Materials Research Express,
Journal Year:
2024,
Volume and Issue:
11(7), P. 075801 - 075801
Published: July 1, 2024
Abstract
Surface
plasmonic
waves
(SPWs),
which
propagate
along
metal-dielectric
interfaces,
play
a
pivotal
role
in
various
photonic
applications
such
as
highly
integrated
devices,
super-resolution
imaging,
high-sensitivity
sensing,
on-chip
systems,
etc.
The
ability
to
control
the
excitation
direction
of
SPWs
is
great
importance
these
applications.
In
this
work,
we
propose
terahertz
metasurface
device
whose
propagation
can
be
dynamically
tuned
at
source
by
exploiting
vanadium
dioxide
(VO
2
).
Under
circularly
polarized
light
incidence,
destructive
or
constructive
interference
formed
subwavelength
square
ring
slit
resonators
(SRSRs)
arrays,
resulting
unidirectional
SPWs.
By
adjusting
conductivity
VO
,
flexible
over
realized.
This
approach
significantly
enhances
level
compared
previous
traditional
polarization
method
only
modulated
state,
marking
notable
advancement
development
functional
devices
that
harness
power
Journal of Applied Physics,
Journal Year:
2025,
Volume and Issue:
137(2)
Published: Jan. 13, 2025
With
the
increasing
demand
for
devices
in
miniaturization,
accuracy,
and
low
power
consumption,
developing
microdevices
form
of
piezoelectric
thin
films
is
significant
microelectromechanical
systems
(MEMS)
applications.
Piezoelectric
offer
advantages
miniaturization
holding
immense
potential
MEMS,
especially
with
advancements
micro-nanomanufacturing
technologies.
In
this
review,
we
highlighted
compelling
properties
summarized
latest
research
progress
films,
an
emphasis
on
recent
advances
MEMS.
We
mainly
introduced
developments
different
types
MEMS
(piezo-MEMS),
along
descriptions
effects,
film
preparation,
properties,
device
indicators.
have
emphasized
comparison
materials
methods
improving
devices.
The
achievements
applications
future
development
are
also
reviewed.
Optica,
Journal Year:
2024,
Volume and Issue:
11(11), P. 1556 - 1556
Published: Oct. 15, 2024
Tunable
optical
metasurfaces
(MSs)
have
demonstrated
exceptional
capabilities
in
actively
manipulating
light
fields.
However,
most
existing
tunable
MSs
are
limited
to
controlling
only
one
functionality.
Here,
by
combining
a
MEMS
mirror
with
plasmonic
bilayer
MS
(BMS),
we
develop
an
electrically
driven
MEMS-BMS
platform
enabling
complete
reflection
phase
transformation
and
switching
between
two
encoded
functionalities
actuating
the
mirror.
This
capability
stems
from
different
responses
of
each
layer
at
distinct
separations,
due
evolving
topological
singularities
defined
parameter
space.
With
this
platform,
demonstrate
polarization-independent
for
reconfigurable
diffraction
gratings,
achieving
∼25%
efficiency,
∼0.75
contrast
850-nm
wavelength,
fast
response
(∼5µs).
The
arrangement
generating
vortex
beams
switchable
charges
±1
is
also
demonstrated,
evidenced
near-
far-field
interferograms.
Our
work
expands
scope
exploiting
dynamic
phases
arrangement,
paving
way
multifunctional
meta-optics.
Science Advances,
Journal Year:
2024,
Volume and Issue:
10(47)
Published: Nov. 20, 2024
Compared
to
conventional
lasers
limited
generating
static
modes,
mode-switchable
equipped
with
adjustable
optics
significantly
enhance
the
flexibility
and
versatility
of
coherent
light
sources.
However,
most
current
approaches
achieving
depend
on
conventional,
i.e.,
inherently
bulky
slow,
optical
components.
Here,
we
demonstrate
fiber
empowered
by
electrically
actuated
intracavity
microelectromechanical
system
(MEMS)–based
metasurface
(MEMS-OMS)
enabling
mode
switching
between
fundamental
Gaussian
vortex
modes
at
~1030
nm.
By
finely
adjusting
voltage
applied
MEMS
mirror,
high-contrast
(
l
=
0)
1,
2,
3,
5,
depending
OMS
arrangement)
laser
is
achieved,
featuring
high
purities
(>95%)
fast
responses
(~100
microseconds).
The
proposed
MEMS-OMS–enabled
configuration
provides
an
at-source
solution
for
high-purity
fast-switchable
potential
applications
ranging
from
advanced
imaging
tweezers,
machining,
intelligent
photonics.
Applied Physics Letters,
Journal Year:
2025,
Volume and Issue:
126(7)
Published: Feb. 17, 2025
Nanostructure-based
metasurfaces
provide
a
promising
route
for
arbitrarily
manipulating
light
waves,
especially
versatile
absorption.
Although
various
meta-absorbers
have
been
studied
perfect
absorption,
it
remains
challenge
to
achieve
high-contrast
polarization-dependent
absorption
with
dynamic
tunability.
Here,
dual-metal
hybrid
metasurface
is
demonstrated
polarization-selective
and
reflection
liquid
tuning
capabilities
in
the
infrared
band.
Based
on
metal–insulator–metal
architecture,
composed
of
Al/Ti
nanostrips
enables
an
intense
resonance
at
x-polarization
reflects
as
mirror
y-polarization,
thus
acting
high-performance
linear
polarizer.
The
peak
wavelength
can
be
continuously
tailored
from
1200
1850
nm
average
>
99%
by
scaling
unit-cell
period
metasurfaces.
Furthermore,
exhibits
large
range
switch
(>750
nm)
through
immersion
tuning,
its
above
99.5%.
proposed
liquid-tunable
promote
practical
technologies
polarizers,
photodetectors,
optical
imaging.
Advanced Photonics Research,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 26, 2025
A
mechanically
tunable
metamaterial
concept
for
transmissive
spectral
discrimination
within
the
long‐wavelength
infrared
(LWIR)
range
(8–12
μm)
is
proposed
and
validated.
The
consists
of
a
periodically
perforated
gold
membrane
that
exhibits
extraordinary
optical
transmission
(EOT)
effect,
combined
with
parallel
silicon
separated
by
an
air
gap.
This
structure
acts
as
band‐pass
filter,
its
position
highly
sensitive
to
separation
gap
between
membranes,
which
influences
resonance
conditions
EOT.
Numerical
simulations
predict
tunability
across
entire
LWIR
displacement
just
0.5
μm.
experimentally
demonstrated
through
vertical
electrostatic
actuation
relative
layer
facilitated
micro‐electromechanical
systems
(MEMS)
approach.
measured
fabricated
MEMS‐enabled,
spectrally
plasmonic
shows
good
agreement
numerically
modeled
filter
characteristics.
Further
refinement
this
method
could
pave
way
variety
low‐cost,
low‐power
miniature
devices,
enhancing
spectroscopy
multispectral
imaging
capabilities
in
thermal
range.
Nanophotonics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 31, 2025
Metasurfaces
have
attracted
considerable
interest
in
optical
encryption
due
to
their
remarkable
ability
manipulate
light
at
subwavelength
scales,
however
the
aspect
of
security
remains
an
area
requiring
deeper
exploration.
Here,
we
propose
and
demonstrate
metasurface-enabled
steganography
that
provides
dual-layer
information
protection.
A
secret
is
embedded
within
multiple
carrier
images
using
a
run-length
encoding
algorithm,
dispersing
data
safeguard
it
against
direct
observation
brute-force
attacks,
thereby
establishing
first
layer
security.
The
second
achieved
by
onto
silicon
metasurface,
leveraging
wavelength
polarization
generate
diverse
keys
post-steganography.
To
validate
proposed
scheme,
several
metasurface
samples
are
fabricated
characterized
visible
spectrum.
By
adjusting
various
combinations
keys,
three
encrypted
retrieved
with
high
fidelity
negligible
crosstalk,
concealed
successfully
extracted
through
corresponding
decryption
algorithm.
approach
enhances
hardware
level,
making
less
susceptible
leakage.
It
anticipated
demonstrated
advancement
will
hold
significant
potential
for
applications
anti-counterfeiting.
