Independent Control of Spectral and Directional Emissivity with Multilayer Structures
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 11, 2025
Abstract
Utilizing
micro‐nano
structures
to
achieve
directional
and
spectral
control
of
thermal
radiation
holds
significant
scientific
importance.
It
may
significantly
benefit
a
broad
range
applications,
including
infrared
light
sources,
detection,
waste
heat
utilization
thermophotovoltaics.
However,
existing
emitters
face
challenges
in
realizing
narrowband
emissivity
lack
independent
angular
selectivity.
This
study
develops
simple
but
novel
approach
emitter
design
that
enables
directionality
peak
radiation.
An
angle‐selective
filter
selective
are
selected
as
the
structural
components,
series
different
designed
show
advantage
tunability.
After
optimization
with
NSGA‐II
algorithm,
is
achieved,
offering
high
only
at
given
direction
wavelength.
seven
layers
demonstrates
maximum
0.97,
an
width
under
20°,
below
0.025
µm,
validated
by
angle‐resolved
measurements.
provides
straightforward
effective
route
for
designing
promising
applications
management.
Язык: Английский
Bio‐Mass Radiative Cooling Materials: Progress and Prospects
Advanced Sustainable Systems,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 8, 2024
Abstract
Radiative
cooling
(RC)
is
a
passive
technology
that
leverages
infrared
radiation
to
reduce
temperatures
without
external
energy
input,
presenting
crucial
approach
mitigating
global
warming
and
lowering
consumption.
Biomass‐based
RC
materials,
known
for
their
environmental
sustainability
abundance,
offer
promising
alternative
applications.
This
review
outlines
the
fundamental
principles
of
radiative
examines
recent
advancements
in
biomass‐based
such
as
natural
wood,
cellulose,
chitosan,
silk,
bioplastics.
Furthermore,
it
highlights
key
challenges
explores
future
development
prospects
this
field.
Язык: Английский
Shedding Light on the Mid‐Infrared Complex Refractive Index of Anodic Aluminum Oxide
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 16, 2024
Abstract
In
the
current
scientific
landscape,
understanding
of
optical
properties
in
mid‐infrared
(mid‐IR)
range
(3–30
µm)
is
crucial
simulations
and
models
to
explore
potential
materials
for
various
applications.
However,
due
challenges
associated
with
mid‐IR
characterization,
accurate
refractive
index
(
n
)
extinction
coefficient
κ
data
are
often
lacking
literature.
This
study
addresses
this
gap
by
investigating
spectra
anodic
aluminum
oxide
(AAO)
nanostructures
anodized
under
different
conditions,
using
two
distinct
approaches:
IR
ellipsometry
a
theoretical
model
based
on
multilayer
reflection
effective
medium.
The
results
demonstrate
strong
agreement:
anodizing
conditions
have
significant
influence
AAO
nanostructures.
These
differences
enable
emissivity
Al
foils,
which
align
closely
experimental
measurements.
approximation
versatile
extensible
broad
materials.
Different
tested,
namely,
sapphire,
polycarbonate
film,
polyethylene
terephthalate
(PET)
film
achieving
useful
qualitative
description.
paves
way
novel
approach
engineering
new
micro
nano‐optical
materials,
facilitating
their
evaluation
suitability
Язык: Английский