ACS Nano,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 19, 2024
The
advent
of
metasurfaces
has
revolutionized
the
design
optical
instruments,
and
recent
advancements
in
fabrication
techniques
are
further
accelerating
their
practical
applications.
However,
conventional
top-down
intricate
nanostructures
proves
to
be
expensive
time-consuming,
posing
challenges
for
large-scale
production.
Here,
we
propose
a
cost-effective
bottom-up
approach
create
nanostructure
arrays
with
arbitrarily
complex
meta-atoms
displaying
single
nanoparticle
lateral
resolution
over
submillimeter
areas,
minimizing
need
advanced
high-cost
nanofabrication
equipment.
By
utilizing
air/water
interface
assembly,
transfer
nanoparticles
onto
templated
polydimethylsiloxane
(PDMS)
irrespective
nanopattern
density,
shape,
or
size.
We
demonstrate
robust
assembly
nanocubes
into
diverse
configurations
generally
unachievable
by
methods,
including
U,
L,
cross,
S,
T,
gammadion,
split-ring
resonators,
Pancharatnam–Berry
designer
functionalities.
also
show
nanocube
epitaxy
at
near
ambient
temperature
transform
continuous
that
can
swiftly
transferred
from
PDMS
various
substrates
via
contact
printing.
Our
potentially
offers
manufacturing
alternative
metal
nanostructuring,
unlocking
possibilities
realm
nanophotonics.
Sensors,
Journal Year:
2024,
Volume and Issue:
24(23), P. 7781 - 7781
Published: Dec. 5, 2024
Single-molecule
fluorescence
spectroscopy
offers
unique
capabilities
for
the
low-concentration
sensing
and
probing
of
molecular
dynmics.
However,
employing
such
a
methodology
versatile
diagnostics
under
point-of-care
demands
device
miniaturization
to
lab-on-a-chip
size.
In
this
study,
we
numerically
design
metalenses
with
high
numerical
aperture
(NA
=
1.1),
which
are
composed
silicon
nitride
nanostructures
deposited
on
waveguide
can
selectively
focus
guided
light
into
an
aqueous
solution
at
two
wavelengths
interest
in
spectral
range
500-780
nm.
Despite
severe
chromatic
focal
shift
lateral
directions
owing
wavelength-dependent
propagation
constant
waveguide,
segmented
on-chip
provide
perfectly
overlapping
volumes
that
meet
requirements
epi-fluorescence
collection.
We
demonstrate
molecule
detection
efficiencies
designed
excitation
emission
ATTO
490LS,
Alexa
555,
APC-Cy7
tandem
fluorophores
sufficient
collect
several
thousand
photons
per
second
modest
rate
constants.
Such
sensitivity
provides
reliable
diffusion
correlation
analysis
single
molecules
chip
extract
their
concentration
properties
nanomolar
range.
Achromatic
open
new
avenues
developing
ultra-compact
sensitive
devices
precision
medicine
environmental
monitoring.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 19, 2024
The
advent
of
metasurfaces
has
revolutionized
the
design
optical
instruments,
and
recent
advancements
in
fabrication
techniques
are
further
accelerating
their
practical
applications.
However,
conventional
top-down
intricate
nanostructures
proves
to
be
expensive
time-consuming,
posing
challenges
for
large-scale
production.
Here,
we
propose
a
cost-effective
bottom-up
approach
create
nanostructure
arrays
with
arbitrarily
complex
meta-atoms
displaying
single
nanoparticle
lateral
resolution
over
submillimeter
areas,
minimizing
need
advanced
high-cost
nanofabrication
equipment.
By
utilizing
air/water
interface
assembly,
transfer
nanoparticles
onto
templated
polydimethylsiloxane
(PDMS)
irrespective
nanopattern
density,
shape,
or
size.
We
demonstrate
robust
assembly
nanocubes
into
diverse
configurations
generally
unachievable
by
methods,
including
U,
L,
cross,
S,
T,
gammadion,
split-ring
resonators,
Pancharatnam–Berry
designer
functionalities.
also
show
nanocube
epitaxy
at
near
ambient
temperature
transform
continuous
that
can
swiftly
transferred
from
PDMS
various
substrates
via
contact
printing.
Our
potentially
offers
manufacturing
alternative
metal
nanostructuring,
unlocking
possibilities
realm
nanophotonics.
