Physical Chemistry Chemical Physics,
Journal Year:
2023,
Volume and Issue:
25(42), P. 29061 - 29069
Published: Jan. 1, 2023
The
terahertz
perfect
absorber
can
be
applied
in
the
control,
sensing
and
modulation
of
optical
fields
micro-
nanostructures.
However,
they
are
only
single
function,
complex
device
structure
low
sensitivity.
Based
on
this,
by
introducing
bound
state
continuum
(BIC)
with
infinite
quality
factor
field
enhancement
effect,
taking
advantage
phase
transition
characteristics
vanadium
dioxide
(VO2),
we
designed
a
which
actively
switch
between
ultra-wideband
ultra-narrowband.
absorption
mechanism
is
explained
multipole
analysis
theory,
impedance
matching
theory
electromagnetic
distribution.
broadband
mainly
due
to
electric
dipole
resonance
metallic
VO2
materials,
more
than
99%
across
3.64-6.96
THz,
it
has
excellent
such
as
robustness.
Ultra-narrowband
greater
2200
implementation
symmetrically
protected
BIC
sensitivity
2.575
THz
per
RIU.
Therefore,
this
research
could
widely
used
integrated
circuits,
optoelectronic
perceptual
energy,
well
providing
additional
design
ideas
for
multifunctional
devices.
Communications in Theoretical Physics,
Journal Year:
2024,
Volume and Issue:
76(6), P. 065701 - 065701
Published: April 7, 2024
Abstract
This
study
introduces
an
innovative
dual-tunable
absorption
film
with
the
capability
to
switch
between
ultra-wideband
and
narrowband
absorption.
By
manipulating
temperature,
can
achieve
multi-band
within
30–45
THz
range
or
spanning
30–130
THz,
rate
exceeding
0.9.
Furthermore,
structural
parameters
of
are
optimized
using
particle
swarm
optimization
(PSO)
algorithm
ensure
optimal
response.
The
response
is
primarily
attributed
coupling
guided-mode
resonance
local
surface
plasmon
effects.
film’s
symmetric
structure
enables
polarization
incoherence
allows
for
tuning
through
various
means
such
as
doping/voltage,
temperature
parameters.
In
case
a
response,
exhibits
good
sensitivity
refractive
index
changes
in
multiple
modes.
Additionally,
spectrum
remains
effective
even
at
large
incidence
angles,
making
it
highly
promising
applications
fields
biosensing
infrared
stealth.
