Tunable VO2 metasurface for reflective terahertz linear and circular polarization wavefront manipulation at two frequencies independently
Physica B Condensed Matter,
Год журнала:
2024,
Номер
681, С. 415848 - 415848
Опубликована: Март 15, 2024
Язык: Английский
Dual-band terahertz reflective-mode metasurface for the wavefront manipulation of independent linear and circular polarization waves
Journal of the Optical Society of America B,
Год журнала:
2023,
Номер
41(2), С. 341 - 341
Опубликована: Дек. 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.
Язык: Английский
Broadband metasurface based on metallic stereo split-ring structure for full-space terahertz beam deflection and focusing effect
Materials Today Communications,
Год журнала:
2023,
Номер
37, С. 107523 - 107523
Опубликована: Ноя. 6, 2023
Язык: Английский
Composite control of wavelength and polarization of a metalens based on double-layer geometric phase
Physics Letters A,
Год журнала:
2025,
Номер
unknown, С. 130283 - 130283
Опубликована: Янв. 1, 2025
Язык: Английский
Bidirectional multi-mode multiple vortex beams generator based on terahertz metasurface
Optics Communications,
Год журнала:
2024,
Номер
558, С. 130371 - 130371
Опубликована: Фев. 9, 2024
Язык: Английский
Ultrathin Narrowband and Bidirectional Perfect Metasurface Absorber
Coatings,
Год журнала:
2023,
Номер
13(8), С. 1340 - 1340
Опубликована: Июль 30, 2023
The
conventional
design
approaches
for
achieving
perfect
absorption
of
electromagnetic
(EM)
waves
using
metasurface
absorbers
(MSAs)
are
limited
to
absorbing
in
one
direction
while
reflecting
the
other.
In
this
study,
a
novel
ultrathin
narrowband
MSA
with
bidirectional
properties
has
been
proposed,
based
on
tri-layer
metal
square-circular-square
patch
(SCSP)
structure.
simulation
results
demonstrate
that
proposed
exhibits
remarkable
absorbance
98.1%,
which
is
consistent
experimental
and
theoretical
calculations.
equivalent
constitutive
parameters
were
retrieved,
as
well
simulated
surface
current
power
loss
density
distributions,
reveal
designed
originates
from
fundamental
dipolar
resonance.
Furthermore,
demonstrates
stable
wide-angle
both
transverse
electric
(TE)
magnetic
(TM)
under
various
oblique
incidence
angles.
characteristics
can
be
fine-tuned
by
adjusting
structural
parameters.
Additionally,
boasts
excellent
thickness,
bidirectional,
polarization-insensitive,
properties,
making
it
highly
suitable
range
potential
applications
such
imaging,
detection,
sensing.
Язык: Английский
WITHDRAWN: Cross polarization converter with high transmittance and near unity polarization conversion efficiency for visible light based on bilayer all-dielectric metasurface
Results in Physics,
Год журнала:
2024,
Номер
unknown, С. 107808 - 107808
Опубликована: Июнь 1, 2024
It
is
highly
desired
to
achieve
high
efficiency
polarization
converters
in
visible
wavelength
region
for
ultra-compact
optical
systems
which
have
shown
potential
applications
sensing,
communication
and
imaging.
Due
the
intrinsic
property
of
low
loss,
all
dielectric
metasurfaces
are
more
competitive
candidates
be
utilized
fabrication
than
counterparts
based
on
metals.
In
this
paper,
we
design
a
bilayer
metasurface
converter
composed
Si
double-rod
resonator
placed
top
glass
block
with
polymer
substrate
linearly
polarized
light.
The
proposed
structure
can
convert
light
cross-polarized
efficiently
within
from
542
nm
563
transmission
mode
transmittance
near
unity
conversion
efficiency.
larger
0.8
mentioned
range
maximum
0.86
at
556
ratio
90%
same
99.01%
nm.
underline
physical
mechanisms
analyzed
detail
simulated
distributions
surface
current,
electrical
field
calculated
multipole
decompositions
scattering
power.
Язык: Английский
A broadband vortex beam generation by reflective meta-surface based on metal double-slit resonant ring
Journal of the Optical Society of America B,
Год журнала:
2024,
Номер
41(8), С. 1821 - 1821
Опубликована: Июль 12, 2024
Recently,
the
meta-surface
(MS)
has
emerged
as
a
promising
alternative
method
for
generating
vortex
waves.
At
same
time,
MS
also
faces
problem
of
narrow
bandwidth;
in
order
to
obtain
broad
bandwidth,
unit
cell
structure
becomes
more
and
complex,
which
will
bring
many
inconveniences
preparation
process
devices.
Therefore,
we
want
design
simple
with
multi-frequency
selection.
In
this
paper,
based
on
principle
geometric
phase,
reflective
metal
double-slit
resonant
ring.
We
elaborate
resonance
mechanism
cell.
Under
normal
incidence
circularly
polarized
(CP)
waves,
reflection
coefficient
polarization
was
greater
than
85%.
By
rotating
orientation
angle
resonator
cell,
continuous
2
π
phase
coverage
satisfied
frequency
range
0.52–1.1
THz,
relative
bandwidth
71.6%.
Based
this,
construct
generator
by
using
15×15
array.
The
right-handed
(RCP)
waves
left-handed
(LCP)
wave
are
separately
incident
topological
charges
l
=+1,+2,+3
under
multiple
frequencies.
generated
RCP
=−1,−2,−3
LCP
=+1,+2,+3.
numerical
simulation
results
demonstrate
that
our
designed
MS,
capable
achieving
outcomes,
can
effectively
operate
multi-broadband
mode
produce
wide-band
beam.
addition,
calculate
pattern
purity.
Through
theoretical
analysis
simulation,
prove
generate
broadband
wave.
Язык: Английский