Applied Sciences,
Journal Year:
2024,
Volume and Issue:
14(10), P. 3967 - 3967
Published: May 7, 2024
The
application
of
terahertz
(THz)
radiation
in
scientific
research
as
well
applied
and
commercial
technology
has
expanded
rapidly
recent
years.
One
example
is
the
progress
high-resolution
THz
spectroscopy
based
on
quantum
cascade
lasers,
which
enabled
new
observations
astronomy,
atmospheric
research,
plasma
diagnostics.
However,
lack
easy-to-use
miniaturised
detectors
hampered
development
compact
systems
out
laboratory
environment.
In
this
paper,
we
introduce
a
high-speed
pyroelectric
receiver
cryogen-free
detector
for
absorption
spectroscopy.
Its
performance
characterised
by
measurements
reference
gas
cell
(RGC)
with
ammonia
using
tunable
laser
at
approximately
4.75
light
source.
It
shown
that
can
record
spectra
up
to
281
Hz
without
any
artefacts
observed
spectral
profile,
results
reproduce
known
pressure
RGC.
This
demonstrates
be
reliably
used
an
alternative
helium-cooled
bolometers
range,
its
main
advantages
being
high
bandwidth,
compactness,
relatively
low
cost,
room-temperature
operation.
simplicity
sensitivity
make
key
component
systems.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Feb. 28, 2024
Abstract
Nowadays,
many
researchers
aim
to
fill
polymer
materials
with
inorganic
nanoparticles
enhance
the
properties
and
gain
merits
of
polymeric
host
matrix.
Sol–gel
synthesized
Co
3
O
4
are
subjected
different
doses
electron
beam
(10,
20,
30
kGy)
study
their
physiochemical
choose
optimized
our
Crosslinked
polyethylene
(XLPE)
has
been
filled
5
wt
%
un-irradiated
cobalt
oxide
using
melt
extruder
method.
The
structural,
optical,
magnetic,
electrical
XLPE/Co
nanocomposite
before
after
exposure
radiation
have
characterized.
crystallite
size
face-centered
cubic
spinel
confirmed
by
XRD
whereas
unique
truncated
octahedral
shape
obviously
appears
in
SEM
micrographs.
decreased
from
47.5
31.5
nm
upon
irradiation
at
a
dose
kGy,
significantly
18.5
filling
inside
XLPE
Related
oxidation
effect
beam,
2+
/Co
3+
ratio
on
surface
as
verified
XPS
technique.
This
consequently
caused
partial
elimination
oxygen
vacancies,
mainly
responsible
for
weak
ferromagnetic
behavior
its
nanoscale.
saturation
magnetization
depicted
VSM.
also
shown
but
coercive
field
(H
c
)
increased
112.57
175.72
G
matrix
135.18
irradiating
kGy.
ionic
conductivity
0.133
×
10
–7
2.198
–3
S/cm
while
slight
increase
is
observed
irradiation.
Abstract
Terahertz
(THz)
emission
spectroscopy
(TES)
has
emerged
as
a
highly
effective
and
versatile
technique
for
investigating
the
photoelectric
properties
of
diverse
materials
nonlinear
physical
processes
in
past
few
decades.
Concurrently,
research
on
two-dimensional
(2D)
experienced
substantial
growth
due
to
their
atomically
thin
structures,
exceptional
mechanical
optoelectronic
properties,
potential
applications
flexible
electronics,
sensing,
nanoelectronics.
Specifically,
these
offer
advantages
such
tunable
bandgap,
high
carrier
mobility,
wideband
optical
absorption,
relatively
short
lifetime.
By
applying
TES
investigate
2D
materials,
interfaces
heterostructures,
rich
information
about
interplay
among
photons,
charges,
phonons
spins
can
be
unfolded,
which
provides
fundamental
understanding
future
applications.
Thus
it
is
timely
review
underlying
THz
including
rectification,
photon-drag,
high-order
harmonic
generation
spin-to-charge
conversion,
showcasing
diversity
employed
unravel
complex
nature
materials.
Typical
based
emissions,
lasers,
ultrafast
imaging
biosensors,
are
also
discussed.
Step
further,
we
analyzed
unique
spintronic
terahertz
emitters
technological
advancements
development
new
mechanisms
leading
advanced
sources
characterized
by
wide
bandwidth,
power
integration,
suitable
industrial
commercial
The
continuous
advancement
integration
with
study
heterostructures
promise
revolutionize
different
areas,
basic
physics,
novel
devices,
chips
post-Moore’s
era.
Abstract
The
art
of
light
engineering
unveils
a
world
possibilities
through
the
meticulous
manipulation
photonic
properties
such
as
intensity,
phase,
and
polarization.
Precision
control
over
these
finds
application
in
variety
fields
spanning
communications,
light–matter
interactions,
laser
direct
writing,
imaging.
Terahertz
(THz)
range,
nestled
between
microwaves
infrared
light,
stands
out
for
its
remarkable
ability
to
propagate
with
minimal
losses
numerous
dielectric
materials
compounds,
making
THz
imaging
powerful
tool
noninvasive
inspection.
In
this
study,
rational
framework
design
optimal
assembly
nonparaxial
systems
is
established.
research
centered
on
lensless
composed
solely
high‐resistivity
silicon‐based
elements
Fresnel
zone
plate,
Fibonacci
lens,
Bessel
axicon,
Airy
all
fabricated
using
ablation
technology.
Through
comprehensive
examination
illumination
scattered
collection
from
raster‐scanned
samples
single‐pixel
detector
scheme,
are
evaluated
via
diverse
metrics
including
contrast,
resolution,
depth
field,
focus.
These
findings
chart
an
exciting
course
toward
development
compact
user‐friendly
where
sensors
optical
seamlessly
integrate
into
single
chip.
IEEE Access,
Journal Year:
2024,
Volume and Issue:
12, P. 21402 - 21419
Published: Jan. 1, 2024
Millimeter-wave
and
Terahertz
communications
consist
of
complex
analog
mixed-signal
transceivers
where
overall
system
performance
is
often
limited
by
the
weakest
performing
subsystem.
While
integrated
circuits
have
significantly
advanced,
future
5G
6G
transceiver
design
could
be
accelerated
including
artificial
intelligence.
In
this
combination,
circuit
operation
would
harness
machine
learning
to
identify,
characterize,
act
upon
variations
anomalies
in
performance.
Focusing
on
6G,
paper
investigates
solutions
for
a
unified
intelligent
transceiver:
conceptual
combination
traditional
subsystem,
supporting
digital
subsystem
that
enables
intelligence,
dedicated
feedback
circuitry
or
sensors
monitor
performance,
efficiency,
reliability.
Active
passive
components
propagation
channels
are
reviewed
based
their
merits
introducing
Holistically
broader
applicability,
conceptualizes
coins
notion
an
"intelligent
(IIS)",
which
brings
forward
novel
vision
approach
toward
context-aware
subsystems
dynamically
interact
with
ambient
varying
operating
conditions.
To
demonstrate
viability,
concatenates
select
set
measurement
results.
Abstract
Diamond
is
emerging
as
an
attractive
third‐generation
wide‐bandgap
semiconductor
for
future
on‐chip
nonlinear
photonics
and
quantum
optics
due
to
its
unique
thermal,
optical,
mechanical
properties.
However,
the
light‐driven
current
under
below‐band
gap
excitation
from
second‐order
optical
effect
in
diamond
still
challenging.
Herein,
a
giant
photocurrent
observed
chemical
vapor
deposition
(CVD)
by
utilizing
terahertz
(THz)
emission
spectroscopy.
This
ultrafast
originates
photon
drag
(PDE),
during
which
momentum
transfer
incident
photons
charge
carriers
at
rich
grain
boundaries
of
CVD
after
exclusive
subgap
π–π
*
transition
upon
femtosecond
laser
excitation.
Especially,
interplay
between
circular
linear
PDE
THz
generation
clarified
distinguished
elliptically
polarized
light
Furthermore,
picosecond
dynamics
these
are
also
verified
infrared
Owing
photon‐drag‐induced
photocurrent,
presents
highest
efficiency
compared
with
reported
carbon
allotropes,
expands
new
functionality
into
devices.
PRX Life,
Journal Year:
2025,
Volume and Issue:
3(1)
Published: March 27, 2025
Proteins
fold
to
a
specific
functional
conformation
with
densely
packed
hydrophobic
core
that
controls
their
stability.
We
develop
geometric,
yet
all-atom
model
for
proteins
explains
the
universal
packing
fraction
of
ϕc=0.55
found
in
experimental
measurements.
show
as
interactions
increase
relative
temperature,
novel
jamming
transition
occurs
when
exceeds
ϕc.
The
also
recapitulates
global
structure
since
it
can
accurately
refold
native-like
structures
from
partially
unfolded
states.
Bioengineering,
Journal Year:
2025,
Volume and Issue:
12(1), P. 45 - 45
Published: Jan. 8, 2025
Terahertz
(THz)
waves
reside
in
the
electromagnetic
spectrum
between
microwave
and
infrared
bands.
In
recent
decades,
THz
technology
has
demonstrated
its
potential
for
biomedical
applications.
With
highly
unique
characteristics
of
waves,
such
as
high
sensitivity
to
water
optimal
spatial
resolution
coupled
with
human
cornea,
content,
been
explored
a
modality
assess
corneas
corneal
diseases.
This
systematic
review
provides
an
overview
safety
profile
field
ophthalmology,
clinical
applications,
including
objective
evaluation
hydration,
tear
film,
dry
eye
disease,
endothelium,
elasticity,
scarring.
The
paper
also
presents
our
viewpoint
on
present
challenges
future
directions
prior
broader
integration
into
practice.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Jan. 2, 2024
Abstract
Terahertz
(THz)
radiation
will
play
a
pivotal
role
in
wireless
communications,
sensing,
spectroscopy
and
imaging
technologies
the
decades
to
come.
THz
emitters
receivers
should
thus
be
simplified
their
design
miniaturized
become
commodity.
In
this
work
we
demonstrate
scalable
photoconductive
based
on
horizontally-grown
InAs
nanowires
(NWs)
embedded
bow-tie
antenna
that
at
room
temperature.
The
NWs
provide
short
photoconductivity
lifetime
while
conserving
high
electron
mobility.
large
surface-to-volume
ratio
also
ensures
low
dark
current
thermal
noise,
compared
narrow-bandgap
bulk
devices.
By
engineering
NW
morphology,
exhibit
greatly
different
lifetimes,
enabling
detect
photons
via
both
direct
integrating
sampling
modes.
broadband
are
compatible
with
gating
lasers
across
entire
range
of
telecom
wavelengths
(1.2–1.6
μm)
ideal
for
inexpensive
all-optical
fibre-based
time-domain
systems.
devices
deterministically
positioned
by
lithography
wafer
scale,
opening
path
new
generation
commercial
receivers.
