51 research outputs found
Resonance Patterns in a Stadium-shaped Microcavity
We investigate resonance patterns in a stadium-shaped microcavity around
, where is the refractive index, the vacuum
wavenumber, and the radius of the circular part of the cavity. We find that
the patterns of high resonances can be classified, even though the
classical dynamics of the stadium system is chaotic. The patterns of the high
resonances are consistent with the ray dynamical consideration, and appears
as the stationary lasing modes with low pumping rate in the nonlinear dynamical
model. All resonance patterns are presented in a finite range of .Comment: 8 pages, 9 figure
Scarred Resonances and Steady Probability Distribution in a Chaotic Microcavity
We investigate scarred resonances of a stadium-shaped chaotic microcavity. It
is shown that two components with different chirality of the scarring pattern
are slightly rotated in opposite ways from the underlying unstable periodic
orbit, when the incident angles of the scarring pattern are close to the
critical angle for total internal reflection. In addition, the correspondence
of emission pattern with the scarring pattern disappears when the incident
angles are much larger than the critical angle. The steady probability
distribution gives a consistent explanation about these interesting phenomena
and makes it possible to expect the emission pattern in the latter case.Comment: 4 pages, 5 figure
Directional interacting whispering gallery modes in coupled dielectric microdisks
We study the optical interaction in a coupled dielectric microdisks by
investigating the splitting of resonance positions of interacting whispering
gallery modes (WGMs) and their pattern change, depending on the distance
between the microdisks. It is shown that the interaction between the WGMs with
odd parity about y-axis becomes appreciable at a distance less than a
wavelength and causes directional emissions of the resulting interacting WGMs.
The directionality of the interacting WGMs can be understood in terms of an
effective boundary deformation in ray dynamical analysis. We also discuss about
the oscillation of the splitting when the distance is greater than a
wavelength.Comment: 7 pages, 10 figure
Antioxidant and Anti-Inflammatory Effects of Herbal Formula SC-E3 in Lipopolysaccharide-Stimulated RAW 264.7 Macrophages
SC-E3 is a novel herbal formula composed of five oriental medicinal herbs that are used to treat a wide range of inflammatory diseases in Korean traditional medicine. In this study, we sought to determine the effects of SC-E3 on free radical generation and inflammatory response in lipopolysaccharide- (LPS-) treated RAW 264.7 macrophages and the molecular mechanism involved. The ethanol extract of SC-E3 showed good free radical scavenging activity and inhibited LPS-induced reactive oxygen species generation. SC-E3 significantly inhibited the production of the LPS-induced inflammatory mediators, nitric oxide and prostaglandin E2, by suppressing the expressions of inducible nitric oxide synthase and cyclooxygenase-2, respectively. SC-E3 also prevented the secretion of the proinflammatory cytokines, IL-1β, TNF-α, and IL-6, and inhibited LPS-induced NF-κB activation and the mitogen-activated protein kinase (MAPK) pathway. Furthermore, SC-E3 induced the expression of heme oxygenase-1 (HO-1) by promoting the nuclear translocation and transactivation of Nrf2. Taken together, these results suggest that SC-E3 has potent antioxidant and anti-inflammatory effects and that these effects are due to the inhibitions of NF-κB and MAPK and the induction of Nrf2-mediated HO-1 expression in macrophages. These findings provide scientific evidence supporting the potential use of SC-E3 for the treatment and prevention of various inflammatory diseases
Chaos Synchronization of delayed systems in the presence of delay time modulation
We investigate synchronization in the presence of delay time modulation for
application to communication. We have observed that the robust synchronization
is established by a common delay signal and its threshold is presented using
Lyapunov exponents analysis. The influence of the delay time modulation in
chaotic oscillators is also discussed.Comment: 9 pages, 6 figure
Resonances in a circular dielectric cavity
We study resonance distributions in a circular dielectric cavity. It is shown
that the decay-rate distribution has a peak structure and the details of the
peak are consistent with the classical survival probability time distribution.
We also investigate the behavior of the complex resonance positions at the
small opening limit. At the large limit, the real part of complex resonance
positions approaches the solutions with different of Dirichlet problem with
a scale and the imaginary part goes zero as for TM and
for TE polarization, where is the order of the resonance.Comment: 10 pages, 7 figure
Quasiscarred Resonances in a Spiral-shaped Microcavity and Fresnel Filtering Effects(1)Current topics of quantum chaos in nanosciences, Chaos and Nonlinear Dynamics in Quantum-Mechanical and Macroscopic Systems)
この論文は国立情報学研究所の電子図書館事業により電子化されました。We discuss the quasiscarring phenomenon in a spiral-shaped dielectric microcavity. Unlike the scarred resonances which occur in many different chaotic systems, in the quasiscarred resonance there is no unstable periodic orbit underlying the pattern of localization. We analyze the Presnel filtering effects on the quasiscarred resonances and show that the theoretical expectation explains qualitatively the quasiscarred resonance patterns
Lasing Modes in a Spiral-Shaped Microcavity(1)Current topics of quantum chaos in nanosciences, Chaos and Nonlinear Dynamics in Quantum-Mechanical and Macroscopic Systems)
この論文は国立情報学研究所の電子図書館事業により電子化されました。Lasing modes in a two-dimensional spiral-shaped microcavity are numerically studied in a nonlinear dynamical model, Schrodinger-Bloch model. The stationary lasing mode of the model is analyzed by comparing to the resonances in the corresponding passive cavity. We also investigate the quasiscarring patterns when a selective pumping is applied. We discuss the dynamical behavior of electric field intensity during the transient in the nonlinear dynamical model
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