Semiconductor Science and Technology,
Journal Year:
2024,
Volume and Issue:
39(7), P. 075011 - 075011
Published: May 22, 2024
Abstract
In
this
work,
we
reported
two-photon
absorption
(TPA)
measurements
for
aluminum
vacancies
in
Aluminum
nitride
single
crystals.
We
measured
the
linear
transmission
and
identified
defect
levels.
Using
Z-scan
method,
TPA
coefficients
of
transitions
between
levels
from
380
nm
to
735
nm.
The
transition
occurs
Furthermore,
power
dependence
shows
good
fitting,
confirming
mechanism.
These
results
will
be
helpful
design
fabrication
ultra-low
loss
waveguides
integrated
photonics
ultraviolet
spectral
range.
Nanophotonics,
Journal Year:
2024,
Volume and Issue:
13(8), P. 1503 - 1508
Published: Feb. 14, 2024
Abstract
The
linear
electro-optic
effect
offers
a
valuable
means
to
control
light
properties
via
an
external
electric
field.
Lithium
niobate
(LN),
with
its
high
coefficients
and
broad
optical
transparency
ranges,
stands
out
as
prominent
material
for
efficient
modulators.
recent
advent
of
lithium
niobate-on-insulator
(LNOI)
wafers
has
sparked
renewed
interest
in
LN
compact
photonic
devices.
In
this
study,
we
present
modulator
utilizing
thin
film
sandwiched
between
top
bottom
gold
(Au)
electrodes,
forming
Fabry–Pérot
(F–P)
resonator.
This
resonator
exhibits
spectral
resonance
shifts
under
applied
field,
enabling
modulation
reflected
strength.
achieved
2.3
%
amplitude
±10
V
alternating
voltage.
Our
approach
not
only
presents
simpler
fabrication
process
but
also
larger
amplitudes
compared
previously
reported
metasurface
based
results
open
up
new
opportunities
modulators
applications
beam
steering
devices,
dynamic
holograms,
spatial
modulators,
more.
Journal of Physics Photonics,
Journal Year:
2023,
Volume and Issue:
5(4), P. 042501 - 042501
Published: July 18, 2023
Photonics
offer
numerous
functionalities
that
can
be
used
to
realize
astrophotonic
instruments.
The
most
spectacular
example
date
is
the
ESO
Gravity
instrument
at
Very
Large
Telescope
in
Chile.
Integrated
devices
stand
critical
advantages
for
development,
including
extreme
miniaturization,
as
well
integration,
superior
thermal
and
mechanical
stabilization
owing
small
footprint,
high
replicability
offering
cost
savings.
Numerous
technologies
have
been
developed
address
shortcomings
of
conventional
instruments
date,
development
photonic
lanterns,
complex
aperiodic
fiber
Bragg
gratings,
beam
combiners
enable
long
baseline
interferometry,
laser
frequency
combs
precision
spectral
calibration
spectrometers.
Despite
these
successes,
facility
implementation
solutions
astronomical
instrumentation
currently
limited
because
(1)
low
throughputs
from
coupling
fibers,
fibers
chips,
propagation
bend
losses,
device
etc,
(2)
difficulties
with
scaling
large
channel
count
needed
bandwidths
resolutions,
(3)
efficient
integration
photonics
detectors,
name
a
few.
In
this
roadmap,
we
identify
24
areas
need
further
development.
We
outline
challenges
advances
across
those
covering
design
tools,
simulation
capabilities,
fabrication
processes,
entirely
new
components,
hybridization
characterization
devices.
To
astrophotonics
community
will
work
cooperatively
industrial
partners
who
more
advanced
manufacturing
capabilities.
With
described
herein,
multi-functional
realized
leading
novel
observing
capabilities
both
ground
space
platforms.
Applied Physics Letters,
Journal Year:
2024,
Volume and Issue:
124(8)
Published: Feb. 19, 2024
Wurtzite
ferroelectrics
are
an
emerging
material
class
that
expands
the
functionality
and
application
space
of
wide
bandgap
semiconductors.
Promising
physical
properties
binary
wurtzite
semiconductors
include
a
large,
reorientable
spontaneous
polarization,
direct
band
gaps
span
from
infrared
to
ultraviolet,
large
thermal
conductivities
acoustic
wave
velocities,
high
mobility
electron
hole
channels,
low
optical
losses.
The
ability
reverse
polarization
in
ternary
at
room
temperature
enables
memory
analog
type
quasi-phase
matching
devices
boosts
ecosystem
semiconductors,
provided
appropriate
combination
can
be
achieved
for
any
given
application.
In
this
article,
advances
design,
synthesis,
characterization
ferroelectric
materials
discussed.
Highlights
include:
quantitative
observation
reversal
∼135
μC/cm2
charge
Al1−xBxN
via
microscopy,
domain
patterns
poled
down
400
nm
width
scanning
probe
full
retention
after
over
1000
h
200
°C
baking
2×
enhancement
relative
ZnO
nonlinear
response
Zn1−xMgxO.
main
tradeoffs,
challenges,
opportunities
thin
film
deposition,
heterostructure
design
characterization,
device
fabrication
overviewed.
Advances in Optics and Photonics,
Journal Year:
2024,
Volume and Issue:
16(2), P. 347 - 347
Published: March 4, 2024
Photonic
integrated
circuits
with
second-order
(
χ
(2)
)
nonlinearities
are
rapidly
scaling
to
remarkably
low
powers.
At
this
time,
state-of-the-art
devices
achieve
saturated
nonlinear
interactions
thousands
of
photons
when
driven
by
continuous-wave
lasers,
and
further
reductions
in
these
energy
requirements
enabled
the
use
ultrafast
pulses
may
soon
push
optics
into
realm
single-photon
nonlinearities.
This
tutorial
reviews
recent
developments
photonics,
discusses
design
strategies
for
realizing
few-photon
interactions,
presents
a
unified
treatment
quantum
using
framework
that
smoothly
interpolates
from
classical
behaviors
scale.
These
emerging
platforms
fundamentally
differ
typical
realizations
cavity
electrodynamics
due
large
number
coupled
optical
modes.
Classically,
multimode
have
been
well
studied
optics,
famous
examples
including
soliton
formation
supercontinuum
generation.
In
contrast,
systems
exhibit
far
greater
variety
behaviors,
yet
closed-form
solutions
even
sparser
than
their
counterparts.
developing
we
identify
what
carry
over
devices,
intuition
must
be
abandoned,
new
opportunities
exist
at
intersection
optics.
Although
article
focuses
on
establishing
connections
between
nonlinearities,
frameworks
developed
here
general
readily
extended
description
dynamical
processes
based
third-order
(3)
APL Photonics,
Journal Year:
2024,
Volume and Issue:
9(3)
Published: March 1, 2024
The
huge
development
of
micro-/nano-manufacturing
techniques
on
different
materials
has
greatly
expanded
the
possibilities
realizing
on-chip
multifunctional
devices
photonic
integrated
circuits.
In
recent
years,
we
have
witnessed
technological
advancements,
such
as
active
applications
through
hybrid
integration.
this
Perspective,
first
summarize
materials,
integration
technologies,
and
corresponding
coupling
in
give
technique
prospects.
We
also
introduce
significant
advances
technologies
for
applications,
laser
sources,
optical
frequency
combs,
modulators,
our
views
that
are
likely
to
develop
rapidly.
Finally,
discuss
challenges
applications.
Optics Letters,
Journal Year:
2024,
Volume and Issue:
49(3), P. 658 - 658
Published: Jan. 4, 2024
Integrated
optical
modulators
(IOMs)
are
crucial
components
of
on-chip
photonic
circuits.
However,
most
conventional
IOMs
restricted
to
specific
spectral
bands.
Here,
we
leveraged
the
wide
transparency
window
lithium
niobate
in
conjunction
with
two-pulley
coupled
resonator
method.
This
approach
led
development
a
hyperband
electro-optic
(EO)
modulator
that
operates
over
an
expansive
range
from
775
1550
nm
on
single
device.
The
demonstrated
EO
exhibits
half-wave
voltage-length
products
0.25,
0.93,
and
0.68
V·cm
at
wavelengths
1539.50,
969.70,
775.17
nm,
respectively.
Optica,
Journal Year:
2024,
Volume and Issue:
11(8), P. 1050 - 1050
Published: July 11, 2024
Second-harmonic
generation
(SHG)
extensively
employs
periodically
poled
nonlinear
crystals
through
forward
quasi-phase-matching
to
achieve
efficient
frequency
conversion.
As
poling
periods
approach
sub-micrometers,
backward
has
also
been
demonstrated,
albeit
by
utilizing
pulsed
laser
drives.
The
realization
of
symmetric
second-harmonic
generation,
characterized
counterpropagating
pumps,
however,
remained
elusive
despite
theoretical
predictions.
main
challenge
lies
in
achieving
strong
coupling
with
the
period
below
half
wavelength
light.
recent
emergence
high-quality
ferroelectric
lithium
niobate
thin
films
provides
an
opportunity
for
precise
domain
control
at
submicron
dimensions.
In
this
paper,
we
demonstrate
reliable
domains
a
film
waveguide
down
370
nm,
thereby
realizing
highly
continuous-wave
pumped
SHG.
This
demonstration
not
only
validates
feasibility
subwavelength
periodic
on
waveguides
but
could
enable
ferrolectric
structures
be
leveraged
integrated
photonics
and
optics
research.
Advances in Physics X,
Journal Year:
2024,
Volume and Issue:
9(1)
Published: June 9, 2024
In
the
rapidly
evolving
field
of
integrated
photonics,
microwave
photonics
(MWP)
stands
out
as
a
critical
domain
for
on-chip
signal
processing
applications.
Over
past
decade,
harnessing
stimulated
Brillouin
scattering
(SBS)
has
yielded
remarkable
progress
in
this
area
due
to
its
frequency
tunability
and
unique
narrowband
resolution
that
can
be
achieved
small
footprint.
The
present
article
offers
comprehensive
review
recent
research
focused
on
photonic
circuits
guide
light
sound,
with
specific
emphasis
heterogeneous
hybrid
integration
techniques
tailored
applications
photonics.
methodologies
realizing
not
only
enable
seamless
functions
into
complementary
metal-oxide-semiconductor
CMOS-compatible
but
also
facilitate
amalgamation
various
active
passive
functionalities
single
chip.
Our
discussion
encompasses
an
overview
strategies
employed
interactions,
along
examination
associated
challenges
limitations.
Furthermore,
we
delve
both
existing
potential
technology
within
MWP
systems
domain,
underscoring
multifaceted
impact
contemporary
future
technological
landscapes.
Applied Physics Letters,
Journal Year:
2023,
Volume and Issue:
123(10)
Published: Sept. 4, 2023
ScAlN
is
an
emerging
ferroelectric
material
that
possesses
large
bandgap
and
strong
piezoelectricity
holds
great
promises
for
enhanced
χ(2)
nonlinearity.
In
this
study,
we
demonstrate
high-fidelity
domain
switching
periodic
poling
of
Al-polar
thin
film
epitaxially
grown
on
a
c-axis
sapphire
substrate
using
gallium
nitride
as
buffer
layer.
Uniform
with
periods
ranging
from
2
to
0.4
μm
realized.
The
ability
lithographically
control
the
polarization
epitaxial
presents
critical
advance
its
further
exploitation
in
storage
nonlinear
optics
applications.
