APL Materials,
Journal Year:
2024,
Volume and Issue:
12(11)
Published: Nov. 1, 2024
Rare-earth-doped
materials
have
garnered
significant
attention
as
material
platforms
in
emerging
quantum
information
and
integrated
photonic
technologies.
Concurrently,
advances
its
nanofabrication
processes
unleashed
thin
film
lithium
niobate
(LN)
a
leading
force
of
research
these
technologies,
encompassing
many
outstanding
properties
single
material.
Leveraging
the
scalability
ion
implantation
to
integrate
rare-earth
erbium
(Er3+),
which
emits
at
1532
nm,
into
LN
can
enable
plethora
exciting
technologies
operating
telecom
C-band.
Many
rely
on
coupling
via
polarization-sensitive
structures
such
waveguides
optical
nanocavities,
necessitating
fundamental
studies.
Toward
this
goal,
we
conducted
an
extensive
study
role
post-implantation
processing
minimizing
implantation-induced
defectivity
x-cut
insulator.
By
leveraging
this,
demonstrated
cutting-edge
ensemble
linewidth
140
GHz
for
Er
emission
thin-film
77
K.
This
finding
highlights
progress
defects
through
careful
engineering
processing.
To
best
our
knowledge,
measured
higher
temperature
(77
K)
is
narrowest
when
compared
values
reported
bulk-doped
implanted
crystals
liquid
helium
temperatures
(∼3
K),
showcasing
potential
approach
higher-temperature
operation
devices.
Furthermore,
show
that
photoluminescence
(PL)
highly
polarized
perpendicular
c-axis
systematic
combinational
PL
high-resolution
scanning
transmission
electron
microscopy
(HRSTEM)
These
results
indicate
using
emitters
LN,
along
with
their
polarization
characteristics
related
engineering,
presents
opportunity
produce
luminescent
Er-doped
devices
circuits
nanophotonic
applications
wavelengths.
Sensors,
Journal Year:
2025,
Volume and Issue:
25(4), P. 1102 - 1102
Published: Feb. 12, 2025
Mid-infrared
(MIR)
photonic
sensors
are
revolutionizing
optical
sensing
by
enabling
precise
chemical
and
biological
detection
through
the
interrogation
of
molecules'
unique
vibrational
modes.
This
review
explores
core
principles
MIR
photonics,
emphasizing
light-matter
interactions
within
2-20
µm
wavelength
range.
Additionally,
it
examines
innovative
sensor
architectures,
such
as
integrated
platforms
fibers,
that
enhance
sensitivity,
specificity,
device
miniaturization.
The
discussion
extends
to
groundbreaking
applications
in
environmental
monitoring,
medical
diagnostics,
industrial
processes,
security,
highlighting
transformative
impact
these
technologies.
comprehensive
overview
aims
illuminate
current
state-of-the-art
while
inspiring
future
developments
sensing.
Optics Express,
Journal Year:
2025,
Volume and Issue:
33(7), P. 16338 - 16338
Published: March 19, 2025
Thin-film
lithium
niobate
(TFLN)
has
gained
significant
attention
as
a
platform
for
photonic
integrated
circuits
(PICs)
due
to
its
exceptional
properties,
including
high
nonlinear
coefficients
and
strong
electro-optic
response.
However,
efficient
coupling
between
TFLN
chips
optical
fibers
remains
challenge,
with
current
edge
coupler
designs
often
facing
issues
related
fabrication
complexity
alignment
precision.
In
this
paper,
we
propose
high-efficiency,
fabrication-friendly,
alignment-tolerant
bident
based
on
overcome
these
limitations.
The
design
comprises
three
distinct
regions:
the
facet
region,
beam
combining
adiabatic
taper
region.
It
achieves
measured
efficiency
of
better
than
-1.52
dB
per
at
1550
nm,
an
average
ranging
from
-1.85
-1.6
across
C-band,
mode
field
diameter
approximately
4
μm.
Notably,
offers
large
tolerance
±1
This
simplifies
process,
requiring
only
single
overlay
step.
proposed
practical
solution
interface
packaging
in
devices,
enabling
performance
low
process
complexity.
Photonics,
Journal Year:
2025,
Volume and Issue:
12(5), P. 448 - 448
Published: May 5, 2025
The
2
μm
wavelength
is
ideal
for
light
detection
and
ranging
gas
sensing
due
to
its
eye-safe
operation,
strong
molecular
absorption
targeting,
low
atmospheric
scattering—critical
environmental
monitoring
free-space
communications.
existing
systems
rely
on
mechanical
beam
steering,
which
limits
speed
reliability.
Integrated
photonic
solutions
have
not
yet
been
demonstrated
in
this
wavelength.
We
propose
a
focal
plane
array
design
address
these
challenges.
Compared
optical
phased
arrays
requiring
complex
phase
control
each
antenna,
FPAs
simple
switch-based
high
suppression
of
background
noise.
Although
need
an
external
lens
collimation,
they
significantly
reduce
system
complexity.
This
study
introduces
compact,
low-loss
1
×
8
operating
the
range,
employing
cascaded
Mach–Zehnder
interferometer
switch
silicon
nitride
platform.
device
demonstrates
field
view
16.8°,
better
than
17
dB,
excess
loss
−1.4
dB.
integrated
steering
solution
offers
highly
promising,
cost-effective
approach
rapid
switching.
APL Photonics,
Journal Year:
2025,
Volume and Issue:
10(5)
Published: May 1, 2025
Silicon
photonic
integrated
circuits
offer
significant
improvements
in
processing
bandwidth,
power
efficiency,
and
low
latency,
addressing
the
needs
of
future
microwave
communication
systems.
Several
successful
applications
have
been
demonstrated
this
field;
however,
focus
is
now
shifting
toward
integrating
these
into
single
programmable
circuits.
This
approach
not
only
reduces
fabrication
costs
but
also
makes
photonics
more
accessible
for
everyday
use.
paper
presents
a
scalable
silicon-based
signal
processor
with
advanced
functionalities,
including
high-speed
arbitrary
waveform
generation,
tunable
bandwidth
filtering,
ultra-broadband
beamforming.
These
results
highlight
both
scale
performance,
representing
step
forward
large-scale,
high-performance,
multifunctional
