Optics Letters,
Journal Year:
2024,
Volume and Issue:
49(8), P. 2061 - 2061
Published: March 12, 2024
Controlling
the
properties
of
mid-
and
far-infrared
radiation
can
provide
a
means
to
transiently
alter
materials
for
novel
applications.
However,
limited
number
optical
elements
are
available
control
its
polarization
state.
Here
we
show
that
15-µm
thick
liquid
crystal
cell
containing
8CB
(4-octyl-4'-cyanobiphenyl)
in
ordered,
smectic
A
phase
be
used
as
retarder
or
wave
plate.
This
was
tested
using
bright,
short-pulsed
(∼1
ps)
centered
at
16.5
µm
(18.15
THz)
is
emitted
by
free
electron
laser
high
repetition
rate
(13
MHz).
These
results
demonstrate
possible
tool
exploration
range
could
develop
metamaterials
extend
multidimensional
spectroscopy
this
portion
electromagnetic
spectrum.
Opto-Electronic Advances,
Journal Year:
2024,
Volume and Issue:
7(2), P. 230184 - 230184
Published: Jan. 1, 2024
An
electron
vortex
beam
(EVB)
carrying
orbital
angular
momentum
(OAM)
plays
a
key
role
in
series
of
fundamental
scientific
researches,
such
as
chiral
energy-loss
spectroscopy
and
magnetic
dichroism
spectroscopy.
So
far,
almost
all
the
experimentally
created
EVBs
manifest
isotropic
doughnut
intensity
patterns.
Here,
based
on
correlation
between
local
divergence
angle
phase
gradient
along
azimuthal
direction,
we
show
that
free
electrons
can
be
tailored
to
with
customizable
patterns
independent
carried
OAM.
As
proof-of-concept,
by
using
computer
generated
hologram
designing
masks
shape
incident
transmission
microscope,
three
structured
identical
OAM
are
exhibit
completely
different
Furthermore,
through
modal
decomposition,
quantitatively
investigate
their
spectral
distributions
reveal
present
superposition
eigenstates
induced
locally
varied
geometries.
These
results
not
only
generalize
concept
EVB,
but
also
demonstrate
an
extra
highly
controllable
degree
freedom
for
manipulation
addition
Photonics,
Journal Year:
2025,
Volume and Issue:
12(4), P. 306 - 306
Published: March 27, 2025
This
article
focuses
on
the
application
of
digital
engineering
in
diffractive
optics
for
precision
laser
material
processing.
It
examines
methods
development
optical
elements
(DOEs)
and
adaptive
management
approaches
that
enhance
accuracy
efficiency
Key
achievements
are
highlighted
numerical
modeling,
machine
learning
applications,
geometry
optimization
systems,
along
with
integration
dynamic
DOEs
systems
beam
control.
The
discussion
includes
complex
structures
improved
characteristics
new
approaches.
Special
attention
is
given
to
micro-
nanostructuring,
additive
manufacturing
technologies,
their
into
high-performance
systems.
Additionally,
challenges
related
thermal
stability
materials
complexity
DOE
control
explored,
as
well
role
artificial
intelligence
enhancing
processing
efficiency.
Applied Physics Letters,
Journal Year:
2024,
Volume and Issue:
125(7)
Published: Aug. 12, 2024
High-order
vortex
beams
carrying
orbital
angular
momentum
in
the
visible
wavelength
range
are
of
tremendous
interest
for
a
diversity
applications,
including
super-resolution
imaging,
microfabrication,
and
underwater
communications.
Such
can
be
generated
directly
from
compact
solid-state
lasers;
however,
they
generally
have
low
topological
charge
number.
In
this
work,
we
demonstrate
generation
high-order
Laguerre–Gaussian
(LG)
modes
simple
Pr:YLF
laser
cavity
its
application
measurement
velocity.
We
utilize
enhanced
intracavity
spherical
aberration
to
generate
LG0,±m
with
m
selectable
up
34,
operating
at
640
nm.
beam
an
off-axis
illumination
geometry
conjunction
rotational
Doppler
effect,
measure
velocity
spinning
object.
The
demonstration
highlights
potential
these
types
laser.
Abstract
Generating
structured
electromagnetic
(EM)
beams
in
pre‐designed
manners
is
highly
desired
photonics
applications,
but
conventional
devices
suffer
from
the
issues
of
bulky
sizes
and
restricted
functionalities.
Although
metasurfaces
have
exhibited
powerful
capabilities
controlling
EM
waves,
they
usually
work
under
propagating‐wave
(PW)
excitations,
being
unfavorable
for
integration.
Here,
a
generic
scheme
proposed
to
design
that
can
efficiently
generate
far‐field
(FF)
vectorial
with
longitudinally
varying
polarizations
surface‐wave
(SW)
excitations.
Such
consist
two
sub‐sets
Pancharatnam‐Berry
(PB)
meta‐atoms
specifically
designed
orientation
angles,
each
sub‐set
circularly
polarized
FF
beam
particular
spin
their
interference
forms
target
beam.
After
experimentally
demonstrating
benchmark
metadevices
generating
homogeneously
distributed
polarizations,
microwave
metasurface
fabricated
demonstrate
it
Bessel
polarization
SW
excitation.
These
findings
significantly
expand
paving
way
realize
many
applications
on‐chip
photonics,
such
as
chip‐integrated
displays,
encrypted
holography,
augmented
reality
technology.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(31)
Published: May 25, 2024
The
precise
construction
of
hierarchically
long-range
ordered
structures
using
molecules
as
fundamental
building
blocks
can
fully
harness
their
anisotropy
and
potential.
However,
the
3D,
high-precision,
single-step
directional
assembly
is
a
long-pending
challenge.
Here,
3D
molecular
strategy
via
femtosecond
laser
direct
writing
(FsLDW)
proposed
feasibility
this
approach
liquid
crystal
(LC)
an
illustrative
example
demonstrated.
physical
mechanism
for
(fs)
laser-induced
LC
investigated,
arbitrary
achieved
by
defining
discretized
scanning
pathway.
Additionally,
LC-based
Fresnel
zone
plate
array
with
polarization
selection
colorization
imaging
functions
fabricated
to
further
illustrate
potential
method.
This
study
not
only
introduces
high-resolution
alignment
method
functional
devices
but
also
establishes
universal
protocol
anisotropic
molecules.
Abstract
High‐efficiency
spatial
light
phase
modulation
with
wide
operating
bandwidth
is
highly
significant
yet
challenging.
Dynamic
metasurfaces
leveraging
active
materials
tunable
optical
response
provide
a
promising
solution.
Current
work
generally
confronted
restricted
operation
and
diminished
efficiency,
constrained
by
the
limited
range
inherent
absorption
of
particular
at
frequency.
Recently,
emergence
lossless
phase‐change
material
Sb
2
Se
3
has
garnered
widespread
attention.
Its
unique
characteristics,
including
near‐zero
near‐infrared
substantial
refractive
index
contrast
≈0.93
during
transition,
enable
possibility
high‐performance
modulation.
Pioneering
studies
have
validated
capability
for
wavefront
control,
but
are
typically
to
efficiency.
Here,
hybrid
metasurface
utilizing
over‐coupled
resonances
supported
nanoholes
proposed.
For
first
time
in
frequency,
high‐efficiency
4‐level
covering
over
π
experimentally
demonstrated
sizable
42
nm
minimum
reflectance
exceeding
0.5.
Leveraging
optically
driven
localized
phase‐transition
technique,
dynamic
beam
deflection
further
demonstrated.
The
validates
tremendous
potential
achieving
advanced
signifying
progress
development
application
photonic
devices.
Journal of Applied Physics,
Journal Year:
2024,
Volume and Issue:
136(3)
Published: July 16, 2024
Machine
learning
with
artificial
neural
networks
has
recently
transformed
many
scientific
fields
by
introducing
new
data
analysis
and
information
processing
techniques.
Despite
these
advancements,
efficient
implementation
of
machine
on
conventional
computers
remains
challenging
due
to
speed
power
constraints.
Optical
computing
schemes
have
quickly
emerged
as
the
leading
candidate
for
replacing
their
electronic
counterparts
backbone
networks.
Some
early
integrated
photonic
network
(IPNN)
techniques
already
been
fast-tracked
industrial
technologies.
This
review
article
focuses
next
generation
optical
(ONNs),
which
can
perform
algorithms
directly
in
free
space.
We
aptly
named
this
class
model
space
(FSONN).
systematically
compare
FSONNs,
IPNNs,
traditional
models
regard
fundamental
principles,
forward
propagation
model,
training
process.
survey
several
broad
classes
FSONNs
categorize
them
based
technology
used
hidden
layers.
These
technologies
include
3D
printed
layers,
dielectric
plasmonic
metasurface
spatial
light
modulators.
Finally,
we
summarize
current
state
FSONN
research
provide
a
roadmap
its
future
development.
Applied Optics,
Journal Year:
2024,
Volume and Issue:
63(14), P. 3779 - 3779
Published: April 16, 2024
We
present
an
approach
for
the
realization
of
controlled
spiral-shaped
mass
transfer
in
azopolymer
thin
films
and
fabrication
spiral
microreliefs.
For
such
laser
processing,
we
propose
to
use
light
fields
with
structured
polarization
distributions
generated
by
a
transmissive
spatial
modulator.
The
projection
lithography
is
utilized,
transferring
pattern
directly
surface
films.
shaped
different
dependencies
vector
orientation
on
azimuthal
angle
allow
us
drive
waves
sample
along
trajectory.
Additionally,
ability
control
concavity
formed
microreliefs
demonstrated.
This
can
be
effectively
modified
direct
more
complex
nano-/micro-elements
as
well
their
arrays.
