Physical review. B./Physical review. B,
Год журнала:
2024,
Номер
109(8)
Опубликована: Фев. 29, 2024
In
this
paper,
we
elucidate
the
formation
of
bound
states
in
continuum
(BICs)
compound
grating
waveguide
structures
from
perspective
momentum
mismatch.
As
complex
lattice
reduces
to
a
simple
lattice,
excitable
guided
resonance
turns
into
an
unexcitable
BIC
due
Herein,
refer
state
as
mismatch
driven
BIC.
Interestingly,
incidence
changes
normal
oblique,
single
splits
dual
BICs
nonzero
tangential
incident
light.
Distinct
conventional
symmetry-protected
and
accidental
BICs,
lie
sections
photonic
bands.
Consequently,
factors
quasi-BICs
exhibit
angular
robustness
far
beyond
quasi-BICs.
Empowered
by
BIC,
pair
ellipsometric
phase
singularities
emerge.
Enabled
drastic
change,
ultrasensitive
refractive
index
sensing
can
be
achieved.
These
results
not
only
provide
unique
insights
relation
between
momentum,
phase,
but
also
offer
recipe
for
developing
high-performance
phase-based
optical
devices,
such
sensors,
wave
plates,
spatial
light
modulators.
Published
American
Physical
Society
2024
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Апрель 7, 2023
Optical
encryption
is
a
promising
approach
to
protecting
secret
information
owing
the
advantages
of
low-power
consumption,
parallel,
high-speed,
and
multi-dimensional
processing
capabilities.
Nevertheless,
conventional
strategies
generally
suffer
from
bulky
system
volume,
relatively
low
security
level,
redundant
measurement,
and/or
requirement
digital
decryption
algorithms.
Here,
we
propose
general
optical
strategy
dubbed
meta-optics-empowered
vector
visual
cryptography,
which
fully
exploits
abundant
degrees
freedom
light
as
well
spatial
dislocation
key
parameters,
significantly
upgrading
level.
We
also
demonstrate
meta-camera
that
can
implement
reversal
coding
procedure
for
real-time
imaging
display
hidden
information,
avoiding
measurement
post-processing.
Our
features
merits
compact
footprint,
high
security,
rapid
decryption,
may
open
an
avenue
anti-counterfeiting.
ACS Photonics,
Год журнала:
2024,
Номер
11(3), С. 816 - 865
Опубликована: Фев. 27, 2024
Metasurfaces
have
recently
risen
to
prominence
in
optical
research,
providing
unique
functionalities
that
can
be
used
for
imaging,
beam
forming,
holography,
polarimetry,
and
many
more,
while
keeping
device
dimensions
small.
Despite
the
fact
a
vast
range
of
basic
metasurface
designs
has
already
been
thoroughly
studied
literature,
number
metasurface-related
papers
is
still
growing
at
rapid
pace,
as
research
now
spreading
adjacent
fields,
including
computational
augmented
virtual
reality,
automotive,
display,
biosensing,
nonlinear,
quantum
topological
optics,
computing,
more.
At
same
time,
ability
metasurfaces
perform
functions
much
more
compact
systems
triggered
strong
constantly
interest
from
various
industries
greatly
benefit
availability
miniaturized,
highly
functional,
efficient
components
integrated
optoelectronic
low
cost.
This
creates
truly
opportunity
field
make
both
scientific
an
industrial
impact.
The
goal
this
Roadmap
mark
"golden
age"
define
future
directions
encourage
scientists
engineers
drive
development
toward
excellence
broad
adoption.
Laser & Photonics Review,
Год журнала:
2023,
Номер
17(4)
Опубликована: Янв. 29, 2023
Abstract
Bound
states
in
the
continuum
(BICs)
offer
novel
mechanisms
to
boost
quality
factor
(Q‐factor)
of
resonances.
Unfortunately,
current
studies
on
chiral
BICs
metasurfaces
suffer
from
a
fundamental
trade‐off
between
Q‐factor
and
circular
dichroism
(CD),
presenting
significant
hurdle
that
severely
limits
independent
control
CD
Q‐factors.
Here,
3D
plasmonic
are
numerically
demonstrated
overcome
high‐Q
quasi‐BIC
resonances
(Q
≈
938)
with
strong
(≈0.67)
mid‐infrared.
These
made
integrated‐resonance
units
consisting
twisted
vertical
split‐ring
resonator
(VSRR)
wall.
Importantly,
this
dissimilar
dimer
configuration
unlocks
new
degree
freedom
decouple
CD,
is,
can
be
relatively
independently
manipulated
by
height
wall
angle
VSRR,
respectively.
results
provide
paradigms
manipulate
advanced
chiroptical
responses,
various
applications
require
enhanced
light–matter
interaction.
Opto-Electronic Science,
Год журнала:
2023,
Номер
2(4), С. 230006 - 230006
Опубликована: Янв. 1, 2023
Bound
states
in
the
continuum
(BICs)
have
exhibited
extraordinary
properties
photonics
for
enhanced
light-matter
interactions
that
enable
appealing
applications
nonlinear
optics,
biosensors,
and
ultrafast
optical
switches.
The
most
common
strategy
to
apply
BICs
a
metasurface
is
by
breaking
symmetry
of
resonators
uniform
array
leaks
otherwise
uncoupled
mode
free
space
exhibits
an
inverse
quadratic
relationship
between
quality
factor
(Q)
asymmetry.
Here,
we
propose
scheme
further
reduce
scattering
losses
improve
robustness
symmetry-protected
decreasing
radiation
density
with
hybrid
BIC
lattice.
We
observe
significant
increase
radiative
Q
lattice
compared
larger
than
14.6.
In
lattice,
modes
are
transferred
Г
point
inherited
from
high
symmetric
X,
Y,
M
points
Brillouin
zone
reveal
as
multiple
Fano
resonances
far
field
would
find
hyperspectral
sensing.
This
work
initiates
novel
generalized
path
toward
reducing
improving
terms
engineering
release
rigid
requirements
fabrication
accuracy
benefit
optoelectronic
devices.
Nanophotonics,
Год журнала:
2023,
Номер
12(11), С. 2051 - 2060
Опубликована: Апрель 29, 2023
Symmetry-protected
bound
states
in
the
continuum
(SP-BICs)
are
one
of
most
intensively
studied
BICs.
Typically,
SP-BICs
must
be
converted
into
quasi-BICs
(QBICs)
by
breaking
unit
cell's
symmetry
so
that
they
can
accessed
external
excitation.
The
symmetry-broken
usually
results
a
varied
resonance
wavelength
QBICs
which
also
highly
sensitive
to
asymmetry
parameters.
In
this
work,
we
demonstrate
with
stable
realized
translational
an
all-dielectric
metasurface.
cell
metasurface
is
made
silicon
nanodisk
dimer.
Q-factor
precisely
tuned
changing
interspacing
two
nanodisks
while
their
quite
against
interspacing.
We
find
such
BICs
show
weak
dependence
on
shape
nanodisk.
Multiple
decompositions
indicate
toroidal
dipole
dominates
type
QBIC.
wavelengths
only
either
lattice
constants
or
radius
Finally,
present
experimental
demonstrations
QBIC
wavelength.
highest
measured
>3000.
Our
may
promising
applications
enhancing
light-matter
interaction.
Light Science & Applications,
Год журнала:
2023,
Номер
12(1)
Опубликована: Окт. 12, 2023
Abstract
The
realization
of
lossless
metasurfaces
with
true
chirality
crucially
requires
the
fabrication
three-dimensional
structures,
constraining
experimental
feasibility
and
hampering
practical
implementations.
Even
though
assembly
metallic
nanostructures
has
been
demonstrated
previously,
resulting
plasmonic
resonances
suffer
from
high
intrinsic
radiative
losses.
concept
photonic
bound
states
in
continuum
(BICs)
is
instrumental
for
tailoring
losses
diverse
geometries,
especially
when
implemented
using
dielectrics,
but
applications
have
so
far
limited
to
planar
structures.
Here,
we
introduce
a
novel
nanofabrication
approach
unlock
height
individual
resonators
within
all-dielectric
as
an
accessible
parameter
efficient
control
resonance
features
nanophotonic
functionalities.
In
particular,
realize
out-of-plane
symmetry
breaking
quasi-BIC
leverage
this
design
degree
freedom
demonstrate
optical
metasurface
maximum
that
responds
selectively
light
particular
circular
polarization
depending
on
structural
handedness.
Our
results
not
only
open
new
paradigm
BICs
chiral
nanophotonics,
also
promise
advances
generation
angular
momentum,
holographic
metasurfaces,
parity-time
symmetry-broken
systems.
Advanced Photonics,
Год журнала:
2023,
Номер
5(02)
Опубликована: Фев. 22, 2023
Integrated-resonant
units
(IRUs),
associating
various
meta-atoms,
resonant
modes,
and
functionalities
into
one
supercell,
have
been
promising
candidates
for
tailoring
composite
multifunctional
electromagnetic
responses
with
additional
degrees
of
freedom.
metadevices
can
overcome
many
bottlenecks
in
conventional
optical
devices,
such
as
broadband
achromatism,
efficiency
enhancement,
response
selectivity,
continuous
tunability,
offering
great
potential
performant
versatile
application
scenarios.
We
focus
on
the
recent
progress
integrated-resonant
metadevices.
Starting
from
design
principle
IRUs,
a
variety
IRU-based
characteristics
subsequent
practical
applications,
including
achromatic
imaging,
light-field
sensing,
polarization
detection,
orbital
angular
momentum
generation,
metaholography,
nanoprinting,
color
routing,
nonlinear
are
introduced.
Existing
challenges
this
field
opinions
future
research
directions
also
provided.
