Physica Scripta,
Journal Year:
2024,
Volume and Issue:
99(2), P. 025517 - 025517
Published: Jan. 3, 2024
Abstract
A
device
constructed
from
metamaterials
is
proposed,
which
makes
asymmetric
transmission
and
reflection
achieved
in
addition
to
a
perfect
dual-band
unidirectional
reflectionlessness
at
THz
frequencies
for
linearly
polarized
incident
waves.
Owing
the
unique
structure
characteristics,
it
exhibits
an
excellent
performance
of
converting
linear
circular
polarization
multiple
frequencies.
Moreover,
maximum
PCR
reaches
99.94%,
ellipticity
approaches
1
eight
Additionally,
UR
AT
are
within
broad
ranges
incidence
angle
θ
distance
d
between
two
resonators.
Utilization
metamaterial
design
will
facilitate
multifunctionality
meta-device
promote
further
advancements
integrated
processes,
communication,
radar
other
fields.
Materials & Design,
Journal Year:
2024,
Volume and Issue:
237, P. 112631 - 112631
Published: Jan. 1, 2024
As
ultrathin
optical
elements
with
subwavelength
structures
densely
arranged,
planar
lens
or
called
metalens
can
effectively
focus
incident
wave.
Due
to
the
compact
design
and
wide
operating
frequency
of
metalens,
it
becomes
promising
in
applications
like
information
encryption,
imaging,
wireless
communication
fields.
However,
fabrication
large-aperture
is
still
time-consuming
costly
while
focusing
performances
are
commonly
tuned
by
introducing
active
materials
requiring
extra
stimuli,
such
as
laser
electrical
pulses.
In
this
study,
five
designs
metalenses
synthetic
rectangular
aperture
proposed
demonstrated
excellent
performances.
By
reconfiguring
aperture,
properties
lengths,
full
width
at
half
maximum
values,
modulation
transfer
function
be
great
flexibility.
With
a
polarization-dependent
phase-shifting
structure,
shows
different
wave
under
transverse
magnetic
field
electric
modes.
utilizing
spatial
multiplexing,
terahertz
variable
foci
based
on
stretchable
single-,
dual-
quad-axis
sparse
investigated
achieve
tunable
multifocal
These
provide
novel
strategy
that
reconfigure
substrate
make
multifunction
tunability,
which
show
space
telescope
areas.
Small Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 15, 2025
Volatile
organic
compounds
(VOCs)
are
a
class
of
with
high
vapor
pressure
and
low
boiling
points,
widely
present
in
both
natural
environments
human
activities.
VOCs
released
from
various
sources
not
only
contribute
to
environmental
pollution
but
also
pose
threats
ecosystems
health.
Moreover,
some
considered
biomarkers
exhaled
breath
can
be
utilized
identify
diseases.
Therefore,
monitoring
controlling
VOC
emissions
concentrations
crucial
for
safeguarding
the
environment
In
recent
years,
significant
advancements
have
been
achieved
micro‐electromechanical
system
(MEMS)‐based
sensing
optical
technologies,
offering
new
avenues
detection.
This
article
provides
comprehensive
overview
research
progress
MEMS
sensors,
focusing
on
their
mechanisms
classifications.
It
then
discusses
role
artificial
intelligence
enhancing
identification
quantification,
as
well
trends
toward
sensor
miniaturization
intelligence.
Furthermore,
highlights
diverse
applications
sensors
medical
diagnostics,
agricultural
food
testing,
Internet
Things.
Finally,
it
emphasizes
opportunities
challenges
associated
providing
valuable
insights
practical
applications.
Advanced Optical Materials,
Journal Year:
2022,
Volume and Issue:
10(13)
Published: May 13, 2022
Abstract
Deep
neural
networks
(DNNs)
have
shown
marked
achievements
across
numerous
research
and
commercial
settings.
Part
of
their
success
is
due
to
ability
“learn”
internal
representations
the
input
(
x
)
that
are
ideal
attain
an
accurate
approximation
()
some
unknown
function
f
is,
y
=
).
Despite
universal
capability,
a
drawback
DNNs
they
black
boxes,
it
how
or
why
work.
Thus,
physics
discovered
by
DNN
remains
hidden.
Here,
condition
causality
enforced
through
Lorentz
layer
incorporated
within
deep
network.
This
NN
(LNN)
takes
in
geometry
all‐dielectric
metasurface,
outputs
causal
frequency‐dependent
permittivity
permeability
.
Additionally,
this
LNN
gives
spatial
dispersion
k
inherent
effective
material
parameters,
as
well
terms,
which
constitute
both
The
learn
metasurface
demonstrated
several
examples,
results
compared
theory
simulations.
Advanced Optical Materials,
Journal Year:
2023,
Volume and Issue:
11(9)
Published: Feb. 26, 2023
Abstract
Graphene
has
attracted
great
interest
for
integrated
photonic
platforms
in
the
long‐wave
infrared
(LWIR)
spectroscopic
and
polarimetric
sensing
due
to
capability
of
on‐chip
integration,
fast
response,
broadband
operation.
However,
graphene
suffers
from
low
photoresponsivity
thus
poor
performance
weak
absorption.
Polarization
detection
using
is
hindered
by
its
small
in‐plane
anisotropy.
Here,
nanoantenna‐mediated
photodetectors
(NMGPDs)
are
proposed
enhance
responsivity
tailoring
nanoantenna
near‐field
distribution
generate
a
strong
photoresponse.
The
devices
demonstrate
high
6.3
V
W
−1
under
zero
bias
at
room
temperature
with
noise‐equivalent
power
1.6
nW
Hz
−1/2
.
Furthermore,
polarization
enabled
artificial
anisotropy
double
L‐shaped
nanoantennas.
LWIR
NMGPDs
achieve
subtle
polarization‐angle
down
0.05°
thanks
unusual
negative
ratio
−1.
To
advances
molecule
detection,
acetone
chosen
as
an
analyte
sensing.
show
limit
115
ppm,
dynamic
gas
response
6
s
real‐time
monitoring.
These
results
reveal
potential
device
multi‐functional
miniaturized
optoelectronic
platform
toward
environmental
monitoring
biomedical
screening.
Results in Physics,
Journal Year:
2023,
Volume and Issue:
46, P. 106323 - 106323
Published: March 1, 2023
Multifunctional
coding
metasurfaces
can
provide
more
options
for
highly
integrated
terahertz
modulators,
which
has
become
one
of
the
current
research
focus.
This
study
proposed
a
tunable
chiral
metasurface
based
on
Dirac
semimetal
(DSM).
Two
U-shaped
rings
placed
perpendicular
to
each
other
in
opening
direction
comprised
unit
cell.
Further,
multifunctional
application
region
was
realized
through
coding.
The
exhibited
strong
chirality
incident
circularly
polarized
light
with
circular
dichroism
(CD)
up
0.72
at
2.31
THz.
combination
Pancharatnam-Berry
(PB)
phase
aided
realization
wideband
switchable
vortex
beam
generator,
arbitrary
angular
deflection
tuning
beam,
and
multi-beam
splitting
operation
using
Fourier
convolution
operation.
In
addition,
near-field
imaging
applications
were
developed
by
encoding
cell
cells
according
their
amplitude.
results
this
are
expected
yield
promising
future
high-data-capacity
communication
systems,
multi-target
information
transmission,
controlled
imaging.
Nanomaterials,
Journal Year:
2023,
Volume and Issue:
13(16), P. 2377 - 2377
Published: Aug. 19, 2023
Infrared
absorption
spectroscopy
is
an
effective
tool
for
the
detection
and
identification
of
molecules.
However,
its
application
limited
by
low
infrared
cross-section
molecule,
resulting
in
sensitivity
a
poor
signal-to-noise
ratio.
Surface-Enhanced
Absorption
(SEIRA)
breakthrough
technique
that
exploits
field-enhancing
properties
periodic
nanostructures
to
amplify
vibrational
signals
trace
The
fascinating
SEIRA
technology
have
aroused
great
interest,
driving
diverse
sensing
applications.
In
this
review,
we
first
discuss
three
ways
performance
optimization,
including
material
selection,
enhancement,
bandwidth
improvement.
Subsequently,
potential
applications
fields
such
as
biomedicine
environmental
monitoring.
recent
years,
ushered
new
era
characterized
Internet
Things,
sensor
networks,
wearable
devices.
These
demands
spurred
pursuit
miniaturized
consolidated
systems
chips.
addition,
rise
machine
learning
has
injected
vitality
into
SEIRA,
bringing
smart
device
design
data
analysis
foreground.
final
section
review
explores
anticipated
trajectory
might
take,
highlighting
future
trends
possibilities.
Advanced Photonics Nexus,
Journal Year:
2024,
Volume and Issue:
3(01)
Published: Jan. 10, 2024
Carbon-based
materials,
such
as
graphene
and
carbon
nanotubes,
have
emerged
a
transformative
class
of
building
blocks
for
state-of-the-art
metamaterial
devices
due
to
their
excellent
flexibility,
light
weight,
tunability.
In
this
work,
tunable
carbon-based
metal-free
terahertz
(THz)
metasurface
with
ultrabroadband
absorption
is
proposed,
composed
alternating
graphite
patterns,
where
the
Fermi
level
adjusted
by
varying
applied
voltage
bias
achieve
characteristics.
particular,
when
1
eV,
coefficient
exceeds
90%
from
7.24
through
16.23
THz,
importantly,
bandwidth
reaches
much
8.99
THz.
addition,
it
polarization-insensitive
incident
waves
maintains
high
rate
at
an
angle
up
50
deg.
This
device
enjoys
higher
bandwidth,
rates,
performance
compared
conventional
absorbers
in
THz
regime
can
be
potentially
various
fields,
including
wave
sensing,
modulation,
well
wearable
health
care
devices,
biomedicine
detection.
