1,721,036 research outputs found
All-optical switching with a nematic coherent mixer
No full textThe Kerr-like (reorientational) response of nematic liquid crystals (NLC) can be exploited in a guided-wave configuration supporting two TM-polarized modes, by which an integrated-optics switch is demonstrated that is able to all-optically route the signal to either of two outputs. Although the switch optimization would require adiabatically tailored input and output Y-junctions to launch the excitation, its geometry is the simplest offering switching/routing with all-optical control at mW powers. Results on the switching speed is presented
On the universal character of the Discrete Nonlinear Schroedinger Equation
No full textWe address the universal applicability of the discrete nonlinear Schrodinger equation. By employing an original but general top-down-bottom-up procedure based on symmetry analysis to the case of optical lattices, we derive the most widely applicable and simplest possible model, revealing that the discrete nonlinear Schrodinger equation is "universally" fit to describe light propagation even in discrete tensorial nonlinear systems and in the presence of nonparaxial and vectorial effects
Suppression of transverse instabilities of dark solitons and their dispersive shock waves
No full textWe investigate the impact of nonlocality, owing to diffusive behavior, on transverse instabilities of a dark
stripe propagating in a defocusing cubic medium. The nonlocal response turns out to have a strongly stabilizing
effect both in the case of a single soliton input and in the regime where dispersive shock waves develop
multisoliton regime. Such conclusions are supported by the linear stability analysis and numerical simulation
of the propagation
All-optical switching in a liquid crystalline waveguide
No full textWe demonstrate an all-optical switch based on mode mixing in a liquid crystalline waveguide defined by an external voltage. Efficient switching and rerouting can be achieved with good contrast at low powers in the whole transparency region. (C) 2005 American Institute of Physics
Mode competitions and dynamical frequency pulling in Mie nanolasers: 3D ab-initio Maxwell-Bloch computations
No full textWe investigate the process of light matter interaction in a spherical Mie nanolaser. We derive a rigorous theory based on a three dimensional vector set of Maxwell-Bloch equations and solve the resulting equations through a parallel Finite-Difference Time-Domain Maxwell-Bloch (FDTD-MB) code. Our results predicts a rich physical scenario, ranging from nontrivial vectorial energy matter interplay in the pre-lasing regime to mode competitions and dynamical frequency pulling phenomena. Application of these effects could favor the realization of largely-tunable, nonlinearly controlled nanolaser devices. (C) 2008 Optical Society of America
Three-dimensional ab initio investigation of light-matter interaction in Mie lasers
No full textWe report on an ab initio investigation of light-matter interactions in a spherical Mie laser. We derive a three-dimensional vector set of Maxwell-Bloch (MB) equations and solve them by the finite-difference time-domain (FDTD) method. Parallel MB-FDTD simulations are employed to study the nonlinear behavior of these nanosized lasers with a varying geometry and different material parameters. The retrieved electromagnetic resonances are consistent with those expected from Mie theory. The lasing regime is characterized by a rich physical scenario, including mode competition and dynamical frequency pulling effects. Application of these dynamics could favor the realization of nonlinearly controlled highly tunable nanolaser devices
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