Optics Express,
Journal Year:
2024,
Volume and Issue:
32(20), P. 35030 - 35030
Published: Sept. 5, 2024
High-Q
resonances
excited
by
bound
states
in
a
continuum
(BIC)
metamaterial
have
sparked
increasing
research
interests
for
its
prospective
applications
sensing,
lasing,
and
nonlinear
optical
devices.
This
paper
introduces
quasi-BIC
supported
flexible
terahertz
(THz)
sensor
curvature
measurement.
The
symmetry-protected
BICs
based
on
metallic
rectangle
structures
thin
polyimide
substrate
are
designed.
After
introducing
defect
perturbations
along
the
x
y
directions
into
rectangle,
two
observable
quasi-BICs
would
be
-polarized
THz
waves,
respectively.
Moreover,
an
experimental
demonstration
of
sensing
performance
is
conducted
monitoring
spectral
evolution
response
to
bending
BIC
metamaterial.
measured
results
indicate
that
resonant
transmission
amplitude
sensitive
variations
applied
curvatures.
flexible,
easy
manufacturing,
highly-sensitive
micro
structured
paves
new
way
toward
developing
wearable
BICs-related
optoelectronic
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(45), P. 14466 - 14474
Published: Oct. 30, 2024
Optical
metasurfaces
have
revolutionized
analog
computing
and
image
processing
at
subwavelength
scales
with
faster
speed
lower
power
consumption.
They
typically
involve
spatial
differentiation
an
engineered
angular
dispersion.
Quasi-bound
states
in
the
continuum
(quasi-BICs)
emerged
as
powerful
tools
for
customizing
optical
resonances.
While
quasi-BICs
been
widely
used
high
Advanced Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 19, 2025
Abstract
Thermoelectric
materials
can
be
designed
to
support
optical
resonances
across
multiple
spectral
ranges
enable
ultra‐wideband
photodetection.
For
instance,
antimony
telluride
(Sb
2
Te
3
)
chalcogenide
exhibits
interband
plasmonic
in
the
visible
range
and
Mie
mid‐infrared
(mid‐IR)
range,
while
simultaneously
possessing
large
thermoelectric
Seebeck
coefficients
of
178
µV
K
−1
.
However,
metasurfaces
for
achieving
miniaturized
wavelength‐sensitive
detectors
have
not
been
explored
so
far,
especially
with
a
single
material
platform.
In
this
paper,
Sb
metasurface
devices
are
fabricated
achieve
≈97%
resonant
absorption
enabling
photodetectors
operating
an
spectrum,
from
mid‐IR.
Furthermore,
relying
on
linear
polarization‐sensitive
metasurface,
polarization‐selectivity
demonstrated.
This
work
provides
potential
platform
toward
portable
ultrawide
band
spectrometers
without
requiring
cryogenic
cooling,
environmental
sensing
applications.
ACS Photonics,
Journal Year:
2024,
Volume and Issue:
11(8), P. 3221 - 3231
Published: July 30, 2024
In
the
field
of
modern
optics,
capability
localizing
light
at
nanoscale
is
crucial.
Recently,
concept
bound
state
in
continuum
(BIC)
has
emerged,
demonstrating
highly
resonant
photonic
modes
within
lossless
dielectric
nanostructures.
On
contrary,
implementing
BICs
with
plasmonic
resonators,
despite
its
distinct
advantages
near-field
concentration,
been
less
preferred
due
to
inherent
material
losses.
This
study
proposes
a
novel
BIC
nanoresonator
utilizing
hybrid
metal–dielectric
bilayer
nanograting.
this
structure,
metallic
upper
nanograting
functions
as
concentrator
incident
wave,
whereas
lower
serves
main
resonator
for
concentrated
field,
exhibiting
negligible
loss.
design
facilitates
strong
coupling
between
three
induced
nanograting,
leading
emergence
exceptional
quality
factors.
Our
comprehensive
analysis,
including
theoretical,
numerical,
and
experimental
investigations,
reveals
that
attainment
followed
by
formation
BIC,
while
mode
hybridization
large
Rabi
splitting
energy
about
436
meV
are
observed.
As
result,
an
enhancement
more
than
8-fold
electromagnetic
achieved
silicon
compared
conventional
single-layer
resonator.
It
worth
noting
trade-off
intensity
storage
lifetime
confined
energies
addressed
principle
Γ-point
unveiled
via
temporal
spatial
coupled
theories
first
time,
best
our
knowledge.
findings
expected
enhance
functionalities
nanophotonic
applications.
Optics Express,
Journal Year:
2024,
Volume and Issue:
32(8), P. 14289 - 14289
Published: March 26, 2024
This
work
presents
a
bulk
refractive
index
sensor
based
on
quasi-bound
states
in
the
continuum
(BICs)
induced
by
broken
symmetries
metasurfaces.
The
symmetry
is
detuning
size
and
position
of
silicon
particles
periodically
arranged
an
array,
resulting
multiple
quasi-BIC
resonances.
We
investigate
sensing
characteristics
each
resonances
measuring
spectral
shift
response
to
changes
surrounding
medium.
In
addition,
we
reveal
range
different
through
simulations
involving
layer
deviating
increasing
thickness.
Interestingly,
show
very
responses,
which
describe
via
analysis
near-field.
contributes
development
highly
sensitive
selective
BIC-based
sensors
that
can
be
used
for
wide
applications.
Photonics,
Journal Year:
2025,
Volume and Issue:
12(1), P. 48 - 48
Published: Jan. 8, 2025
Photonic
biosensors
based
on
bound
states
in
the
continuum
(BIC)
resonant
modes
exhibit
a
transformative
potential
for
high-sensitivity,
label-free
detection
across
various
diagnostic
applications.
BIC-enabled
metasurfaces,
utilizing
dielectric,
plasmonic,
and
hybrid
structures,
achieve
ultra-high
Q-factors
amplify
target
molecule
interactions
functionalized
sensor
surfaces.
These
unique
properties
result
increased
refractive
index
sensitivity
low
limits,
essential
monitoring
biomolecules
clinical
diagnostics,
environmental
analysis,
food
safety.
Recent
advancements
metasurfaces
have
demonstrated
ultra-low
limits
zeptomolar
range,
making
these
devices
highly
promising
real-world
This
review
paper
critically
discusses
design
principles
of
BIC-based
biosensors,
emphasizing
key
factors
such
as
material
selection,
structural
asymmetry,
functionalization
strategies
that
enhance
both
specificity.
Additionally,
recent
fabrication
techniques
enable
precise
BIC
control
with
scalable
approaches
practical
biosensing
applications
are
examined.
Case
studies
demonstrate
effectiveness
real-time,
low-concentration
detection,
highlighting
their
versatility
adaptability.
Finally,
future
challenges
opportunities,
integration
microfluidics
point-of-care
testing
multiplexed
sensing,
underscoring
platforms
to
revolutionize
field
biosensing.
Nanomaterials,
Journal Year:
2025,
Volume and Issue:
15(2), P. 118 - 118
Published: Jan. 15, 2025
In
recent
years,
metal
surface
plasmon
resonance
sensors
and
dielectric
guided-mode
have
attracted
the
attention
of
researchers.
Metal
are
sensitive
to
environmental
disturbances
but
high
optical
losses,
while
low
losses
limited
sensitivity.
To
overcome
these
limitations,
hybrid
that
combine
advantages
were
proposed
achieve
a
sensitivity
Q
factor
at
same
time.
this
paper,
hollow
cylindrical
tetramer
array
was
designed,
effects
hole
radius,
external
height,
period,
incidence
angle,
polarization
angle
on
refractive
index
sensing
properties
quantitatively
analyzed
using
finite
difference
time
domain
method.
It
is
found
position
peaks
can
be
freely
tuned
in
visible
near-infrared
regions,
up
542.8
nm/RIU
achieved,
with
1495.1
figure
merit
1103.3
RIU-1.
The
metal-dielectric
nanostructured
provides
possibility
for
realization
high-performance
devices.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 26, 2025
Abstract
Photonics
bound
states
in
the
continuum
(BICs)
are
peculiar
localized
of
free‐space
waves,
unaffected
by
far‐field
radiation
loss.
Although
plasmonic
nano‐antennas
squeeze
optical
field
to
nanoscale
volumes,
engineering
emergence
quasi‐BICs
with
hotspots
remains
challenging.
Here,
origin
symmetry‐protected
(SP)
a
2D
system
silver‐filled
dimers,
quasi‐embedded
high‐index
dielectric
waveguide,
is
investigated
through
strong
coupling
between
photonic
and
modes.
By
tailoring
hybridizing
plasmonic/photonic
fractions,
trade‐off
selected
at
which
quasi‐BIC
exhibits
both
high
intrinsic
Q‐factor
near‐field
enhancement
because
dimer‐gap
hotspot
activation.
Not
only
loss
damped
but
configuration
sustaining
lattice
hotspots.
This
leads
an
advantageous
small
modal
volume
for
enhancing
light‐matter
interaction.
The
layout
nearly
embedded
dimers
designed
maximize
spatial
overlap
target
molecules,
reactive
sensing
efficiency.
architecture
evaluated
its
ability
detect
transactive
response
DNA‐binding
protein
43.
refractometric
sensitivity
outperforms
current
label‐free
biosensing
platforms,
reaching
zeptomolar
range.
approach
highlights
potential
combining
nanomaterials
advanced
technologies.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 6, 2025
Abstract
The
field
of
optical
chirality
has
achieved
remarkable
progress
with
the
quick
development
artificial
metasurfaces.
introduction
quasi‐bound
states
in
continuum
(QBIC)
into
chiral
devices
offers
a
groundbreaking
and
efficient
method
for
modulating
responses.
However,
existing
QBIC‐based
research
primarily
concentrates
on
dielectric
structures
also
encounters
challenges
such
as
complex
design
requirements
limitations
to
single‐frequency
band
operation.
In
this
work,
metallic
double‐layer
twisted
metasurface
is
proposed.
By
manipulating
single
degree
freedom
(DOF),
twist
angle,
QBIC
are
simultaneously
induced
at
two
frequency
bands.
Far‐field
multipole
decomposition
near‐field
analysis
reveal
that
QBICs
originated
from
electric
dipole
toroidal
moments.
Experimental
spectra
highly
agree
simulation
results,
confirming
efficacy
design.
Remarkably,
structure
exhibits
opposite
responses
different
To
highlight
device's
superiority,
dynamic
image
display
switched
by
or
polarization
state
demonstrated
simulation.
proposed
holds
potential
applications
enantiomer
sensing,
lasers,
nonlinear
filtering,
other
related
areas.
