Physical review. A/Physical review, A,
Journal Year:
2024,
Volume and Issue:
110(6)
Published: Dec. 16, 2024
The
optical
gradient
force
trap
lies
at
the
heart
of
tweezers,
with
applications
in
a
wide
spectrum
sciences.
It
is
conventionally
perceived
that
either
bright
or
dark,
capturing
small
particles
towards
intensity
maxima
minima.
Here,
we
demonstrate
there
may
exist
an
intermediate
trapping
state,
which
refer
to
as
full-gray
trapping,
permit
distinct
equilibrium
positions
where
light
incident
on
each
part
particle
neither
maximized
nor
minimized.
appearance
this
third-type
attributed
excitation
high-order
multipole
resonances,
strongly
couples
nonlocal
inhomogeneity
force,
yielding
unique
force-vector
field
converges
gray
region.
By
expanding
classification
traps
and
generalizing
theory
arbitrary-order
multipoles,
our
findings
underscore
impact
Mie
responses
optomechanics
will
facilitate
development
nanoparticle
cooling,
patterning,
ultrasensitive
sorting.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 21, 2025
Abstract
Optical
tweezers
have
found
extensive
applications
across
the
realms
of
biophysics
and
nanoscience
due
to
its
ability
capture
particles
at
both
micro‐
nanoscales.
Serving
as
nanoscale
force
sensors,
optical
are
capable
measuring
physical
properties
nanoparticles
with
piconewton‐level
precision,
offering
significantly
higher
accuracy
compared
other
measurement
techniques,
particularly
for
biological
samples.
Given
rapid
advancements
in
tweezers,
a
comprehensive
review
their
role
is
imperative.
This
begins
fundamental
interactions
biophysics,
exploring
how
measure
variety
forces,
such
Casimir
force,
van
der
Waals
double‐layer
forces.
Subsequently,
recent
development
application
biomedical
fields
focused
on,
including
studies
cells,
nucleic
acids,
proteins,
quantum
mechanics.
Finally,
detailed
assessment
potential
limitations
utilizing
advanced
tweezer
technologies,
emphasizing
impact
future
applicability
biophotonics,
offered.
Transporting
and
assembling
colloidal
particles
is
key
to
applications
such
as
drug
delivery,
the
fabrication
of
functional
materials,
microrobotics.
As
a
result,
there
intense
effort
in
developing
techniques
for
manipulating
colloids
at
high
spatial
temporal
resolutions,
dynamic,
reconfigurable
manner.
Although
optical
manipulation
provides
precise
particle
control,
its
application
often
limited
by
energy
requirements
intricate
setups.
In
this
study,
we
present
an
opto-chemical-electronic
tweezer
(OCET),
novel
strategy
that
addresses
these
limitations.
The
OCET
system
utilizes
photocatalytic
TiO2/Pt
film
irradiated
with
perpendicular
UV
light.
An
electric
field
then
generated
parallel
boundary
patterned
light,
directed
from
illuminated
region
dark
region.
consequent
electrophoresis
electroosmosis
work
tandem
move
inert
(e.g.,
SiO2
microspheres)
∼1
μm/s
trap
them
few
μm
inside
along
light
pattern.
By
dynamically
modulating
patterns,
achieves
directional
transport
assembly
into
arbitrary
patterns.
holds
promise
optofluidics,
micro/nanorobotics,
biomedical
systems,
setting
stage
further
advancements
technologies.
Advanced Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 5, 2025
Abstract
Manipulation
of
single
cells
or
particles
is
crucial
in
the
biomedical
field.
However,
precisely
and
rapidly
manipulating
without
damaging
them
a
significant
challenge.
In
this
study,
novel
strategy
for
indirect
manipulation
microparticles
that
can
satisfy
these
requirements
via
combination
particle‐induced
dielectrophoretic
forces
(PiDEP)
optoelectronic
tweezers
(OET)
developed.
This
based
primarily
on
principle
experiencing
same
tend
to
repel
each
other,
whereas
those
different
are
attracted
other.
During
manipulation,
Ag‐SiO
2
controlled
by
OET
act
as
intermediaries
other
through
forces.
Thus,
range
be
expanded
two
three
times
its
original
size,
speed
significantly
increased
while
maintaining
precision.
Furthermore,
results
indicate
proposed
method
effectively
reduce
cell
damage
one‐third
caused
traditional
OET.
study
demonstrates
potential
particle‐assisted
single‐cell
offers
an
effective
microparticles.
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 13, 2025
Thermophoresis,
the
movement
of
molecules
and
colloids
under
a
thermal
gradient,
has
been
recently
shown
to
be
effective
for
localized
trapping,
manipulation,
even
printing
colloidal
particles
at
interfaces.
However,
lack
broader
understanding
behavior
various
species
poses
challenge
ongoing
development
thermophoresis
as
tool
patterning
assembly.
In
this
Perspective,
we
discuss
colloids,
highlighting
barriers
predicting
these
complex
systems,
well
recent
approaches
measuring
thermophoretic
behavior.
Further
thermophoresis-based
techniques
is
crucial
unlocking
their
potential
advance
field
optically
driven
assembly,
critical
rapid,
on-demand
fabrication
sensors
devices.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 15, 2024
Precision
colloidal
patterning
holds
great
promise
in
constructing
customizable
micro/nanostructures
and
functional
frameworks,
which
showcases
significant
application
values
across
various
fields,
from
intelligent
manufacturing
to
optoelectronic
integration
biofabrication.
Here,
a
direct
4D
method
via
adaptive
opto-thermal-hydrodynamic
manipulation
polymerization
(AOTHMAP)
with
single-particle
resolution
is
reported.
This
approach
utilizes
single
laser
beam
automatically
transport,
position,
immobilize
particles
through
the
utilization
of
light-induced
hydrodynamic
force,
optical
photothermal
polymerization.
The
AOTHMAP
enables
precise
1D,
2D,
3D
varying
sizes
materials,
facilitating
construction
microstructures
complex
shapes.
Furthermore,
by
harnessing
pH-responsive
properties
hydrogel
adhesives,
further
dynamic
alteration
patterned
structures
shrinkage,
restructuring,
cloaking.
Notably,
also
biological
bio-structures
such
as
bio-micromotors.
offers
simple
efficient
strategy
for
high
versatility
flexibility,
promises
manufacturing,
well
Abstract
Plasmonic
antennas
leveraging
localized
surface
plasmon
resonances
(LSPR)
hold
a
significant
premise
for
efficiently
trapping
nanoscale
particles
at
low
power
levels.
However,
their
effectiveness
is
hindered
by
photothermal
effects
that
arise
with
metallic
nanoparticles,
leading
to
decreased
stability
of
trapped
particles.
To
address
this
limitation,
hybrid
approach
combines
depletion
attraction
and
inherent
in
plasmonic
structures
proposed,
capitalizing
on
thermally
induced
concentration
gradients.
Through
the
thermophoretic
polyethylene
glycol
(PEG)
molecules
around
hotspots,
sharp
gradients
are
created,
enabling
precise
localization
nanoscopic
through
synergistic
effect
diffusiophoretic
forces.
Our
experiments
successfully
demonstrate
ability
trap
dynamically
manipulate
small
extracellular
vesicles
100
nm
polystyrene
beads,
showcasing
platform's
potential
assembly
nanoscale.
Remarkably,
method
maintains
stable
performance
even
laser
.
The
demonstration
showcases
compatibility
platform
bio
species.
This
study
introduces
promising
avenue
efficient
manipulation
particles,
wide‐ranging
implications
nanotechnology,
biophysics,
nanomedicine.
research
opens
new
opportunities
advancing
particle
studies
applications,
ushering
era
techniques.
Journal of Physics D Applied Physics,
Journal Year:
2024,
Volume and Issue:
57(42), P. 425104 - 425104
Published: July 31, 2024
Abstract
Optical
trapping,
a
cutting-edge
methodology,
is
pivotal
for
contactlessly
controlling
and
exploring
microscopic
objects.
However,
it
encounters
formidable
challenges
such
as
multiparticle
flexible
control,
seamless
integration.
Here,
we
employ
polarization-modulated
multi-foci
technique
versatile
nanoparticle
trapping
using
multifunctional
metasurfaces
relying
on
geometric
phase.
Numerical
simulations
demonstrate
the
generation
of
two
focused
spots
with
orthogonal
polarization
distributions
through
our
when
illuminated
linearly
polarized
light,
their
be
interchanged
by
orthogonally
switching
incident
polarizations.
We
extend
this
design
to
an
array
metasurface
tweezers
modulated
polarization,
highlighting
versatility
robustness
approach.
Furthermore,
simultaneous
distinct
focusing
cylindrical
vector
beams
monolayer
metasurface,
showcasing
possess
interchange
ability
distributions.
By
leveraging
Maxwell
stress
tensor,
assess
contributions
longitudinal
transverse
optical
forces
SiO
2
spheres,
validating
diverse
manipulation
behaviors
nanoparticles
proposed
designs.
manipulating
phase
states
Sb
S
3
nanopillars,
binary-switchable
are
facilitated
all
tweezers.
Our
work
underscores
efficacy
polarization-modulation
in
consolidating
multiple
tasks
into
single
device,
paving
way
innovative
lab-on-a-chip
applications
biophysics,
nanotechnology,
photonics.
