Photonics,
Journal Year:
2024,
Volume and Issue:
11(12), P. 1148 - 1148
Published: Dec. 6, 2024
Temperature
sensors
play
important
roles
in
wide-spreading
human
activities.
The
non-contact
method
of
using
temperature
offers
significant
advantages
but
faces
challenges
detection
precision.
In
this
work,
a
double-layer
asymmetric
terahertz
(THz)
metamaterial
combined
with
phase
transition
oxide
was
proposed
to
realize
sensor
high
sensitivity.
exhibited
band-stop
filtering
effects
the
simulated
transmission
spectra.
changes
induced
reversible
VO2,
resulting
altered
conductivity.
numerical
results
indicated
that
S21
parameter
increases
from
−44.33
dB
−4.78
at
frequency
1.22
THz
as
conductivity
VO2
film
10
5000
S/m,
achieving
modulation
depth
89%.
addition,
86
nm
thick
underwent
range
54.93
°C
66.93
°C,
sensitivity
1.82
dB/°C
for
sensing.
This
work
provided
great
insights
into
development
metamaterials
based
on
high-precision
measurement.
Photonics,
Journal Year:
2024,
Volume and Issue:
11(6), P. 529 - 529
Published: June 2, 2024
Metasurfaces
are
an
excellent
platform
for
terahertz
(THz)
sensing
applications,
enabling
highly
efficient
light–matter
interaction
and
overcoming
the
fundamental
disadvantage
of
relatively
long-wavelength
THz
range
(30–3000
μm),
which
limits
small
features.
The
current
focus
in
developing
metasurfaces
is
mostly
directed
toward
single-resonance
reconstruction
dielectric
constants
analyte
from
saturation
mode
induced
by
limited
volume
metasurface.
This
paper
presents
a
numerical
demonstration
using
multiresonance
metasurface
to
extract
thickness
refractive
index
deposited
film
without
sensor.
It
was
shown
that
property
enables
determination
characteristic
via
measurements
with
two
different
thicknesses
tracking
changes
resonances.
High-accuracy
parameter
retrieval
achieved
when
there
large
differences
thicknesses.
In
contrast
established
approach,
this
method
provides
way
avoid
thick
films.
This
article
presents
millimeter-wave
integrated
on-chip
antenna
with
bandpass
filter,
double
balanced
mixer
and
low
noise
amplifier
are
fabricated
tsmc
CMOS
technology.
The
dipole
balun
of
the
adopts
via-hole
structure
SIR
pseudo-interdigital
filter
utilizes.
proposed
antenna-bandpass
can
be
very
useful
for
design
60-GHz
radio-frequency
receiver.
IEEE Internet of Things Journal,
Journal Year:
2024,
Volume and Issue:
11(23), P. 37842 - 37856
Published: Aug. 8, 2024
Terahertz
(THz)
wireless
communication
has
emerged
as
a
front-line
technology
for
substantially
improving
the
data
rates
6G
networks.
However,
they
suffer
from
tremendous
path-attenuation
that
limits
distance.
Intelligent
reflecting
surface
(IRS)
is
an
excellent
cost-effective
enabling
THz
systems.
This
article
presents
comprehensive
analysis
of
IRS-empowered
system,
incorporating
detailed
channel
model
encompassing
deterministic
IRS
gain,
molecular
absorption
losses,
and
characteristics
sum
double
$\alpha
-\mu
$
fading.
The
considers
IRS-specific
parameters,
such
unit-cell
dimensions,
radiation
pattern,
array
factor,
accurate
received
signal
power
characterization.
For
statistical
analysis,
probability
density
function,
cumulative
distribution
moments
are
characterized
using
programmable
multivariate
Fox's
H-functions.
Using
these
derived
results,
exact
closed-form
solutions
outage
probability,
average
bit
error
rate,
ergodic
capacity
reported.
Additionally,
asymptotic
approximations
presented
deeper
insights.
Finally,
to
validate
accuracy
analytical
extensive
Monte-Carlo
simulations
conducted.
Multiple
results
investigate
various
design
aspects
proposed
system.
findings
demonstrate
significant
performance
gains
savings
thereby
making
feasible
highly
promising
future
Research Square (Research Square),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 14, 2024
Abstract
A
helically
twisted
photonic
crystal
fiber
(PCF)
gas
sensor
composed
of
12
hollow
pipes
around
the
core
in
cladding
region
is
proposed
and
examined
0.3-3.0
terahertz
(THz)
frequency
range
for
sensing
toxic
gases.
The
suggested
THz
optical
has
been
designed
simulated
using
finite-difference
eigenmode
(FDE)
method.
with
one
twist
along
50
cm-
exhibits
four
bands
very
low
loss
high
detection
percentage.
For
each
band
gases
nG
=
1.00,
1.02,
1.04,
1.06
1.08,
refractive
index
sensitivity
1450,
2250,
3000,
2550GHz/RIU
are
obtained,
respectively.
Furthermore,
transmission
figure
merit
(FOM)
have
obtained
as
10-4-10-2
1/cm
-
250
1/RIU,
Finally,
shown
to
be
a
good
candidate
owing
its
performance
simple
structure.
Sensors,
Journal Year:
2024,
Volume and Issue:
24(16), P. 5419 - 5419
Published: Aug. 22, 2024
In
broadband
terahertz
waves
generated
by
femtosecond
lasers,
spatial
chirp
will
be
simultaneously
produced
with
the
introduction
of
angular
dispersion.
The
characteristics
wave
directly
affect
frequency
response,
bandwidth
and
intensity
response
sensor.
To
enhance
capability
sensors,
it
is
necessary
to
control
improve
chirped
sources.
We
generate
a
via
optical
rectification
in
LiNbO3
prism
using
technique
pulse
front
tilt.
effect
pump-beam
spot
size
on
THz
generation
systematically
studied.
pump’s
manipulated
telescope
system.
With
pump
diameter
1.8
mm,
scanning
spectrum
narrower
divided
into
multiple
distinct
peaks.
contrast,
3.7
mm
leads
increased
efficiency
pulses.
Also,
we
investigate
underlying
properties
governing
pulses
varying
diameters.
