Infrared upconversion detection based on two-dimensional material/silicon tunable metasurface heterostructures for telecommunication
Yuyang Ye,
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Xin Hu,
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Yiwei Li
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et al.
Applied Physics Letters,
Journal Year:
2025,
Volume and Issue:
126(11)
Published: March 1, 2025
We
introduce
a
heterostructure
integrating
two-dimensional
nonlinear
GaSe
film
on
silicon
metasurface
supporting
quasi-bound
states
in
the
continuum
(BIC)
mode,
to
enhance
sum-frequency
generation
(SFG)
process
film,
where
incoming
shortwave
infrared
(SWIR)
photons
are
upconverted
visible
photons.
The
wavelength
selectivity
corresponding
different
configurations
enables
film/silicon
tunable
have
response
range
of
1500–1630
nm,
covering
telecommunication
C
and
L
bands.
spectrum
is
derived
from
dual
resonance
structure,
pump
light
signal
correspond
resonances
structure.
high
quality-factor
brought
by
greatly
improves
density
electromagnetic
field
near
thus
improving
conversion
efficiency
film.
introduced
designed
band,
while
located
that
can
be
directly
detected
detector.
low
noise
level
detector
guarantee
sensitivity
detection
light.
results
indicate
upconversion
attained
peak
detectivity
1.4
×
1012
Jones
at
1555.1
comparable
commercial
broadband
InGaAs
detectors
(Thorlabs).
Language: Английский
Free-space high-Q nanophotonics
Jianbo Yu,
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Wenzhe Yao,
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Min Qiu
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et al.
Light Science & Applications,
Journal Year:
2025,
Volume and Issue:
14(1)
Published: April 27, 2025
Abstract
High-Q
nanophotonic
devices
hold
great
importance
in
both
fundamental
research
and
engineering
applications.
Their
ability
to
provide
high
spectral
resolution
enhanced
light-matter
interactions
makes
them
promising
various
fields
such
as
sensing,
filters,
lasing,
nonlinear
optics,
photodetection,
coherent
thermal
emission,
laser
stealth.
While
Q-factors
large
10
9
have
been
achieved
experimentally
on-chip
microresonators,
these
modes
are
excited
through
near-field
coupling
of
optical
fibers.
Exciting
high-Q
via
free-space
light
presents
a
significant
challenge
primarily
due
the
larger
fabrication
area
more
lossy
channels
associated
with
devices.
This
Review
provides
comprehensive
overview
methods
employed
achieve
modes,
highlights
recent
progress
applications,
discusses
existing
challenges
well
prospects
field
nanophotonics.
Language: Английский
Dynamic Tuning of High-Q quasi-Bound States in the Continuum Driven by Liquid Crystal
YANG Fei,
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ZHANG Binglin,
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SHENG Miaomiao
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et al.
Acta Physica Sinica,
Journal Year:
2025,
Volume and Issue:
74(14), P. 0 - 0
Published: Jan. 1, 2025
Optical
systems
based
on
Bound
States
in
the
Continuum
(BIC)
generally
possess
higher
Quality
Factors
(<i>Q</i>)
and
narrower
operational
linewidths
compared
with
traditional
photonic
crystals
or
metasurfaces.
The
<i>Q</i>
values
offer
extensive
possibilities
for
high-performance
optoelectronic
devices.
However,
often
pose
challenges
practical
applications,
as
fabrication
errors
during
production
inevitably
lead
to
discrepancies
between
real
optical
devices
their
ideal
designs,
which
resulting
mismatches
actual
operating
wavelengths.
To
address
this
issue,
we
explore
dynamic
tuning
effect
of
liquid
crystal
(LC)
quasi-Bound
(q-BIC),
aiming
compensate
wavelength
shifts
caused
by
errors.
A
slab
cross-shaped
holes
serves
platform
generating
q-BIC.
Compared
modulation
induced
tilt
angles
incident
light
q-BIC,
LC
has
a
lesser
impact
system's
factor
when
shifting
same
wavelength.
For
instance,
shift
central
<i>λ<sub>0</sub>
</i>of
q-BIC
5.32
nm
using
tilted
angle
results
reduction
up
75.84%
(from
3809.05
920.28).
Whereas
<i>λ<sub>0</sub></i>by
5.63
through
<i>θ</i>
leads
an
increase
14.27%
4352.65).
This
demonstrates
significant
potential
high-<i>Q</i>
ultra-narrowband
Finally,
mechanism
within
system
is
discussed.
smaller
attributed
its
minimal
disruption
symmetry.
Although
also
affects
symmetry
holes,
after
adjusting
asymmetry
parameters
system,
process
can
be
well
matched.
our
research
provides
valuable
references
related
Language: Английский
Electrically Tuning Quasi‐Bound States in the Continuum with Hybrid Graphene‐Silicon Metasurfaces
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 23, 2024
Abstract
Metasurfaces
have
become
one
of
the
most
prominent
research
topics
in
field
optics
owing
to
their
unprecedented
properties
and
novel
applications
on
an
ultrathin
platform.
By
combining
graphene
with
metasurfaces,
electrical
tunable
functions
can
be
achieved
fast
tuning
speed,
large
modulation
depth,
broad
range.
However,
efficiency
hybrid
metasurfaces
within
short‐wavelength
infrared
(SWIR)
spectrum
is
typically
low
because
small
resonance
wavelength
shift
this
In
work,
through
integration
silicon
that
support
quasi‐bound
states
continuum
(quasi‐BIC),
critical
coupling
as
well
transmittance
experimentally
demonstrated.
The
substantial
even
less
than
30
nm
thanks
high
quality
factor
quasi‐BIC
metasurfaces.
measured
using
Fourier
transform
spectroscopy
(FTIR)
a
modified
reflective
lens
improve
accuracy,
realized
utilizing
“cut‐and‐stick”
method
ion
gel.
At
3.0
µm,
change
(Δ
T
=
max
−
min
)
depth
/
reach
22.2%
28.9%,
respectively,
under
bias
voltage
ranging
from
−2
+2
V.
This
work
demonstrates
effective
way
SWIR
spectrum,
which
has
potential
optical
modulation,
reconfigurable
photonic
devices,
communications.
Language: Английский