Coatings,
Journal Year:
2025,
Volume and Issue:
15(5), P. 512 - 512
Published: April 24, 2025
This
paper
presents
a
highly
sensitive
and
tunable
graphene-based
metamaterial
perfect
absorber
(MPA)
operating
in
the
near-terahertz
band.
The
structure
features
unique
flower-like
graphene
pattern,
consisting
of
Au
substrate,
SiO2
dielectric
layer,
patterned
graphene.
Multiple
reflections
incident
light
between
gold
layers
increase
duration
intensity
interaction,
resulting
efficient
absorption
at
specific
frequencies.
design
utilizes
surface
plasmon
resonance
(SPR)
to
achieve
near-perfect
99.9947%
99.6079%
11.7475
THz
15.8196
THz,
respectively.
By
tuning
Fermi
level
relaxation
time
graphene,
it
is
possible
precisely
control
frequency
absorptivity
peak,
thereby
demonstrating
dynamic
tunability
absorber.
high
symmetry
periodic
arrangement
ensures
insensitivity
polarization
angle
range
0°
90°,
making
extremely
valuable
practical
applications.
In
addition,
exhibits
very
sensitivity
changes
ambient
refractive
index
with
maximum
3.205
THz/RIU,
quality
factor
(FOM)
11.3011
RIU−1,
Q-Factor
48.61.
It
has
broad
application
prospects
fields
sensors,
optoelectronic
devices,
terahertz
imaging.
Photonics,
Journal Year:
2025,
Volume and Issue:
12(2), P. 121 - 121
Published: Jan. 29, 2025
Graphene
oxide
(GO)
has
emerged
as
a
carbon-based
nanomaterial
providing
different
pathway
to
graphene.
One
of
its
most
notable
features
is
the
ability
partially
reduce
it,
resulting
in
graphene-like
sheets
through
elimination
oxygen-including
functional
groups.
In
this
paper,
effect
localized
interactions
an
Ag/GO/Au
multilayer
system
was
studied
explore
potential
for
photonic
applications.
GO
dip-coated
onto
magnetron-sputtered
silver,
followed
by
deposition
thin
gold
film
form
structure.
Micro-Raman
Spectroscopy,
SEM
and
Variable
Angle
Ellipsometry
(VASE)
measurements
were
performed
on
An
interesting
behavior
deposited
silver
with
formation
Ag
nanostructures
top
layer
reported.
addition
typical
bands,
analysis
reveals
peaks
such
1478
cm−1
band,
indicating
transition
from
sp3
sp2
hybridization,
confirming
partial
reduction
GO.
Additionally,
calculations
based
effective
medium
theory
(EMT)
highlight
Ag/GO
structures
hyperbolic
metamaterials
photonics.
The
exhibits
dielectric
up
323
nm,
transitions
type
I
HMM
between
400
nm
undergoes
Epsilon
Near
Zero
Pole
(ENZP)
at
II
behavior.
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.
Photonics,
Journal Year:
2025,
Volume and Issue:
12(2), P. 148 - 148
Published: Feb. 12, 2025
We
propose
a
highly
efficient
broadband
tunable
metamaterial
infrared
absorption
device.
The
design
is
modeled
using
the
three-dimensional
finite
element
method
for
results
show
that
device
captures
over
90%
of
light
in
wavelength
range
from
6.10
μm
to
17.42
μm.
utilize
VO2’s
phase
change
property
adjust
device,
allowing
average
level
vary
between
20.61%
and
94.88%.
In
this
study,
we
analyze
electromagnetic
field
distribution
at
its
peak
point
find
high
achieved
through
both
surface
plasmon
resonance
Fabry–Perot
cavity
resonance.
structural
parameters
are
fine-tuned
parameter
scanning.
By
comparing
our
work
with
previous
studies,
demonstrate
superior
performance
design.
Additionally,
investigate
polarization
angle
incident
it
insensitive
these
factors.
Importantly,
simple
structure
broadens
potential
uses
photodetection,
stealth,
sensing.
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.
