Fundamental Research,
Год журнала:
2024,
Номер
unknown
Опубликована: Март 1, 2024
Lensless
imaging
is
an
innovative
and
swiftly
advancing
technology
at
the
intersection
of
optics,
technology,
computational
science.
It
captures
scene
by
directly
recording
interference
or
diffraction
patterns
light,
subsequently
utilizing
algorithms
to
reconstruct
original
image
from
these
patterns.
upends
traditional
paradigms,
offering
newfound
design
flexibility
capacity
seamlessly
integrate
within
diverse
ecosystems.
This
paper
aims
provide
overview
significant
developments
in
optical
modulation
elements,
sensors,
reconstruction
algorithms.
The
novel
application
scenarios
that
benefit
lensless
are
presented.
opportunities
challenges
associated
with
camera
discussed
for
further
improving
its
performance.
Nanophotonics,
Год журнала:
2024,
Номер
13(17), С. 3059 - 3066
Опубликована: Май 31, 2024
Wide-angle
metalenses
in
the
longwave
infrared
have
shown
great
advantages
over
traditional
refractive
doublets
or
triplets,
due
to
light
weight,
CMOS
compatibility,
and
low
cost.
However,
previous
endeavors
been
plagued
by
challenges
including
a
narrow
waveband,
large
F-number,
distortion,
spherical
aberration.
To
address
these
problems,
this
study
introduces
two
dispersive
metasurfaces,
placed
near
front
focal
plane
upon
rear
of
plano-convex
lens,
correct
optical
aberrations.
Utilizing
methodology,
we
propose
experimentally
demonstrate
an
aberration-corrected
hybrid
metalens
for
thermal
imaging
8-12
μm
featuring
FOV
24°,
F-number
1.2,
diameter
12.2
mm.
The
developed
rigorously
evaluated,
exhibits
Modulation
Transfer
Function
(MTF)
values
exceeding
0.2
at
20
Lp/mm
across
full
FOV,
features
average
transmission
48.7
%,
relative
focusing
efficiencies
up
42.1
polarization
insensitivity
broadband
capacity.
These
results
emphasize
potential
applications
our
system
diverse
fields,
such
as
camera
lenses,
autonomous
driving,
healthcare,
environmental
monitoring.
Advanced Materials,
Год журнала:
2023,
Номер
36(17)
Опубликована: Дек. 3, 2023
Fluid
flow
behavior
is
visualized
through
particle
image
velocimetry
(PIV)
for
understanding
and
studying
experimental
fluid
dynamics.
However,
traditional
PIV
methods
require
multiple
cameras
conventional
lens
systems
acquisition
to
resolve
multi-dimensional
velocity
fields.
In
turn,
it
introduces
complexity
the
entire
system.
Meta-lenses
are
advanced
flat
optical
devices
composed
of
artificial
nanoantenna
arrays.
It
can
manipulate
wavefront
light
with
advantages
ultrathin,
compact,
no
spherical
aberration.
offer
novel
functionalities
promise
replace
imaging
systems.
Here,
a
binocular
meta-lens
technique
proposed,
where
pair
GaN
meta-lenses
fabricated
on
one
substrate
integrated
sensor
form
compact
The
weigh
only
116
mg,
much
lighter
than
commercial
lenses.
3D
field
be
obtained
by
disparity
displacement
information
flow.
measurement
error
vortex-ring
diameter
≈1.25%
experimentally
validates
via
Reynolds-number
(Re)
2000
vortex-ring.
This
work
demonstrates
new
development
trend
rejuvenating
diagnostic
tools
toward
more
easy-to-deploy
technique.
enables
further
miniaturization
low-power
portable,
field-use,
space-constrained
applications.
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(18), С. 7661 - 7668
Опубликована: Март 14, 2024
Hydrogen,
as
a
type
of
sustainable
energy,
has
the
potential
to
facilitate
achievement
carbon
neutrality
by
replacing
fossil
fuels.
Conventional
plasmonic
metal
nanostructures
efficient
photocatalysts
have
been
employed
generate
hot
electrons,
thus
further
facilitating
hydrogen
production.
However,
such
structures
only
contain
single
resonance
mode,
which
restricts
field
enhancement
and
limits
electron
generation
rate.
In
this
work,
we
introduce
novel
integrated-resonant
unit
(IRU)
that
combines
local
nonlocal
modes
can
excite
strong
interaction
between
quasi-bound
state
in
continuum
(quasi-BIC)
regime
for
enhancing
electric
field.
As
result,
achieved
maximum
factor
168.5
at
excitation
wavelength
734
nm
under
period
P
=
750
nm.
Correspondingly,
rate
electrons
exceed
6
×
1019
s–1,
is
2
orders
magnitude
greater
than
structure
without
IRU
property.
This
research
provides
strategic
framework
development
enhance
efficiency
photocatalytic
activity,
pivotal
advancement
clean
energy
realization
decarbonized
future.
Fundamental Research,
Год журнала:
2024,
Номер
unknown
Опубликована: Март 1, 2024
Lensless
imaging
is
an
innovative
and
swiftly
advancing
technology
at
the
intersection
of
optics,
technology,
computational
science.
It
captures
scene
by
directly
recording
interference
or
diffraction
patterns
light,
subsequently
utilizing
algorithms
to
reconstruct
original
image
from
these
patterns.
upends
traditional
paradigms,
offering
newfound
design
flexibility
capacity
seamlessly
integrate
within
diverse
ecosystems.
This
paper
aims
provide
overview
significant
developments
in
optical
modulation
elements,
sensors,
reconstruction
algorithms.
The
novel
application
scenarios
that
benefit
lensless
are
presented.
opportunities
challenges
associated
with
camera
discussed
for
further
improving
its
performance.
