Sensors,
Год журнала:
2024,
Номер
24(23), С. 7781 - 7781
Опубликована: Дек. 5, 2024
Single-molecule
fluorescence
spectroscopy
offers
unique
capabilities
for
the
low-concentration
sensing
and
probing
of
molecular
dynmics.
However,
employing
such
a
methodology
versatile
diagnostics
under
point-of-care
demands
device
miniaturization
to
lab-on-a-chip
size.
In
this
study,
we
numerically
design
metalenses
with
high
numerical
aperture
(NA
=
1.1),
which
are
composed
silicon
nitride
nanostructures
deposited
on
waveguide
can
selectively
focus
guided
light
into
an
aqueous
solution
at
two
wavelengths
interest
in
spectral
range
500-780
nm.
Despite
severe
chromatic
focal
shift
lateral
directions
owing
wavelength-dependent
propagation
constant
waveguide,
segmented
on-chip
provide
perfectly
overlapping
volumes
that
meet
requirements
epi-fluorescence
collection.
We
demonstrate
molecule
detection
efficiencies
designed
excitation
emission
ATTO
490LS,
Alexa
555,
APC-Cy7
tandem
fluorophores
sufficient
collect
several
thousand
photons
per
second
modest
rate
constants.
Such
sensitivity
provides
reliable
diffusion
correlation
analysis
single
molecules
chip
extract
their
concentration
properties
nanomolar
range.
Achromatic
open
new
avenues
developing
ultra-compact
sensitive
devices
precision
medicine
environmental
monitoring.
Dalton Transactions,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
In
this
paper,
a
vanadium
dioxide
(VO2)-based
terahertz
device
is
proposed
to
realize
the
conversion
between
broadband
absorption
and
transmission
functions,
including
VO2
bottom
layer,
dielectric
layer
pattern
in
three-layer
structure.
With
change
of
conductivity,
metamaterial
can
switch
transmission.
When
exhibits
transmission,
it
has
high
transmittance
90%
for
waves
5.6
THz
8.7
frequency
band.
absorption,
3.66
9.98
Furthermore,
with
increasing
peak
decreases
from
93.8%
0%
increases
1%
99.5%.
The
impedance
matching
theory
invoked
physical
mechanism
elucidated
by
analyzing
surface
electric
field
device.
By
studying
characteristics
different
incidence
polarization
angles,
insensitive
good
performance
over
large
angles.
Compared
other
absorbers
metamaterials,
structure
study
unique
design
diverse
functions
play
an
important
role
various
fields
such
as
communications,
electromagnetic
stealth,
sensors,
thermal
emission
devices.
Nanophotonics,
Год журнала:
2025,
Номер
14(8), С. 1171 - 1183
Опубликована: Фев. 6, 2025
Abstract
Hadamard
matrices,
composed
of
mutually
orthogonal
vectors,
are
widely
used
in
various
applications
due
to
their
orthogonality.
In
optical
imaging,
microscopy
has
been
applied
achieve
sectioning
by
separating
scattering
and
background
noise
from
desired
signals.
This
method
involves
sequential
illumination
using
patterns
subsequent
image
processing.
However,
it
typically
requires
costly
light
modulation
devices,
such
as
digital
micromirror
devices
(DMDs)
or
spatial
modulators
(SLMs),
generate
multiple
patterns.
this
study,
we
present
spectral
based
on
a
holographic
matasurface.
We
noticed
that
certain
repeat
within
other
under
specific
condition,
allowing
the
entire
set
be
reproduced
single
pattern.
finding
suggests
generating
pattern
is
sufficient
implement
microscopy.
To
demonstrate
this,
designed
metasurface
an
conducted
imaging
simulations.
Results
showed
metasurface-based
effectively
suppressed
signals,
resulting
clear
fluorescent
images.
Furthermore,
demonstrated
hyperspectral
can
achieved
with
dispersive
elements,
orthogonality
enables
resolve
information.
The
reconstructed
images
displayed
color
distribution
closely
matching
synthetic
ground
truth.
Our
findings
suggest
accomplished
without
capability
unattainable
standard
wide-field
microscopes.
sophisticated
metasurfaces
have
potential
replace
enhance
conventional
components,
anticipate
study
will
contribute
advancements
Photonics,
Год журнала:
2025,
Номер
12(2), С. 148 - 148
Опубликована: Фев. 12, 2025
We
propose
a
highly
efficient
broadband
tunable
metamaterial
infrared
absorption
device.
The
design
is
modeled
using
the
three-dimensional
finite
element
method
for
results
show
that
device
captures
over
90%
of
light
in
wavelength
range
from
6.10
μm
to
17.42
μm.
utilize
VO2’s
phase
change
property
adjust
device,
allowing
average
level
vary
between
20.61%
and
94.88%.
In
this
study,
we
analyze
electromagnetic
field
distribution
at
its
peak
point
find
high
achieved
through
both
surface
plasmon
resonance
Fabry–Perot
cavity
resonance.
structural
parameters
are
fine-tuned
parameter
scanning.
By
comparing
our
work
with
previous
studies,
demonstrate
superior
performance
design.
Additionally,
investigate
polarization
angle
incident
it
insensitive
these
factors.
Importantly,
simple
structure
broadens
potential
uses
photodetection,
stealth,
sensing.
Dalton Transactions,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
This
article
designs
a
dynamic
thermal
emitter
based
on
phase
change
material
VO
2
.
structure
avoids
emission
loss
at
low
temperatures
and
increases
heat
dissipation
high
temperatures.
Coatings,
Год журнала:
2025,
Номер
15(2), С. 243 - 243
Опубликована: Фев. 19, 2025
As
a
widely
used
clean
energy
source,
solar
has
demonstrated
significant
promise
across
various
applications
due
to
its
wide
spectral
range
and
efficient
absorption
performance.
This
study
introduces
cross-structured,
ultra-broadband
absorber
utilizing
titanium
(Ti)
dioxide
(TiO2)
as
foundational
materials.
The
exhibits
over
90%
within
the
280–4000
nm
wavelength
surpasses
95%
in
broader
spectrum
from
542
3833
through
cavity
coupling
effect
of
incident
light
excitation
subsequent
initiation
surface
plasmon
resonance
mechanism,
thus
successfully
achieving
goal
broadband
high
absorption.
Through
finite
difference
time
domain
method
(FDTD)
simulation,
average
efficiency
reaches
97.38%
280
4000
nm,
it
is
97.75%
nm.
At
air
mass
1.5
(AM
1.5),
97.46%,
loss
2.54%,
which
extremely
efficiency.
In
addition,
thanks
material
considerations,
adopts
variety
high-temperature
resistant
materials,
making
thermal
radiation
environment
still
good;
specifically,
at
temperature
900
K,
can
reach
97.27%,
extreme
1800
K
temperature,
maintain
97.52%
radiation,
further
highlighting
excellent
stability
comprehensive
structure
optical
properties,
give
broad
applicability
an
ideal
or
emitter.
More
importantly,
insensitive
polarization
state
effectively
handle
lines
wide-angle
range.
photothermal
conversion
(Hereafter
referred
pc
efficiency)
sustain
elevated
level
under
conditions,
enables
flexibly
adapt
diverse
environmental
especially
suitable
for
integration
application
photovoltaic
systems,
broaden
potential
field
renewable
energy.
