Bound
states
in
the
continuum
(BICs)
garnered
significant
interest
for
their
potential
to
create
new
types
of
nanophotonic
devices.
Most
prior
demonstrations
were
based
on
arrays
dielectric
resonators,
which
cannot
be
miniaturized
beyond
diffraction
limit,
reducing
applicability
BICs
advanced
functions.
Here,
we
demonstrate
and
quasi-BICs
high-quality
factor
phonon-polariton
resonances
isotopically
pure
h
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,
Год журнала:
2025,
Номер
14(8), С. 1045 - 1068
Опубликована: Янв. 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,
Год журнала:
2024,
Номер
12(10), С. 2207 - 2207
Опубликована: Июль 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.
Applied Physics Letters,
Год журнала:
2025,
Номер
126(19)
Опубликована: Май 12, 2025
Terahertz
programmable
metasurfaces
hold
significant
promise
for
next-generation
communications
due
to
their
capability
steer
electromagnetic
waves.
However,
most
existing
terahertz
operate
at
only
a
single
frequency,
leaving
much
of
the
vast
spectrum
underutilized.
In
this
study,
we
introduce
“butterfly”
dual-band
metasurface,
integrated
with
liquid
crystals,
designed
efficient
beam
steering.
By
applying
bias
voltages,
metasurface
achieves
phase
change
nearly
270°
two
distinct
frequencies,
∼400
and
∼700
GHz.
Our
experimental
results
demonstrate
that
butterfly
is
compatible
both
binary
ternary
coding
schemes
these
remarkably
enhancing
beam-steering
performance
expanding
spatial
coverage.
This
advancement
in
technology
marks
step
forward
harnessing
full
potential
spectrum,
opening
another
pathway
broadband
communication
imaging
applications.
Advanced Optical Materials,
Год журнала:
2024,
Номер
12(29)
Опубликована: Июль 22, 2024
Abstract
Van
der
Waals
(vdW)
heterojunctions
composed
of
GaN/graphene
have
high
transmittance
and
excellent
carrier
transport
properties.
The
combination
multidimensional
hybrid
with
metasurfaces
can
open
up
many
fascinating
prospects
for
novel
optical
components
over
a
broad
range
the
electromagnetic
spectrum.
This
work
experimentally
demonstrates
multifunctional
temperature‐sensitive
meta‐device
based
on
vdW
integrated
metasurface.
Notably,
it
is
discovered
that
conductivity
increases
rapidly
when
excited
by
thermal
signal,
resulting
in
significant
change
relative
phase
retardation
as
well
amplitude
modulation
an
incident
THz
wave.
Then
continuous
wavelet
transform
used
instead
traditional
Fourier
transform,
two‐dimensional
coefficient
card
built
to
achieve
fast
detection
wider
temperature.
Simultaneously,
variation
temperature
dynamically
controls
contributions
multipoles,
eventually
determining
active
switching
exotic
anapoles
extreme
non‐radiative
confinement
highly
radiative
electric
dipoles.
offers
possibility
designing
chip‐scale
tuning
devices
promotes
potential
application
micro‐nanophotonic
sensors,
terahertz
modulators,
dynamic
near‐field
imaging.
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.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 30, 2025
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.
