Nanophotonics,
Journal Year:
2024,
Volume and Issue:
13(20), P. 3793 - 3803
Published: July 10, 2024
Abstract
Graphene-based
metamaterial
sensors
are
of
significant
research
value
for
detecting
food
preservatives
at
low
concentrations
due
to
their
extremely
high
sensitivity
levels.
In
this
work,
we
proposed
and
experimentally
demonstrated
an
anapole
resonance-based
graphene
metasurface
(An-graphene-Ms)
sensor
with
its
conductivity
altered
by
electrostatic
doping
effects
differentiating
between
two
preservatives,
sodium
benzoate
potassium
sorbate,
in
the
terahertz
region.
Sodium
benzoate,
owing
benzene
ring
structure,
established
π
–
stacking
interactions
-electrons
those
graphene,
amplifying
sensing
effect.
The
amplitude
changes
phase
differences
An-graphene-Ms
detection
were
greater
than
sorbate
same
concentration.
Additionally,
reveal
dependence
resonance
frequency
on
time
delay,
measured
signals
investigated
using
continuous
wavelet
transform
(CWT),
time-frequency
combination
was
performed.
2D
coefficient
intensity
cards
effectively
constructed
through
CWT,
which
also
presents
a
more
accurate
approach
distinguishing
determining
preservatives.
PhotoniX,
Journal Year:
2024,
Volume and Issue:
5(1)
Published: April 15, 2024
Abstract
The
molecular
fingerprint
sensing
technology
based
on
metasurface
has
unique
attraction
in
the
biomedical
field.
However,
terahertz
(THz)
band,
existing
designs
multi-pixel
or
angle
multiplexing
usually
require
more
analyte
amount
possess
a
narrower
tuning
bandwidth.
Here,
we
propose
novel
single-pixel
graphene
metasurface.
Based
synchronous
voltage
tuning,
this
enables
ultra-wideband
(
$$\sim$$
∼
1.5
THz)
enhancement
of
trace
analytes,
including
chiral
optical
isomers,
with
limit
detection
(LoD)
≤
0.64
μg/mm
2
.
signal
17.4
dB)
originates
from
electromagnetically
induced
transparency
(EIT)
effect
excited
by
metasurface,
and
ideal
overlap
between
light
field
constrained
single-layer
(SLG)
ultra-thin
analyte.
Meanwhile,
due
to
nonlinear
mechanism
absorption
envelope
distortion
is
inevitable.
To
solve
problem,
universal
spectrum
inversion
model
developed
for
first
time,
restoration
standard
fingerprints
reaches
R
max
≥
0.99.
In
addition,
asynchronous
provides
an
opportunity
realizing
dynamic
reconfiguration
EIT
resonance
slow
modulation
broadband
range.
This
work
builds
bridge
THz
potential
applications
active
spatial
modulators,
devices
imaging
equipments.
Nanophotonics,
Journal Year:
2025,
Volume and Issue:
14(8), P. 1045 - 1068
Published: Jan. 17, 2025
Abstract
Enhancing
the
sensitivity
of
biomedical
spectroscopy
is
crucial
for
advancing
medical
research
and
diagnostics.
Metasurfaces
have
emerged
as
powerful
platforms
enhancing
various
spectral
detection
technologies.
This
capability
arises
from
their
unparalleled
ability
to
improve
interactions
between
light
matter
through
localization
enhancement
fields.
In
this
article,
we
review
representative
approaches
recent
advances
in
metasurface-enhanced
spectroscopy.
We
provide
a
comprehensive
discussion
technologies
enhanced
by
metasurfaces,
including
infrared
spectroscopy,
Raman
fluorescence
other
modalities.
demonstrate
advantages
metasurfaces
improving
sensitivity,
reducing
limits,
achieving
rapid
biomolecule
while
discussing
challenges
associated
with
design,
preparation,
stability
procedures.
Finally,
explore
future
development
trends
biological
emphasize
wide-ranging
applications.
Photonics Research,
Journal Year:
2024,
Volume and Issue:
12(10), P. 2207 - 2207
Published: July 23, 2024
Quasi-bound
states
in
the
continuum
(quasi-BICs)
offer
an
excellent
platform
for
flexible
and
efficient
control
of
light-matter
interactions
by
breaking
structural
symmetry.
The
active
quasi-BIC
device
has
great
application
potential
fields
such
as
optical
sensing,
nonlinear
optics,
filters.
Herein,
we
experimentally
demonstrate
terahertz
(THz)
induced
polarization
conversion
a
liquid
crystal
(LC)-integrated
metasurface,
which
consists
symmetrically
broken
double-gap
split
ring
resonator
(DSRR),
LC
layer,
double
graphite
electrodes.
In
process
orientation
under
external
field,
realizes
from
OFF
state
to
ON
state.
state,
no
effect,
behaves
non-resonant
state;
but
exhibits
obvious
resonance.
Furthermore,
achieve
asymmetric
transmission
based
on
polarization-induced
modulation
precisely
at
resonance
position,
its
isolation
can
be
controlled
field.
study
dynamic
LC-integrated
metasurface
introduces
very
promising
route
THz
devices,
guarantees
applications
communications,
switching,
sensing
systems.
Terahertz
waves
are
gathering
attention
as
carrier
for
next-generation
wireless
communications
such
sixth-generation
communication
networks
and
autonomous
driving
systems.
Electromagnetic-wave
absorbers
the
terahertz-wave
region
necessary
to
ensure
information
security
avoid
interference
issues.
Herein
we
report
a
high-performance
absorber
composed
of
composite
metallic
λ-Ti3O5
insulating
TiO2
nanocrystals
(λ-Ti3O5@TiO2).
This
material
exhibits
strong
absorption
with
high
values
real
(permittivity,
ε')
imaginary
parts
(dielectric
loss,
ε″)
complex
dielectric
constant.
Furthermore,
tan(δ)
(≡
ε″/ε')
significantly
high,
ranging
from
0.50
0.76
in
frequency
range
between
0.1
1
THz.
An
ultrathin
film
thickness
48
μm
recorded
reflection
loss
-28
dB
(99.8%
terahertz
wave
is
absorbed
by
film).
A
small
has
yet
be
developed.
Not
only
does
present
exhibit
resistance
heat,
light,
water,
organic
solvents,
but
it
can
also
economically
fabricated
support
various
applications,
including
outdoor
uses.
Discover Nano,
Journal Year:
2025,
Volume and Issue:
20(1)
Published: Feb. 10, 2025
Graphene-based
terahertz
(THz)
metamaterials
(MMs)
are
at
the
forefront
of
high-sensitivity
sensing,
with
applications
spanning
biochemical
to
environmental
fields.
This
review
examines
recent
advances
in
graphene
MMs-based
THz
sensors,
covering
foundational
theories
and
innovative
designs,
from
complex
patterns
graphene-dielectric
graphene-metal
hybrids.
We
explore
ultra-trace
detection
enabled
by
$$\pi$$
-
stacking
mechanisms,
expanding
capabilities
beyond
conventional
refractive
index-based
methods.
Despite
significant
theoretical
progress,
practical
challenges
remain
due
material
constraints;
solutions
such
as
multilayer
structures
hybrid
low-mobility
designs
discussed
enhance
experimental
feasibility.
provides
a
comprehensive
perspective
on
evolving
impact
MMs,
positioning
them
transformative
tools
multidisciplinary
sensing.
Nanophotonics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 21, 2025
Abstract
Graphene
hosts
massless
Dirac
fermions
owing
to
its
linear
electronic
band
structure.
This
distinctive
feature
underpins
extraordinary
properties,
correlating
strong
light–matter
interactions
on
an
extreme
subwavelength
scale.
Over
the
past
decade,
intensive
investigations
have
transitioned
from
fundamental
graphene’s
optical
properties
practical
application
with
integration
of
graphene
into
metasurfaces,
opening
a
new
era
active
flat
optics.
In
this
review,
we
provide
comprehensive
overview
graphene-based
beginning
intrinsic
link
between
response
and
properties.
We
highlight
development
actively
tunable
platforms
devices,
including
efficient
modulators,
high-sensitivity
detectors,
advanced
biosensing
systems.
also
discuss
emerging
approaches
that
enable
ultrafast
all-optical
modulation
ultracompact
device
footprints,
pushing
boundaries
performance.
Finally,
explore
transformative
prospects
non-Hermitian
physics
inverse
design
strategies
as
novel
frameworks
for
optimizing
metasurface
configurations.
By
synergizing
tunability
innovative
methodologies,
metasurfaces
hold
immense
potential
bridge
gap
science
real-world
applications,
defining
frontier
in
next-generation
photonic
technologies.
