Advanced Theory and Simulations,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 18, 2025
Abstract
In
nonlinear
photonics,
frequency
converter
devices
have
important
applications
including
efficient
wavelength
shifting,
advanced
optical
signal
processing,
and
enhanced
imaging
modalities.
This
study
presents
a
bowtie‐shaped
silicon
metasurface
designed
for
NIR
to
UV
conversion
via
third
harmonic
generation
(THG).
By
breaking
the
symmetry
of
excite
symmetry‐protected
BIC
(SP‐BIC)
modes
converting
them
quasi‐BIC
(q‐BIC)
states,
interaction
between
light
matter
is
enhanced.
The
are
also
sensitive
incident
polarization.
Achieving
polarization‐sensitive
structure
enables
development
compact,
high‐performance
polarization
control
that
essential
in
communications,
imaging,
sensing
technologies.
results
indicate
significant
improvement
efficiency
proposed
q‐BIC
based
Si‐metasurface
by
123
times
compared
same
thickness
unpatterned
film.
The
generalized
Kerker
effect
(GKE)
arising
from
the
interference
of
high-order
multipoles
has
attracted
more
interest
due
to
its
direct
correlation
with
various
functionalities
in
nanophotonics.
realization
GKE
at
oblique
incidence
is
highly
desired
yet
remains
underexplored.
Herein,
we
report
experimental
observation
by
leveraging
quasi-bound
states
continuum
(QBICs)
supported
a
silicon
metasurface.
low-Q
leaky
mode
resonance
interacts
one
high-Q
QBICs
under
incidence,
leading
formation
hybrid
magnetic
quadrupole
(MQ)–magnetic
dipole
(MD)
mode.
amplitude
MQ–MD
can
be
precisely
controlled
achieve
an
out-of-phase
condition
varying
incident
angle,
resulting
second
condition.
Our
results
reveal
that
associated
rich
multipole
resonances
provide
new
paradigm
for
tailoring
GKE,
suggesting
important
implications
advanced
metadevices.
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 17, 2025
Abstract
It
is
proposed
and
numerically
demonstrated
a
novel
strategy
to
achieve
lasing
generation
from
dual‐band
symmetry‐protected
bound
states
in
the
continuum
(BICs)
based
on
nanodisk
tetramer
metasurface.
The
method
involves
breaking
in‐plane
symmetry
of
metasurface
unit
cell
by
simple
introduction
air
holes
tetramers.
numerical
results
show
that
this
easy
fabricate
solution
enables
support
BICs
telecom‐band
range,
with
these
modes
evolving
into
quasi‐BICs
remarkably
high
quality
factors.
Furthermore,
resulting
device
exhibits
unique
characteristic
being
polarization‐independent
across
all
viewing
angles.
Finally,
adopted
gain
medium
provides
sufficient
optical
compensate
quasi‐BIC
mode
losses,
enabling
two
ultra‐low
pump
threshold
very
narrow
linewidth.
This
work
paves
way
for
metasurfaces
multiple
resonances,
holding
potential
transform
areas
such
as
low‐threshold
biosensing
delivering
improved
performance
broader
capabilities.
Nano Letters,
Год журнала:
2025,
Номер
25(9), С. 3613 - 3619
Опубликована: Фев. 21, 2025
Thermal
emission
from
blackbody
is
typically
incoherent
and
broadband.
Achieving
highly
coherent
thermal
source
while
eliminating
the
rainbow
effect
has
been
remaining
a
challenging
task.
In
our
study,
we
utilize
isolated
nature
of
bound
states
in
continuum
(BICs)
at
Γ
point
to
achieve
with
high
temporal
spatial
coherence.
Under
framework
coupled
mode
theory
(TCMT),
can
significantly
reduce
Q-factors
modes
outside
by
employing
far-field
coupling
different
polarization
channels
within
momentum
space,
thereby
suppressing
effect.
Our
design,
experimentally
validated
through
ternary
grating
structures,
demonstrates
centered
6.5
μm
23
nm
bandwidth,
confined
2°
angular
range.
This
advancement
holds
significant
implications
for
miniaturization
integration
radiation
devices,
potential
applications
infrared
imaging,
sensing,
energy
harvesting.
Optics Express,
Год журнала:
2025,
Номер
33(7), С. 15682 - 15682
Опубликована: Фев. 25, 2025
Metasurfaces
offer
a
powerful
platform
for
effective
light
manipulation,
which
is
crucial
advanced
optical
technologies.
While
designs
of
polarization-independent
structures
have
reduced
the
need
polarized
illumination,
they
are
often
limited
by
either
low
Q
factors
or
resonance
modulation.
Here,
we
design
and
experimentally
demonstrate
metasurface
with
quasi-bound
state
in
continuum
(quasi-BIC),
where
unit
cell
consists
four
silicon
squares
arranged
two-dimensional
array
properties
can
be
controlled
adjusting
edge
length
difference
between
different
squares.
Our
achieves
factor
approximately
100
modulation
around
50%.
This
work
addresses
common
limitation
previous
designs,
achieved
high
exceeding
200
less
than
10%,
leading
to
challenging
signal-to-noise
ratio
requirements,
strong
only
10,
limiting
confinement
fine-tuning
capabilities.
In
contrast,
our
ensures
that
signal
sharp
distinct
within
system,
reducing
demands
on
improving
robustness.
Experiments
show
consistent
performance
across
polarization
angles.
contributes
development
versatile
devices,
enhancing
potential
practical
application
BIC-based
areas
such
as
filtering
sensing.
Applied Physics Reviews,
Год журнала:
2025,
Номер
12(1)
Опубликована: Март 1, 2025
Bound
states
in
the
continuum
(BICs)
have
emerged
as
research
hotspots
optics
and
photonics,
offering
a
new
paradigm
for
achieving
extreme
field
localization
enhancing
light–matter
interactions.
Here,
we
establish
first
time
intrinsic
evolution
laws
of
Fabry–Pérot
bound
(FP-BICs),
revealing
that
Q
factor
is
inversely
proportional
to
square
phase/frequency
detuning
nonradiative
decay
rate,
enabling
directional
engineering
FP-BIC
resonances.
We
propose
an
all-dielectric
multilayer
film
metasurface
create
optical
resonator
its
perfectly
mirrored
counterpart,
inducing
FP-BICs
validating
conclusions.
experimentally
demonstrated
with
frequency
detuning,
maximum
610
visible.
Our
work
offers
novel
insights
into
BICs,
promising
inspire
exotic
phenomena
applications.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 27, 2025
Abstract
Optical
cryptography
leveraging
responsive
photonics
harbors
immense
potential
within
encryption
markets.
Nonetheless,
the
current
reliance
on
single
inherent
information
encryption/decryption
methods
hinders
advancements
in
achieving
high‐precision
and
multistage
data
security,
particularly
for
military‐grade
encryption.
Here,
a
water‐triggered
decryption
approach
visible
regime
is
proposed,
exploiting
precise
dynamic
regulation
of
quasi‐bound
states
continuum
(q‐BIC)
hydrogel
metagratings.
By
exploring
thermal
interactions
between
scanning
probe
hydrogels,
direct
one‐step
grayscale
patterning
hydrogels
has
been
realized,
allowing
flexible
design
delicate
1D
1.5D
Utilizing
mechanism,
sensitive
q‐BIC
resonance
can
be
switched
among
ON,
OFF,
intermediate
depending
humidity
levels,
thus
facilitating
optical
through
properties
hydrogels.
Finally,
Morse
code
designed
achieved
by
arranging
metagratings,
which
concealed
under
water
immersion.
During
process
(from
high
to
low
humidity),
active
shifting
camouflaged
enhance
security.
The
strategy,
along
with
patterning,
offers
promising
platform
encryption,
security
labels,
displays,
anti‐counterfeiting
measures.
