
an
diverse
real-world
applications.
Advanced Photonics Nexus,
Год журнала:
2024,
Номер
3(06)
Опубликована: Ноя. 8, 2024
Efficiently
tracking
and
imaging
interested
moving
targets
is
crucial
across
various
applications,
from
autonomous
systems
to
surveillance.
However,
persistent
challenges
remain
in
fields,
including
environmental
intricacies,
limitations
perceptual
technologies,
privacy
considerations.
We
present
a
teacher-student
learning
model,
the
generative
adversarial
network
(GAN)-guided
diffractive
neural
(DNN),
which
performs
visual
of
target.
The
GAN,
as
teacher
empowers
efficient
acquisition
skill
differentiate
specific
target
interest
domains
imaging.
DNN-based
student
model
learns
master
GAN.
process
obtaining
GAN-guided
DNN
starts
with
capturing
objects
effectively
using
an
event
camera
high
temporal
resolution
low
latency.
Then,
power
GAN
utilized
generate
data
position-tracking
capability
for
target,
subsequently
serving
labels
training
DNN.
image
during
while
retaining
target's
positional
information.
Our
experimental
demonstration
highlights
efficacy
expect
can
significantly
enhance
