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 3, 2024
Abstract
Optical
encryption
is
an
increasingly
significant
technique
in
the
realm
of
information
security.
In
recent
decade,
there
has
been
considerable
interest
using
planar
optics
elements
for
encryption.
However,
leakage
possibly
occurs
due
to
limited
encrytion
channels
available
single‐layer
devices.
To
circumvent
this
problem,
a
novel
method
put
forward
secret
sharing
cascaded
liquid
crystal
(LC)
with
spatial
dislocation,
which
can
produce
near‐field
patterns
and
far‐field
holographic
images
under
different
illumination
conditions.
Specifically,
Malus's
Law
its
inherent
one‐to‐four
mapping
rotational
degeneracy,
along
Pancharatnam‐Berry
(PB)
phase
introduced
by
LC
molecules,
achieve
multi‐channel
are
utilized.
Therefore,
each
unit
manipulate
amplitude
imparted
output
light
independently,
thus
only
obtaining
both
devices
decryption
be
realized.
further
enhance
security,
author
purposely
divide
device
into
multiple
regions
find
that
encrypted
recovered
when
two
align
precisely
specific
dislocation.
These
experimental
measurements
agree
well
design,
demonstrating
strong
capability
broad
application
prospects
design
approach
field
optical
high
cost‐effectiveness.
We
introduce
an
information-hiding
camera
integrated
with
electronic
decoder
that
is
jointly
optimized
through
deep
learning.
This
system
uses
a
diffractive
optical
processor,
which
transforms
and
hides
input
images
into
ordinary-looking
patterns
deceive/mislead
observers.
transformation
valid
for
infinitely
many
combinations
of
secret
messages,
transformed
output
passive
light-matter
interactions
within
the
processor.
By
processing
these
patterns,
network
accurately
reconstructs
original
information
hidden
deceptive
output.
demonstrated
our
approach
by
designing
cameras
operating
under
various
lighting
conditions
noise
levels,
showing
their
robustness.
further
extended
this
framework
to
multispectral
operation,
allowing
concealment
decoding
multiple
at
different
wavelengths,
performed
simultaneously.
The
feasibility
was
also
validated
experimentally
using
terahertz
radiation.
encoder–electronic
decoder-based
codesign
provides
high
speed
energy
efficient
camera,
offering
powerful
solution
visual
security.
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 19, 2025
Abstract
Increasing
the
number
of
optical
information
encryption
(OIE)
layers
can
exponentially
enhance
its
security,
which
requires
introducing
additional
degrees
freedom
(DoFs)
for
light.
However,
traditional
OIE
systems
encounter
challenges
due
to
exponential
increases
in
volume
and
mass
with
expansion
modulation
DoFs,
thereby
retarding
development
integrated
high‐security
OIE.
Here,
a
high‐dimensional
dual‐layer
(DLOIE)
strategy
is
proposed
experimentally
established
by
utilizing
novel
metasurface‐generated
beam,
termed
spin‐multiplexed
grafted
perfect
vector
vortex
beam
(MGPVVB).
MGPVVB
generated
superposing
beams
programmable
combinations
topological
charges
(CTCs)
across
two
orthogonally
circularly
polarized
states.
As
key
factor
DLOIE,
introduces
new
DoF
called
CTCs
be
customized
within
same
polarization
order
(PO).
The
metasurface
well‐suited
generating
MGPVVBs
over
wide
bandwidth
(450–1064
nm).
all
states
on
Poincaré
sphere
are
generated.
More
importantly,
DLOIE
achieved
through
an
array.
For
(true
false)
encoding
based
PO
ellipticity,
while
verification
authenticity
governed
distinctive
CTCs.
This
advancement
enhances
security
OIE,
shows
great
value
applications
storage,
communications,
quantum
processing.
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 24, 2025
Abstract
Orbital
angular
momentum
(OAM)
holography
represents
a
transformative
technique
for
enhancing
the
information
channel
capacity
of
holographic
systems
through
convolution
theoretical
infinite
OAM
states
with
discrete
sampling
target
images.
However,
inherent
axial
chromatic
aberration
(ACA)
in
Fourier
lens
functions
leads
to
misalignment
planes
OAM‐dependent
holograms
across
different
wavelengths,
thereby
limiting
3D
multicolor
holography.
To
address
this
challenge,
novel
approach
achieving
achromatic
multi‐color
using
spatial
multiplexing
scheme
is
presented.
Specifically,
an
optically
digitalized
hologram
developed
by
superposing
wavelength‐specific
onto
monochromatic
holograms,
followed
high‐resolution
discretization
and
interleaving
via
two‐photon
lithography
(TPL).
Experimental
results
demonstrate
that
method
enables
double‐plane
(along
propagation
direction
light),
3‐color
(633,
532,
460
nm),
3‐channel
OAM‐multiplexing
display
(OAM
order
l
en
=
1,4,
7)
ACA
correction,
utilizing
nano‐printed
featuring
subwavelength
(600
nm)
pixel
size.
This
breakthrough
paves
way
high‐capacity,
multi‐spectral
data
storage
retrieval,
significant
implications
augmented
reality
(AR)/virtual
(VR)
display,
optical
encryption,
artificial
intelligence.
Nano Letters,
Год журнала:
2024,
Номер
24(28), С. 8679 - 8686
Опубликована: Июль 1, 2024
The
simultaneous
detection
of
the
orbital
angular
momentum
(OAM)
and
wavelength
offers
new
opportunities
for
optical
multiplexing.
However,
because
dispersion
lens
functions
Fourier
transformation,
mode
conversions
at
distinct
wavelengths
cannot
be
achieved
in
same
plane.
Here
we
propose
an
ultracompact
achromatic
complementary
metal
oxide
semiconductor
(CMOS)-integrated
OAM
detector.
Specifically,
a
spatial
multiplexed
scheme,
randomly
interleaving
phase
distributions
distributing
superposed
modes
into
preset
positions
wavelengths,
is
presented.
In
addition,
such
nanoprinted
detector
featuring
microscale
size
short
focal
length
can
integrated
onto
CMOS
chip.
Consequently,
four-bit
incident
light
beams
three
discrete
(633,
532,
488
nm)
distinguished
with
high
degree
accuracy
evaluated
by
average
standardized
Euclidean
distance
∼0.75
between
analytical
target
results.
Our
results
showcase
miniaturized
platform
achieving
high-capacity
information
processing.
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 16, 2025
Abstract
As
information
security
becomes
an
increasingly
challenging
and
highly
prioritized
issue,
optical
holographic
encryption
has
recently
attracted
significant
attention.
In
particular,
vector
holography
exploits
the
properties
of
light
to
overcome
limitations
traditional
scalar
holography,
enhancing
dimensionality
improving
security.
However,
current
methods
focus
solely
on
design
metasurfaces
or
liquid
crystal
(LC)
devices,
without
fully
considering
interaction
between
incidence
device,
thereby
limiting
available
channels.
Vector
field,
which
arbitrarily
designed
wavefronts
polarization
state
distributions,
provides
greater
degrees
control
than
uniform
field.
this
work,
integrates
with
field
propose
secure
by
directly
encoding
into
a
reprogrammable
incidence.
This
method
involves
dividing
distributing
secret
among
various
carriers,
namely
LC
analyzer.
By
orientation
analyzer's
transmission
axis,
multi‐channel
is
achieved
utilizing
static
device.
The
proposal
promising
pathway
for
advancing
encryption,
strengthening
authentication
capabilities,
overall
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 26, 2025
Abstract
Soft
matter,
featuring
superior
flexibility
and
intriguing
tunability,
has
shown
enormous
potential
in
sensors,
soft
robots,
light
tailoring.
However,
limited
by
its
inherent
structural
complexity,
matter
remains
uncompetitive
multidimensional
high‐density
information
optics.
Herein,
a
heterogeneous
liquid‐crystal
(LC)
superstructure
composed
of
interlocked
nematic
chiral
LCs
is
designed
to
achieve
higher‐dimensional
control.
Optically
photopatterning
with
programmable
UV
polarization
dosage
proposed
precisely
customize
both
transverse
longitudinal
LC
arrangements,
bringing
wide
range
light‐matter
interactions
within
single
micrometer‐thick
film.
The
constructed
not
only
enables
simultaneous
near‐field
full‐color
printing
far‐field
holography
but
also
boasts
brightness
controllability
selectivity.
This
low‐cost
photonic
structure
high
density
≈1.6
million
hybrid‐dimensional
optical
data
per
square
millimeter,
unlocking
new
capabilities
storage,
display,
encryption.
work
creates
an
ingenious
bond
between
advanced
technologies
higher‐level
informatics,
pioneers
soft‐matter‐mediated
full‐dimensional
