Metasurfaces
possess
the
ability
to
manipulate
wavefront
of
electromagnetic
waves,
but
majority
them
are
limited
single
transmission
or
reflection
mode
without
altering
their
structure.
To
address
this
limitation,
we
proposed
a
switchable
terahertz
metasurface
for
manipulation.
By
capitalizing
on
phase
transition
properties
vanadium
dioxide
(its
conductivity
changes
with
temperature),
can
work
in
controlled
by
temperature.
Additionally,
designed
8
encoding
elements
achieve
gradient
changing
shape
unit
element.
Finally,
arranged
element
create
and
switching
optical
device
beam
steering
focusing.
IEEE Photonics Technology Letters,
Год журнала:
2023,
Номер
35(5), С. 245 - 248
Опубликована: Янв. 4, 2023
Airy
beams
in
microwave
and
optical
region
have
gained
wide
attention
of
researchers
due
to
their
remarkable
non-diffractive,
self-bending
self-healing
properties.
However,
the
analysis
terahertz
wave
band
is
less.
In
this
letter,
we
proposed
an
beam
multifunctional
metasurface
which
can
achieve
multiple
functions
under
different
polarized
waves.
Under
linearly
waves
incidence,
designed
generate
autofocusing
beam.
Meanwhile,
same
also
realize
diversified
including
focusing,
multi-vortex
beam,
focusing
vortex
circularly
incidence.
Our
presented
structure
has
potential
applications
important
scenarios
such
as
biomedicine,
imaging,
holography,
devices.
IEEE photonics journal,
Год журнала:
2023,
Номер
15(4), С. 1 - 9
Опубликована: Июль 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.
Applied Optics,
Год журнала:
2022,
Номер
61(21), С. 6311 - 6311
Опубликована: Июнь 27, 2022
Three
vortex-focused
beams
are
produced
with
linearly
polarized
light
along
the
x
or
y
axis
at
a
wavelength
of
1550
nm.
First,
polarization-independent
vortex
metalens
topological
charge
three
and
focal
length
3000
nm
is
designed
by
selecting
cylindrical-shaped
elements.
This
design
has
focusing
efficiency
83%.
Second,
different
lengths
charges
achieved
combining
various
shapes
structures.
Both
designs
have
greater
than
92%.
The
metasurface
great
significance
to
optical
communication
radar
detection.
Optics Letters,
Год журнала:
2023,
Номер
48(4), С. 956 - 956
Опубликована: Янв. 10, 2023
Anomalous
reflection
from
metasurfaces
with
100%
efficiency
at
optical
frequencies
was
not
achieved
until
an
all-dielectric
quasi-three-dimensional
subwavelength
structure
proposed.
The
desired
nonlocal
control
of
light
waves
is
realized
by
designing
phase
responses
multilayer
films
a
single
wavelength.
However,
high-efficiency
bandwidth
controllable
only
the
response
Here,
we
propose
use
metasurface
to
achieve
anomalous
customized
bandwidth.
interference
successive
scattered
multiple
wavelengths
controlled
dispersion
regulation
films.
As
proof
concept,
two
sets
different
dispersions
were
designed
realize
broadband
(∼110
nm)
and
narrowband
(∼15
reflections,
both
over
80%.
results
offer
general
strategy
design
arbitrary
might
stimulate
various
potential
applications
for
metadevices.
IEEE Photonics Technology Letters,
Год журнала:
2023,
Номер
35(19), С. 1051 - 1054
Опубликована: Июль 24, 2023
The
simultaneous
control
of
the
spin
and
orbital
angular
momentum
light
beams
has
attracted
considerable
interest
from
researchers.
While
some
reports
have
explored
this
topic
in
microwave
band,
studies
focusing
on
optical
terahertz
band
remain
scarce.
Furthermore,
most
devices
operating
tend
to
larger
profiles
narrower
bandwidths.
This
research
presents
a
folded
transmitarray
that
enables
manipulation
momentum,
beam
deflection
direction
waves.
device
an
overall
profile
approximately
one-third
focal
length
operates
within
relative
bandwidth
18.2%.
proposed
promising
potential
field
high-performance
information
technology.
Metasurfaces
possess
the
ability
to
manipulate
wavefront
of
electromagnetic
waves,
but
majority
them
are
limited
single
transmission
or
reflection
mode
without
altering
their
structure.
To
address
this
limitation,
we
proposed
a
switchable
terahertz
metasurface
for
manipulation.
By
capitalizing
on
phase
transition
properties
vanadium
dioxide
(its
conductivity
changes
with
temperature),
can
work
in
controlled
by
temperature.
Additionally,
designed
8
encoding
elements
achieve
gradient
changing
shape
unit
element.
Finally,
arranged
element
create
and
switching
optical
device
beam
steering
focusing.
