Sensors,
Год журнала:
2024,
Номер
24(11), С. 3649 - 3649
Опубликована: Июнь 4, 2024
Quasi-bound
state
in
the
continuum
(QBIC)
can
effectively
enhance
interaction
of
terahertz
(THz)
wave
with
matter
due
to
tunable
high-Q
property,
which
has
a
strong
potential
application
detection
low-concentration
biological
samples
THz
band.
In
this
paper,
novel
metamaterial
sensor
double-chain-separated
resonant
cavity
structure
based
on
QBIC
is
designed
and
fabricated.
The
process
excitation
mode
verified
structural
parameters
are
optimized
after
considering
ohmic
loss
by
simulations.
simulated
refractive
index
sensitivity
up
544
GHz/RIU,
much
higher
than
those
recently
reported
sensors.
proposed
confirmed
an
experiment
detecting
lithium
citrate
(LC)
bovine
serum
albumin
(BSA)
solutions.
limits
(LoDs)
obtained
be
0.0025
mg/mL
(12
μM)
for
LC
0.03125
(0.47
BSA,
respectively,
both
excel
over
most
results
previous
studies.
These
indicate
that
excellent
sensing
performances
well
applied
samples.
Optical Materials Express,
Год журнала:
2024,
Номер
14(6), С. 1509 - 1509
Опубликована: Май 6, 2024
In
this
paper,
we
proposed
a
terahertz
(THz)
metamaterial
sensor,
which
consists
of
an
array
with
two
mirrored
double
split
ring
resonators
(DSRRs)
in
one
unit
cell
deposited
on
lossless
polyimide
substrate.
The
THz
spectral
response
show
that
when
the
DSRRs
are
mirror
symmetric
and
center
simultaneously,
types
symmetry-protected
bound
states
continuum
(BICs)
can
be
generated
incident
polarization
unchanged.
When
gaps
short
or
long
arms
DSRRs,
different
modes
BIC
observed.
By
breaking
symmetry
structure
deviating
from
line
quasi-BICs
achieved,
provide
high
Q-factors
for
our
designed
sensor.
performance
sensor
is
also
evaluated,
has
characteristics
Q-factor,
sensitivity,
linearity.
integration
quasi-BIC
sensing
technology
will
help
solve
problems
faced
design
ultra-high
Q-factor
sensors
further
expand
applications
technology.
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 29, 2024
Abstract
Metamaterials
based
on
quasi‐bound
states
in
the
continuum
(qBICs)
with
manipulable
resonance
quality
(
Q
)
factors
have
provided
a
standout
platform
for
cutting‐edge
terahertz
(THz)
sensing
applications.
However,
most
so
far
been
implemented
as
conventional
metal
patch
structures
adjacent
substrate
layers,
incurring
limitation
of
insufficient
light‐matter
interaction
due
to
effects.
Here,
qBIC‐driven
metamaterials
substrate‐free
metallic
aperture
tailoring
interactions
and
exhibiting
near‐ideal
performance
is
introduced.
Specifically,
it
incorporated
ultrafast
femtosecond
laser
processing
technology
fabricate
H‐type
accessible
high‐contrast
factor
resonances
allowed
by
in‐plane
symmetry
breaking.
Correspondingly,
stronger
light
field
energies
are
applied
completely
eliminating
confinement
effect,
enabling
experimental
sensitivity
up
0.86
THz
RIU
−1
qBIC
resonance,
1.9
times
that
dipole
resonance.
Moreover,
high
achieved
optimized
asymmetry
parameter
exploited
detecting
ultrathin
layers
L‐proline
molecules
low
0.87
nmol.
It
envisioned
this
approach
will
deliver
insights
real‐time,
precise,
high‐performance
detection
trace
biomolecules,
open
new
perspectives
realizing
ideal
metadevices.
The
study
of
many
phenomena
in
the
terahertz
(THz)
frequency
spectral
range
has
emerged
as
a
promising
playground
modern
science
and
technology,
with
extensive
applications
high-speed
communication,
imaging,
sensing,
biosensing.
Many
THz
metamaterial
designs
explore
quantum
physics
embedded
into
classical
framework
exhibiting
various
unexpected
behaviors.
For
spatial
waves,
effects
inspired
by
include
electromagnetically
induced
transparency
(EIT),
Fano
resonance,
bound
states
continuum
(BICs),
exceptional
points
(EPs)
non-Hermitian
systems.
They
facilitate
realization
functional
metadevices
applications.
on-chip
physics-inspired
topological
metamaterials,
photonic
analogs
insulators,
can
ensure
robust,
low-loss
propagation
suppressed
backscattering.
These
trends
open
new
pathways
for
data
transmission
integrated
circuits,
being
crucial
upcoming
6G
7G
wireless
communication
technologies.
Here,
we
summarize
underlying
principles
metamaterials
highlight
latest
advances
their
application
band,
encompassing
both
metadevice
realizations.
Nanophotonics,
Год журнала:
2025,
Номер
14(3), С. 271 - 296
Опубликована: Янв. 30, 2025
Abstract
Terahertz
(THz)
technology
has
attracted
significant
global
interest,
particularly
in
sensing
applications,
due
to
its
nonionizing
feature
and
sensitivity
weak
interactions.
Recently,
owing
the
advantages
of
low
optical
loss
capability
support
both
electric
magnetic
high-quality
factor
(high-Q)
resonances,
dielectric
metasurfaces
have
emerged
as
a
powerful
platform
for
multiscenario
terahertz
applications.
This
review
summarizes
recent
advancements
metasurface-assisted
THz
sensing.
We
begin
with
an
overview
mechanisms
properties
high-Q
factors.
Next,
we
discuss
typical
fabrication
techniques
these
metasurfaces.
then
explore
diverse
applications
across
various
scenarios,
including
biomolecule
sensing,
biomedical
detection,
environmental
monitoring,
chiral
Finally,
provide
perspectives
on
future
development
this
promising
research
field.
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 12, 2025
Abstract
Optical
coherence
with
high
precision
and
sensitivity
holds
achievements
in
communication,
metrology,
sensing.
The
optical
vernier
effect
generated
by
the
dual‐comb
interference
highlights
technology
to
heighten
accuracy
sensitivity,
particularly
visible
infrared
bands.
However,
maturity
frequency
domain
of
may
overshadow
its
attributes
time
domain,
which
are
limited
enhancing
comprehensive
performance.
This
work
provides
a
lag
compensation
that
enables
hyperfine
spectrum
ultra‐resolution,
verified
cascading
terahertz
interferometer.
strategy
proves
71.4
times
improvement
resolution
beyond
intrinsic
resolution,
reaching
Nyquist
sampling
limit
without
necessitating
unique
materials
or
compromising
device
geometry.
Furthermore,
universal
Lag‐Interference‐Sensitivity
correlation
is
established
guide
an
ultra‐sensitivity
1.4
×
10
4
GHz·RIU
−1
within
0.2–1
THz
range,
defying
two
orders
magnitude
compared
existing
reports.
Finally,
application
biochemical
sensing,
2.63
GHz·mm
2
·ng
0.59
ng·mm
−2
,
outperforming
current
reports
stimulating
further
exploration
ultra‐sensitive
on‐chip
sensors,
demonstrated.
validation
appealing
scheme
for
metrology
high‐resolution
Abstract
This
article
introduces
a
new
terahertz
metasurface
based
on
modified
Jerusalem
cross.
The
geometry
of
the
basic
structural
element
is
modified,
depending
its
position
in
matrix.
dimension
change
varies
linearly
both
orthogonal
x
and
y
directions,
allowing
for
smooth
resonant
frequency
tuning
as
function
matrix
position.
proposed
layout
enables
within
range
0.44–1.24
THz.
structure
consists
three
layers:
silicon,
thin
film
silicon
dioxide,
aluminum.
A
numerical
analysis
performed
designed
metasurface,
followed
by
microtechnology-based
fabrication
experimental
validation
optimized
metasurfaces.
Good
agreement
simulated
measured
results
obtained.
tunable
may
apply
to
evaluation
dielectric
films.
