Optical Materials Express,
Journal Year:
2024,
Volume and Issue:
14(11), P. 2612 - 2612
Published: Oct. 14, 2024
We
propose
a
photosensitive
silicon
terahertz
reconfigurable
metasurface
composed
of
substrate,
benzocyclobutene
dielectric
layer,
U-shaped
rod
and
metal
open
square
ring
layer.
When
the
conductivity
is
σ
Si
=
5
×
10
S/m,
exhibits
strong
circular
dichroism
under
incidence
circularly
polarized
wave,
with
(CD)
value
as
high
1
at
frequency
4.03
THz.
At
this
time,
linearly
wave
incidence,
linear
dichroism,
(LD)
values
0.71,
-0.57,
0.33
frequencies
6.76
THz,
7.45
8.39
respectively.
While
4
displays
circular-circular
polarization
converter,
conversion
rate
(PCR)
more
than
0.9
in
2.92-6.04
THz
2.94-5.68
band.
Advanced Physics Research,
Journal Year:
2024,
Volume and Issue:
3(11)
Published: June 24, 2024
Abstract
Metasurfaces,
as
2D
artificial
electromagnetic
materials,
play
a
pivotal
role
in
manipulating
waves
by
controlling
their
amplitude,
phase,
and
polarization.
Achieving
this
control
involves
designing
subwavelength
meta‐molecules
with
specific
geometries
periodicities.
In
the
context
of
microfluidic
metasurfaces,
optical
properties
can
be
dynamically
modulated
altering
either
geometric
structure
liquid
or
refractive
index
medium.
Leveraging
fluidity
metasurfaces
exhibit
remarkable
performance
terms
reconfigurability
flexibility.
These
not
only
establish
cutting‐edge
research
area
but
also
broaden
scope
applications
for
active
metasurface
devices.
Additionally,
integration
within
systems
has
led
to
novel
functionalities,
including
enhanced
particle
manipulation
sensor
technologies.
Compared
conventional
solid‐material‐based
offer
greater
design
freedom,
making
them
advantageous
diverse
fields
such
absorption,
sensing,
holographic
displays,
tunable
meta‐devices
like
flat
lenses
polarizers.
This
review
provides
insights
into
characteristics,
modulation
techniques,
potential
illuminating
both
current
landscape
promising
avenues
further
explorations.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(47)
Published: July 27, 2023
Abstract
Metasurfaces
with
engineered
phase
discontinuity
offer
extra
degrees
of
freedom
to
control
the
angular
spectrum
characteristics
light
and
can
be
used
construct
planar
metalenses
a
variety
anomalous
functionalities.
Here,
off‐resonance
spin‐locked
metasurfaces
empowered
by
quasi‐bound
states
in
continuum
are
reported,
order
achieve
concept
hybridized
analog
computing
over
both
frequency
domains.
By
introducing
two
types
asymmetric
degrees,
high‐quality
resonance
symmetry‐protected
bound
emerges
an
image‐coupled
system.
Such
excited
broadband
scattering
spectrum,
promising
required
functions
for
scalar
multiplication
convolution
operations.
Off‐resonance
meta‐splitter
meta‐deflector
experimentally
implemented
verify
domains,
as
well
providing
advantage
high
robustness
against
interference
from
environment.
Optical
spatial‐frequency
processing
engineering
is
also
discussed.
The
findings
provide
alternative
approach
toward
optical
multi‐domains.
Abstract
Dielectric
metasurfaces
are
highly
sought‐after
since
they
have
found
a
variety
of
linear
and
nonlinear
applications.
Here,
novel
transmission
modulation
is
presented
for
pulsed
laser
generation
by
directly
exploiting
the
enhanced
Kerr
effect
from
periodic
array
silicon
nanodisks.
The
Mie
resonance
unit
cells
enhances
material
redshifted
latter,
so
that
metasurface
at
working
wavelength
strongly
modulated
(the
observed
depth
above
3%
under
moderate
exciting
power).
By
inserting
fabricated
as
self‐modulator
into
ring
cavity
fiber
laser,
stable
Q‐switched
pulse
output
achieved
with
duration
1.4
µs
repetition
rate
60
kHz.
This
work
opens
door
ultra‐thin
low‐loss
dielectric
to
efficiently
shape
operation
lasing
based
on
their
effects
flexible
propagation
manipulation.
Photonics,
Journal Year:
2024,
Volume and Issue:
11(5), P. 442 - 442
Published: May 9, 2024
The
interplay
between
two
paradigms,
artificial
intelligence
(AI)
and
optical
metasurfaces,
nowadays
appears
obvious
unavoidable.
AI
is
permeating
literally
all
facets
of
human
activity,
from
science
arts
to
everyday
life.
On
the
other
hand,
metasurfaces
offer
diverse
sophisticated
multifunctionalities,
many
which
appeared
impossible
only
a
short
time
ago.
use
for
optimization
general
approach
that
has
become
ubiquitous.
However,
here
we
are
witnessing
two-way
process—AI
improving
but
some
also
AI.
helps
design,
analyze
utilize
while
ensure
creation
all-optical
chips.
This
ensures
positive
feedback
where
each
enhances
one:
this
may
well
be
revolution
in
making.
A
vast
number
publications
already
cover
either
first
or
second
direction;
modest
includes
both.
an
attempt
make
reader-friendly
critical
overview
emerging
synergy.
It
succinctly
reviews
research
trends,
stressing
most
recent
findings.
Then,
it
considers
possible
future
developments
challenges.
author
hopes
broad
interdisciplinary
will
useful
both
dedicated
experts
scholarly
audience.
Journal of Physics D Applied Physics,
Journal Year:
2024,
Volume and Issue:
57(49), P. 493004 - 493004
Published: Aug. 14, 2024
Abstract
Chiroptical
metamaterials
have
attracted
considerable
attention
owing
to
their
exciting
opportunities
for
fundamental
research
and
practical
applications
over
the
past
20
years.
Through
designs,
chiroptical
response
of
chiral
can
be
several
orders
magnitude
higher
than
that
natural
materials.
therefore
represent
a
special
type
artificial
structures
unique
activities.
In
this
review,
we
present
comprehensive
overview
progresses
in
development
metamaterials.
metamaterial
progress
enables
applications,
including
asymmetric
transmission,
polarization
conversion,
absorber,
imaging,
sensor
emission.
We
also
review
fabrication
techniques
design
based
on
deep
learning.
conclusion,
possible
further
directions
field.
Journal of Applied Physics,
Journal Year:
2023,
Volume and Issue:
134(20)
Published: Nov. 27, 2023
At
present,
optical
anapole
resonances
in
nanostructures
have
attracted
increasing
attention
due
to
the
strong
field
confinement
and
substantially
suppressed
scattering.
This
study
provides
results
of
three-dimensional
finite-difference
time-domain
simulations
exhibiting
possibility
state
high
refractive
index
dielectric
nanohole
array
metasurfaces
having
different
profiles
holes
(square,
hexagon,
octagon).
Behavior
effective
Kerr
nonlinearity
vicinity
is
investigated.
Depending
on
geometry,
absolute
value
nonlinear
coefficient
metasurface
may
be
up
three
orders
magnitude
greater
than
that
unstructured
film.
A
square
transverse
section
preferable
for
effect
holey
metasurfaces.
The
random
rotation
representing
irregularity
examined.
As
a
result,
display
concrete
with
large
enhancement
nonlinearity.
Optics Letters,
Journal Year:
2024,
Volume and Issue:
49(18), P. 5099 - 5099
Published: Aug. 22, 2024
We
realize
the
observation
of
near-unity
nonreciprocal
polarized
transmission
via
bound
states
in
continuum
(BICs)
a
double-layer
grating
structure.
By
introducing
out-of-plane
perturbations
and
topological
defects
that
break
mirror
symmetry
between
upper
lower
layers,
far-field
polarization
momentum
space
are
inverted
vertically
horizontally,
showing
mirrored
characteristics
for
incident
channels
from
different
ports.
During
process
π/2
phase
inversion
occurs
Г-M
direction,
making
chirality
possible.
Utilizing
this
bidirectionally
tunable
spatiotemporal
transition
enables
multiple
modulations
opens
up
more
possibilities
asymmetric
light
manipulation
chiral
optical
effects.
Optics Letters,
Journal Year:
2023,
Volume and Issue:
48(24), P. 6589 - 6589
Published: Nov. 27, 2023
Ultracompact
devices
engineered
for
second-harmonic
generation
(SHG)
hold
a
significant
promise
across
diverse
spectrum
of
applications.
Here,
we
propose
merging
bound
state
in
the
continuum
at
an
off-Γ
point
reciprocal
space
with
anisotropic
materials
lithium
niobate.
Such
BIC
yields
profound
reduction
radiative
loss
and
scattering
losses
while
concurrently
exhibiting
substantial
enhancement
quality
factor.
As
result,
achieved
noteworthy
SHG
efficiency
(
η
=
3.7%)
incident
angle
θ
10°
when
pump
intensity
I
0
2
kW/cm
,
outperforming
alternative
nanostructures
designed
SHG.
This
research
contributes
valuable
insights
into
feasibility
metadevices
founded
on
principles
nanoengineering
applied
to
traditional
nonlinear
crystals.
advancements
considerable
development
compact,
high-performance
range
