Optical Materials Express,
Journal Year:
2023,
Volume and Issue:
13(10), P. 2822 - 2822
Published: Sept. 13, 2023
Multifunctional
and
multiplexed
terahertz
metasurfaces
have
attracted
considerable
attention
due
to
their
freedom
of
manipulating
waves
in
the
space
domain.
In
this
paper,
we
proposed
a
shared-aperture
channel
switchable
metasurface,
which
consists
top
elliptical
pattern
(i.e.,
vanadium
dioxide
(VO
2
)
gold
configuration),
an
intermediate
SiO
layer
bottom
metal
plate.
Several
coding-pattern
arrays
are
designed
achieve
multi-function
such
as
beam
splitting,
focusing,
deflection,
vortex
beam,
focusing
beams
based
on
Pancharatnam-Berry
(PB)
mechanism
combined
with
shared-aperture.
Furthermore,
single
dual
channels
can
be
switched
when
VO
undergoes
reversible
dielectric-metal
phase
transition
around
68°C
by
controlling
ambient
temperature.
The
full-wave
simulation
results
good
agreement
computational
predictions.
This
study
greatly
enriches
design
metasurface
devices
is
highly
expected
for
promising
practical
applications
future
multiplexing
systems.
Journal of the Optical Society of America B,
Journal Year:
2023,
Volume and Issue:
41(2), P. 341 - 341
Published: Dec. 15, 2023
Metasurfaces
(MSs)
are
being
extensively
researched
owing
to
their
ability
modulate
the
polarization
and
wavefront
of
electromagnetic
(EM)
waves
in
a
flexible
manner,
which
usually
offer
significant
advantages
including
ultra-thinness,
low
losses,
easy
fabrication.
However,
conventional
MSs
typically
operate
well
only
with
single
polarization.
Here,
we
propose
novel
design
strategy
for
terahertz
(THz)
reflective-mode
MS
that
relies
on
unit-cell
arrangement
combining
propagation
phase
geometric
phase.
Our
designed
can
achieve
multiple
manipulations
reflection
mode,
not
limited
circular
(CP)
transformation,
but
also
enabling
linear
(LP)
conversion.
The
consists
periodic
array
bilayered
metal
patterned
resonator
structures
sandwiched
by
dielectric
substrate.
metallic
is
made
outer
single-split-ring
(SSR)
C-shaped
slot
(CSS),
inner
double-split-ring
(DSR),
its
complementary
structure.
With
this
design,
capable
converting
LP
wave
orthogonal
counterpart
at
lower
frequency
(
f
1
=0.7THz)
after
reflection.
Additionally,
higher
2
=1.4THz),
proposed
convert
right-handed
CP
(RCP)
left-handed
(LCP)
upon
or
vice
versa.
π
full
coverage
be
achieved
independently
simultaneously
adjusting
opening
orientation
angles
SSR
based
phase,
angle
DSR
We
numerically
demonstrate
beam
deflection,
planar
focusing,
vortex
both
reflected
three
representative
provide
proof
concept.
These
findings
reveal
great
potential
multifunctional
devices
dual-polarization
imaging
communication
systems.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 20, 2024
Abstract
Metasurfaces
have
garnered
significant
interest
owing
to
their
inherent
advantages
over
traditional
optical
components
in
manipulating
electromagnetic
waves
unconventionally.
Among
the
fundamental
building
blocks
of
metasurfaces,
C‐shaped‐split‐ring
resonators
(CSRRs)
emerged
as
a
highly
promising
option,
enabling
strong
resonances
and
precise
control
various
characteristics
waves,
such
phase,
amplitude,
polarization.
This
review
aims
showcase
recent
advancements
CSRR
metasurfaces
for
THz
particularly
focusing
on
both
passive
active
methods
employed
controlling
using
single‐layer
multi‐layer
metasurfaces.
Moreover,
this
will
provide
valuable
insights
into
potential
research
directions
rapidly
evolving
field.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: May 15, 2024
Abstract
In
recent
years,
there
has
been
notable
advancement
in
programmable
metasurfaces,
primarily
attributed
to
their
cost-effectiveness
and
capacity
manipulate
electromagnetic
(EM)
waves.
Nevertheless,
a
significant
limitation
of
numerous
available
metasurfaces
is
capability
influence
wavefronts
only
reflection
mode
or
transmission
mode,
thus
catering
half
the
spatial
coverage.
To
best
our
knowledge
for
first
time,
novel
graphene-assisted
reprogrammable
metasurface
that
offers
unprecedented
independently
concurrently
EM
waves
within
both
half-spaces
introduced
THz
frequency
band.
This
intelligent
achieves
wavefront
control
concurrent
reflection-transmission
all
same
polarization
channel.
The
meta-atom
constructed
with
two
graphene
sections,
enabling
straightforward
modification
wave
behavior
by
adjusting
chemical
potential
distribution
each
segment
via
an
external
electronic
source.
proposed
functionalities
encompass
various
modes,
including
single
dual
beam
simultaneous
beams
mode-direct
transmission,
vice
versa,
steering
mode-dual
simultaneously.
expected
be
due
manipulation
separately
continuously
applications
such
as
imaging
systems,
encryption,
miniaturized
next-generation
wireless
communications.
IEEE photonics journal,
Journal Year:
2023,
Volume and Issue:
15(4), P. 1 - 9
Published: July 7, 2023
In
this
paper,
we
introduced
an
ultra-thin
broadband
single-layer
metasurface
(MS)
comprising
S-shaped
resonator
(SSR)
structure
enclosed
by
a
circular
cover
adhered
on
dielectric
substrate.
The
MS
exhibits
remarkable
capabilities
in
achieving
simultaneous
half-transmission
and
half-reflection
for
polarization
(CP)
conversion,
as
well
full-space
wavefront
manipulation
the
microwave
frequency
range.
Through
simulations
experiments,
demonstrated
that
orthogonal
CP
coefficients
both
transmission
reflection
exceed
0.35
normal
incidence
of
left-handed
polarizations
(LCP)
right-handed
(RCP)
waves
from
6.2GHz
to
15GHz,
with
relative
bandwidth
about
87.1%.
This
results
conversion
efficiency
approximately
22%,
which
approaches
theoretical
limit
(25%)
single
layer
around
8GHz.
Moreover,
utilizing
principle
geometrical
phase
modulation,
desired
full
2π
phase-shift
can
be
achieved
solely
adjusting
orientation
angle
SSR
structure.
Numerical
substantiate
concept
demonstrating
anomalous
refraction,
vortex
beam
generation,
planar
focusing,
showcasing
comprehensive
control
wavefronts
all
spatial
directions.
Our
design
offers
valuable
insights
practical
implementation
various
applications.
Advanced Theory and Simulations,
Journal Year:
2023,
Volume and Issue:
7(1)
Published: Oct. 10, 2023
Abstract
The
non‐rigidity
of
the
nanophotonic
metasail
platform
and
intense
imparted
optical
force
from
terrestrial
laser
source
lead
to
deformations
during
propulsion
stage.
These
must
be
taken
into
consideration
due
their
potential
adverse
impact
on
communication
performance.
Alterations
in
shape
sail
body
result
varying
angles
incidence
polarization
components
observed
by
photonic
unit
cell,
significantly
impacting
intended
Based
this
premise,
paper
proposes
utilizing
a
reflective
all‐dielectric,
low‐power
active
metasurface
that
dynamically
compensates
for
effects
deformation
facilitates
beam‐steering
purposes
among
different
light
sails
interstellar
space.
Configured
as
p‐n
multi‐junction
layers,
constituent
elements
enable
modulation
carrier
concentrations
through
multigate
biasing.
Through
electrostatic
simulations,
it
demonstrates
required
permittivity
can
achieve
wide
phase
span
320°.
Furthermore,
has
investigated
effect
presence
non‐functional
portions
far‐field
radiation
pattern
highlighted
critical
role
tunable
mitigating
its
impact.
obtained
results
hold
great
promise
realizing
successful
downlink
between
such
gram‐scale
nano‐crafts
Earth.
