1,323 research outputs found
Statistical properties of chaotic microcavities in small and large opening cases
We study the crossover behavior of statistical properties of eigenvalues in a
chaotic microcavity with different refractive indices. The level spacing
distributions change from Wigner to Poisson distributions as the refractive
index of a microcavity decreases. We propose a non-hermitian matrix model with
random elements describing the spectral properties of the chaotic microcavity,
which exhibits the crossover behaviors as the opening strength increases.Comment: 22 pages, 6 figure
Quasiattractors in coupled maps and coupled dielectric cavities
We study the origin of attracting phenomena in the ray dynamics of coupled
optical microcavities. To this end we investigate a combined map that is
composed of standard and linear map, and a selection rule that defines when
which map has to be used. We find that this system shows attracting dynamics,
leading exactly to a quasiattractor, due to collapse of phase space. For
coupled dielectric disks, we derive the corresponding mapping based on a ray
model with deterministic selection rule and study the quasiattractor obtained
from it. We also discuss a generalized Poincar\'e surface of section at
dielectric interfaces.Comment: 7 pages, 7 figure
Emergent localized states at the interface of a twofold -symmetric lattice
We consider the role of non-triviality resulting from a non-Hermitian
Hamiltonian that conserves twofold PT-symmetry assembled by interconnections
between a PT-symmetric lattice and its time reversal partner. Twofold
PT-symmetry in the lattice produces additional surface exceptional points that
play the role of new critical points, along with the bulk exceptional point. We
show that there are two distinct regimes possessing symmetry-protected
localized states, of which localization lengths are robust against external
gain and loss. The states are demonstrated by numerical calculation of a
quasi-1D ladder lattice and a 2D bilayered square lattice.Comment: 10 pages, 7 figure
Vertically aligned InGaN nanowires with engineered axial In composition for highly efficient visible light emission.
We report on the fabrication of novel InGaN nanowires (NWs) with improved crystalline quality and high radiative efficiency for applications as nanoscale visible light emitters. Pristine InGaN NWs grown under a uniform In/Ga molar flow ratio (UIF) exhibited multi-peak white-like emission and a high density of dislocation-like defects. A phase separation and broad emission with non-uniform luminescent clusters were also observed for a single UIF NW investigated by spatially resolved cathodoluminescence. Hence, we proposed a simple approach based on engineering the axial In content by increasing the In/Ga molar flow ratio at the end of NW growth. This new approach yielded samples with a high luminescence intensity, a narrow emission spectrum, and enhanced crystalline quality. Using time-resolved photoluminescence spectroscopy, the UIF NWs exhibited a long radiative recombination time (Ï„r) and low internal quantum efficiency (IQE) due to strong exciton localization and carrier trapping in defect states. In contrast, NWs with engineered In content demonstrated three times higher IQE and a much shorter Ï„r due to mitigated In fluctuation and improved crystal quality
Analysis of multiple exceptional points related to three interacting eigenmodes in a non-Hermitian Hamiltonian
We have investigated the exceptional points (EPs) which are degeneracies of a
non-Hermitian Hamiltonian, in the case that three modes are interacting with
each other. Even though the parametric evolution of the modes cannot be
uniquely determined when encircling more than two EPs once, we can recover the
initial configuration of the modes by encircling two EPs three times or three
EPs twice. We confirm our expectation by numerically calculating the modes of
an open quantum system, two dielectric microdisks, and 33 matrix model.Comment: 5 pages, 3 figure
Effect of software version and parameter settings on the marginal and internal adaptation of crowns fabricated with the CAD/CAM system
Objective This study investigated the marginal and internal adaptation of individual dental crowns fabricated using a CAD/CAM system (Sirona’s BlueCam), also evaluating the effect of the software version used, and the specific parameter settings in the adaptation of crowns.Material and Methods Forty digital impressions of a master model previously prepared were acquired using an intraoral scanner and divided into four groups based on the software version and on the spacer settings used. The versions 3.8 and 4.2 of the software were used, and the spacer parameter was set at either 40 μm or 80 μm. The marginal and internal fit of the crowns were measured using the replica technique, which uses a low viscosity silicone material that simulates the thickness of the cement layer. The data were analyzed using a Friedman two-way analysis of variance (ANOVA) and paired t-tests with significance level set at
Boundary integral equation method for resonances in gradient index cavities designed by conformal transformation optics
In the case of two-dimensional gradient index cavities designed by the
conformal transformation optics, we propose a boundary integral equation method
for the calculation of resonant mode functions by employing a fictitious space
which is reciprocally equivalent to the physical space. Using the Green's
function of the interior region of the uniform index cavity in the fictitious
space, resonant mode functions and their far-field distributions in the
physical space can be obtained. As a verification, resonant modes in
lima\c{c}on-shaped transformation cavities were calculated and mode patterns
and far-field intensity distributions were compared with those of the same
modes obtained from the finite element method.Comment: 13 pages, 6 figure
Quantum Localization in Open Chaotic Systems
We study a quasi-Floquet state of a -kicked rotor with absorbing
boundaries focusing on the nature of the dynamical localization in open quantum
systems. The localization lengths of lossy quasi-Floquet states located
near the absorbing boundaries decrease as they approach the boundary while the
corresponding decay rates are dramatically enhanced. We find the
relation and explain it based upon the finite time
diffusion, which can also be applied to a random unitary operator model. We
conjecture that this idea is valid for the system exhibiting both the diffusion
in classical dynamics and the exponential localization in quantum mechanics.Comment: 4 pages, 4 figure
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