Materials,
Год журнала:
2025,
Номер
18(11), С. 2601 - 2601
Опубликована: Июнь 3, 2025
In
this
article,
we
present
a
high-sensitivity
narrow-band
perfect
graphene
absorber
that
exhibits
excellent
tunability
across
multiple
bands.
The
top
layer
of
the
unit
is
composed
material,
and
shape
square
with
ring
structure
removed
from
middle.
A
SiO2
dielectric
located
in
middle,
gold
substrate
exists
at
bottom.
This
has
generated
five
absorption
peaks
6.08216
THz,
7.29058
9.34669
11.5471
13.0441
levels
are
98.24%,
98.03%,
99.55%,
98.87%,
99.99%,
respectively.
We
have
proved
advantages
our
model
by
comparing
influence
different
shapes
on
rate
model.
Then,
changed
relaxation
time
Fermi
energy
level
other
factors
such
as
refractive
index
to
prove
good
tunable
performance.
Finally,
calculated
sensitivity,
sensitivity
high
4508.75
GHZ/RIU.
Compared
previous
articles,
article
more
peaks,
higher
efficiency,
sensitivity.
proposed
paper
shows
great
potential
contribute
sensors,
photoelectric
detection,
communication,
related
fields.
Molecules,
Год журнала:
2025,
Номер
30(8), С. 1688 - 1688
Опубликована: Апрель 10, 2025
Due
to
the
equipartition
exciton
property
of
graphene
metamaterials,
researchers
have
applied
them
design
absorbers
and
developed
a
series
covering
different
wavebands
(including
narrowband
broadband).
In
this
paper,
an
absorber
based
on
surface-isotropic
excitations
was
designed
with
help
metamaterials
relevant
simulations.
The
exhibited
six
perfect
absorption
peaks
in
mid-infrared
band
had
extremely
simple
structure
consisting
only
three
layers:
gold
layer
at
bottom,
dielectric
made
silica
middle,
patterned
top.
This
possesses
excellent
tuning
ability,
by
applying
external
bias
layer,
Fermi
energy
level
can
be
adjusted,
thus
resonance
frequency
peak
tuned.
Meanwhile,
effect
relaxation
time
performance
investigated.
addition,
refractive
index
found
linearly
related
peak.
It
is
worth
mentioning
that
possessed
polarization
insensitivity
due
its
central
symmetry.
Even
when
incident
light
polarizations
over
wide
range
angles,
change
absorbance
negligible,
demonstrating
significant
angle
incidence.
sensor
characteristics
such
as
tunability,
insensitivity,
high
sensitivity.
paper
demonstrates
feasibility
six-frequency
opens
up
more
ideas
for
multi-frequency
sensors.
Sensors,
Год журнала:
2025,
Номер
25(9), С. 2647 - 2647
Опубликована: Апрель 22, 2025
This
research
introduces
a
biosensor
utilizing
surface
plasmon
resonance
in
photonic
crystal
fiber
(PCF)
configuration.
PCF
uses
fused
silica
as
the
base
material,
with
layer
of
gold
placed
over
U-channels
cross-section
to
create
resonance.
There
are
three
different
sizes
internal
optic
air
hole
diameters,
larger
channel
circle
below
u-channel
for
formation
an
energy
leakage
window.
COMSOL
software
6.0
assisted
us
tuning
structure
and
performance
study,
structural
parameters
analyzed
mainly
include
diameter,
spacing,
profundity
measurement
polished
layer,
nanoscale
size
variation
metal
films.
The
results
simulation
study
show
that
optical
sensor
achieves
refractive
index
(RI)
responsiveness
across
1.30
1.41
range,
RI
interval
1.40
1.41,
exhibits
largest
peak
shift,
its
highest
sensitivity
reaches
10,200
nm/RIU,
smallest
full
width
at
half
(FWHM)
corresponds
1.34
value
4.8
nm,
figure
merit
(FOM)
895.83
(1/RIU).
software,
was
used
simulate
changes
blood
corresponding
glucose
concentrations,
detection
concentrations
tested.
Then,
concentration
75
mg/dL–175
mg/dL
is
3750
where
maximum
5455
nm/RIU.
It
shows
can
be
applied
field
biomedical
applications,
convenience,
fast
response,
high
sensitivity,
it
has
great
potential
development
prospect
market.
