Optics Express,
Journal Year:
2024,
Volume and Issue:
32(27), P. 47843 - 47843
Published: Dec. 5, 2024
The
high
adaptability
and
flexibility
of
reconfigurable
cavity
filters
(RCFs)
provide
a
compelling
solution
for
signal
modulation
in
communication
systems.
However,
current
reports
on
these
are
predominantly
concentrated
within
the
frequency
range
few
GHz.
As
frequencies
continue
to
escalate,
there
is
pressing
need
that
can
operate
at
higher
frequencies.
This
study
presents
mechanical
RCF
operating
W-band
(75-110
GHz)
address
high-frequency
filters.
reconfigurability
filter
enhanced
by
adjusting
height
liquid
metal
posts
interchanging
different
(LM)
media,
thereby
augmenting
its
tuning
flexibility.
During
experiment,
we
observed
potential
dispersion
effects
LMs
near
100
GHz,
which
were
hypothetically
validated.
Finally,
tested
performance
with
single
or
double
LM
tubes
using
vector
network
analyzer
achieve
consistency
between
experimental
simulated
results.
offers
unique
sub-terahertz
systems
critical
requirements
dynamic
filtering
capabilities.
Photonics Insights,
Journal Year:
2023,
Volume and Issue:
2(4), P. R09 - R09
Published: Jan. 1, 2023
Diffractive
optical
elements
(DOEs)
are
intricately
designed
devices
with
the
purpose
of
manipulating
light
fields
by
precisely
modifying
their
wavefronts.
The
concept
DOEs
has
its
origins
dating
back
to
1948
when
D.
Gabor
first
introduced
holography.
Subsequently,
researchers
binary
(BOEs),
including
computer-generated
holograms
(CGHs),
as
a
distinct
category
within
realm
DOEs.
This
was
revolution
in
devices.
next
major
breakthrough
field
manipulation
occurred
during
early
21st
century,
marked
advent
metamaterials
and
metasurfaces.
Metasurfaces
particularly
appealing
due
ultra-thin,
ultra-compact
properties
capacity
exert
precise
control
over
virtually
every
aspect
fields,
amplitude,
phase,
polarization,
wavelength/frequency,
angular
momentum,
etc.
advancement
micro/nano-structures
also
enabled
various
applications
such
information
acquisition,
transmission,
storage,
processing,
display.
In
this
review,
we
cover
fundamental
science,
cutting-edge
technologies,
wide-ranging
associated
micro/nano-scale
for
regulating
fields.
We
delve
into
prevailing
challenges
pursuit
developing
viable
technology
real-world
applications.
Furthermore,
offer
insights
potential
future
research
trends
directions
manipulation.
Nanotechnology Reviews,
Journal Year:
2024,
Volume and Issue:
13(1)
Published: Jan. 1, 2024
Abstract
Terahertz
metasurface
(THz-MS)
biosensor
is
a
hybrid
technology
that
combines
terahertz
time-domain
spectroscopy
and
for
the
detection
of
biomolecules
cells.
Compared
with
traditional
strategies,
it
label-free,
non-invasive,
time-saving,
easy
to
operate.
However,
three
fundamental
issues,
namely,
low
sensitivity,
specificity,
drastic
water
absorption,
hinder
development
THz-MS
biosensors
clinical
application.
Recently,
numerous
studies
have
been
performed
solve
these
problems,
results
show
great
potential
sensitive
nucleotides,
proteins,
Therefore,
important
summarize
in
biomedical
detection.
In
this
review,
we
summarized
mechanism,
manufacturing,
implementation
biosensors.
Then,
strategies
improve
selectivity,
means
reduce
absorption
are
presented.
Sensitivity
can
be
improved
by
suppressing
electromagnetic
radiation
strengthening
interaction
between
target
molecules
meta-atoms.
Antibodies
aptamers
most
effective
improving
specificity.
Microfluidics
hydrogels
two
ways
absorption.
Subsequently,
applications
nucleotide,
cells
summarized.
Finally,
prospects
future
outlined.
Abstract
Non-radiative
optical
modes
attracted
enormous
attention
in
optics
due
to
strong
light
confinement
and
giant
Q-factor
at
its
spectral
position.
The
destructive
interference
of
multipoles
leads
zero
net-radiation
field
trapping.
Such
radiationless
states
disappear
the
far-field,
localize
enhanced
near-field
can
be
excited
nano-structures.
On
other
hand,
turn
out
completely
confined
no
losses
discrete
point
radiation
continuum,
such
result
infinite
lifetime.
provide
a
suitable
platform
for
matter
interaction,
lasing,
boost
nonlinear
processes
state
regime.
These
are
widely
investigated
different
material
configurations
various
applications
both
linear
metasurfaces
which
briefly
discussed
this
review.
Proceedings of the IEEE,
Journal Year:
2024,
Volume and Issue:
112(8), P. 1033 - 1050
Published: May 10, 2024
Three-dimensional
(3-D)
printing,
also
known
as
additive
manufacturing,
provides
a
novel
and
cost-effective
approach
for
implementing
microwave
devices.
With
the
rapid
advancement
improved
manufacturing
resolution
of
3-D
printing
technology,
has
enabled
design
fabrication
electronic
devices
in
higher
terahertz
(THz)
frequency
bands,
contributing
to
bridging
gap
between
microwaves
photonics.
Simultaneously,
metalenses
have
garnered
significant
attention
due
their
ability
shape
electromagnetic
(EM)
wavefronts.
Metalens
technology
offers
promising
solution
wave
focusing,
surpassing
traditional
dielectric
lenses
with
advantages
such
reduced
weight
low
loss,
particularly
at
THz
frequencies.
In
this
article,
we
present
an
overview
development
3-D-printed
metalenses,
ranging
from
single
dual-layer
trilayer
configurations.
The
functionality
becomes
more
powerful,
replacing
conventional
light-focusing
single-layer
achieving
2-D
beam
scanning,
holographic
imaging,
reconfigurable
orbital
angular
momentum
(OAM)
enabling
focus
scanning
metalenses.
We
discuss
practical
measurement
technologies
briefly
outline
prospective
propel
metalens
forward.
Energies,
Journal Year:
2025,
Volume and Issue:
18(4), P. 840 - 840
Published: Feb. 11, 2025
The
majority
of
Internet
Things
(IoT)
devices
operate
with
limited
energy
resources,
making
it
essential
to
prioritize
sustainable
carbon
emissions
and
the
adoption
energy-efficient
IoT
solutions.
For
this
reason,
backscatter
communication
(BackCom)
are
widely
deployed
because
they
mostly
passive
that
harvest
from
RF
signals
modulate
information
onto
reflected
by
adjusting
impedance
load.
BackCom
have
a
simple
structure,
low
cost,
easy
deployment.
Although
plays
positive
role
in
improving
efficiency,
systems
deploy
many
EH
connect
numerous
peripherals
still
face
difficulties
terms
power
limitations
required
for
their
operation
is
almost
all
harvested
outside.
This
paper
comprehensively
reviews
approaches
solving
efficiency
issues
harvesting
(EH)
BackCom-enabled
systems,
which
mainly
include
high-efficiency
conversion
designs
tag,
renewable
harvesting,
waveform
design,
resource
allocation
readers.
We
also
investigate
various
green
cooperative
systems.
Finally,
we
indicate
new
applications
open
challenges
as
well
future
research
directions.
Journal of Physics Conference Series,
Journal Year:
2025,
Volume and Issue:
2991(1), P. 012022 - 012022
Published: April 1, 2025
Abstract
This
paper
puts
forward
a
novel
miniaturized,
low-profile,
and
wideband
slotted
microstrip
patch
array
with
the
capability
of
covering
Wi-Fi
6/6E
(ranging
from
5.15
to
5.83
GHz
5.925
7.125
GHz).
Through
etching
periodic
slots
on
traditional
antenna
modify
boundary
conditions,
both
TM
10
fundamental
mode
anti-phase
20
can
be
simultaneously
excited
within
wide
frequency
band.
Then,
2×2
is
designed.
The
antenna’s
bandwidth
further
enhanced
by
coupling
between
feed
network.
With
profile
0.06λ
0
(where
λ
open
space
wavelength
at
center
frequency),
has
-10
dB
impedance
34.1%
(between
5.1
7.2
research
findings
demonstrate
substantial
application
potential
in
various
Wi-Fi-enabled
devices.
Journal of Applied Physics,
Journal Year:
2024,
Volume and Issue:
136(5)
Published: Aug. 1, 2024
Given
the
significant
progress
in
field
of
meta-lenses
over
past
decade,
tunable
have
garnered
considerable
attention
for
their
flexible
functionality.
Various
mechanisms
been
developed
to
realize
high-performance
meta-lenses,
including
electricity,
strain,
thermal
effects,
and
materials,
such
as
phase-change
materials
liquid
crystals.
However,
currently,
most
are
limited
discrete
focal
lengths,
typically
only
involving
two
spots,
potential
Ge2Sb2Te5,
Sb2S3,
etc.,
has
not
yet
fully
exploited.
Here,
we
propose
a
design
approach
achieve
with
continuous
length
manipulation
working
at
1550
nm
based
on
(Sb2S3).
The
can
be
gradually
tuned
from
35
55
μm
during
conversion
process
between
crystalline
amorphous
states.
meta-atoms
rectangular
shapes
different
sizes
orientations
provide
certain
phase
compensations
propagation
Pancharatnam–Berry
phases,
respectively.
Airy
beam,
Bessel
deflection
meta-lens
spot
also
demonstrated
show
universality
proposed
design.
This
endeavor
will
lay
groundwork
meta-devices,
thereby
streamlining
integration
into
infrared
systems.
Fundamental Research,
Journal Year:
2024,
Volume and Issue:
5(2), P. 556 - 570
Published: Nov. 12, 2024
Due
to
the
exponentially
growing
global
mobile
data
of
wireless
communications
evolving
from
5
G
6
in
recent
years,
research
activities
leveraging
terahertz
(THz)
waves
obtain
larger
channel
capacities
have
shown
an
ever-increasing
pace
and
reached
unprecedented
height
than
before.
Historically,
past
few
decades
already
witnessed
much
progress
THz
generation
detection
technologies,
which
been
recognized
for
a
long
time
as
bottleneck
preventing
being
tamed
by
human
beings.
However,
importance
developing
advanced
components
such
antennas,
transmission
lines,
filters,
power
amplimers,
etc.,
constitute
basic
building
blocks
system,
should
not
be
overlooked
sake
exploiting
spectra
future
communications,
sensing
imaging
applications.
While
producing
scannable
highly-directive
antenna
beam
proves
indispensable
period
microwaves,
significance
functionality
is
more
critical
era,
considering
that
intractable
challenges
severity
free-space
propagation
losses,
susceptibility
atmospheric
environments,
unavailability
efficient
signal
sources.
This
article
structured
under
this
background,
dedicated
reviewing
several
enabling
beam-scanning
concepts,
structures,
architectures
developed
systems.
Specifically,
we
divide
these
solutions
into
four
groups
based
on
different
mechanisms,
i.e.,
mechanical
motion,
phased
array,
frequency
beam-scanning,
reconfigurable
metasurfaces.
