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.
Applied Physics Reviews,
Journal Year:
2024,
Volume and Issue:
11(2)
Published: April 10, 2024
Exploring
nanoscale
material
properties
through
light-matter
interactions
is
essential
to
unveil
new
phenomena
and
manipulate
materials
at
the
atomic
level,
paving
way
for
ground-breaking
advancements
in
nanotechnology
science.
Various
elementary
excitations
low-energy
modes
of
reside
terahertz
(THz)
range
electromagnetic
spectrum
(0.1–10
THz)
occur
over
various
spatial
temporal
scales.
However,
due
diffraction
limit,
a
slew
THz
studies
are
restricted
drawing
conclusions
from
spatially
varying
responses
around
half
probing
wavelengths,
i.e.,
tens
couple
hundred
micrometers.
To
address
this
fundamental
challenge,
scanning
near-field
optical
microscopy
(SNOM),
notably
scattering-type
SNOM
(s-SNOM),
combined
with
sources
has
been
employed
fueling
growing
interest
technique
across
multiple
disciplines.
This
review
(1)
provides
an
overview
system
developments
SNOM,
(2)
evaluates
current
approaches
understand
quantify
interactions,
(3)
explores
advances
applications,
especially
nano-scale
employing
s-SNOM,
(4)
envisions
future
challenges
potential
development
avenues
practical
use
s-SNOM.
Science Advances,
Journal Year:
2023,
Volume and Issue:
9(42)
Published: Oct. 18, 2023
Electrically
controlled
terahertz
(THz)
beamforming
antennas
are
essential
for
various
applications
such
as
wireless
communications,
security
checks,
and
radar
to
improve
coverage
information
capacity.
The
emerging
programmable
metasurface
provides
a
flexible,
cost-effective
platform
THz
beam
steering.
However,
scaling
arrays
achieve
high-gain
steering
faces
several
technical
challenges.
Here,
we
propose
pixelated
liquid
crystal
with
crossbar
structure,
thereby
increasing
the
array
scale
more
than
3000.
coding
pattern
on
device
is
generated
by
modulo-addition
of
sequences
top
bottom
layers.
We
experimentally
demonstrate
capable
active
deflection
in
upper
half-space.
This
scale-up
devices
opens
exciting
opportunities
pencil
beamforming,
high-speed
processing,
optical
computing.
Optical Materials Express,
Journal Year:
2023,
Volume and Issue:
13(11), P. 3287 - 3287
Published: Oct. 10, 2023
Increasing
the
average
power
of
broadband,
few-cycle
terahertz
(THz)
sources
is
currently
a
topic
intense
investigation,
fueled
by
recent
immense
progress
in
high
femtosecond
laser
driving
at
1030
nm.
However,
many
crucial
applications
would
benefit
not
only
from
an
increase
power,
but
also
ultra-broad
bandwidth,
while
maintaining
dynamic
range
these
frequencies.
This
calls
for
challenging
combination
repetition
rates
and
simultaneously.
Here,
we
discuss
promising
approach
enabled
organic
crystals
THz-generation.
Specifically,
this
review
article
discusses
advances
with
most
commonly
used
BNA,
DAST,
DSTMS,
OH1
HMQ-TMS.
We
place
special
emphasis
on
nonlinear
thermal
properties
future
directions
field.
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.
