Results in Physics,
Год журнала:
2023,
Номер
51, С. 106768 - 106768
Опубликована: Июль 20, 2023
We
propose
a
novel
approach
to
obtain
the
ultra-narrowband,
electrically
switchable,
and
high-efficiency
absorption
in
monolayer
graphene.
The
graphene
is
sandwiched
between
silica
substrate
square
array
of
silver
nanospheres,
which
covered
by
very
thick
layer.
fundamental
role
cover
layer
homogenize
surrounding
medium
thus
efficiently
exciting
lattice
plasmon
resonance.
resonance
arising
from
coupling
dipolar
nanospheres
zero-order
diffraction
wave
at
Wood
anomaly
can
enhance
electromagnetic
fields
surface,
greatly
improve
near-infrared
light
with
maximum
efficiency
up
45%.
Owing
low
radiation
loss
resonance,
linewidth
be
largely
compressed
only
several
nanometers
(3.2
nm
∼
7.4
nm).
Moreover,
our
proposed
nanostructures
has
nearly
100%
modulation
depth
exhibit
an
excellent
switching
property.
Our
work
will
helpful
for
some
graphene-based
photoelectric
devices.
Electronics,
Год журнала:
2023,
Номер
12(12), С. 2655 - 2655
Опубликована: Июнь 13, 2023
When
surface
plasmon
resonance
(SPR)
occurs,
the
incident
light
is
absorbed
by
of
SPR
structure,
thus
minimizing
intensity
reflected
light.
Therefore,
method
adopted
in
this
paper
to
achieve
perfect
absorption
absorbent.
In
paper,
we
first
propose
a
multi-frequency
broadband
absorber
structure
based
on
graphene
SPR,
which
uses
continuous
patterned
frequency
spectrum
form
absorption.
simulation,
sandwich-stack
was
adopted,
whereby
situated
top
SiO2
layer
and
metal
layer.
The
broad-band
bands
were
obtained
as
4.14–4.38
THz,
5.78–6.36
7.87–8.66
THz
through
analog
simulation
finite-difference
time-domain
(FDTD)
solutions.
Then,
multi-layer
resonant
unit
superposition
combination
absorbing
units
responding
different
bands,
ultra-wideband
achieved.
data
results
illustrate
that
total
bandwidth
2.26
relative
Bw
equal
28.93%.
electric
field
X-Y
direction
band
analyzed,
respectively,
dynamic
tunability
studied.
Finally,
studied
whether
still
has
efficient
characteristics
for
two
polarization
modes
when
angle
changed
from
0°
70°.
model
proposed
potential
value
application
terahertz
photoelectric
detection,
filtering,
electromagnetic
shielding.
