By modulating two cavity solitons (CSs) locally, in a driven vertical cavity surface emitting laser above threshold, we forced them to oscillate sinusoidally in time. It is illustrated that the amplitude of modulation of two CSs plays an important role in their synchronization. We show that the oscillations of two CSs can be synchronized only when the interaction of them is highly nonsymmetrical and the difference of the modulation frequencies is at most of the order of 1 GHz.
We employ the properties of metamaterials to tailor the modes of metamaterial-dielectric waveguides operating at optical frequencies. We survey the effects of three-dimensional isotropic metamaterial structural parameters on the refractive index of metamaterials and on the hybrid modes in slab metamaterial-dielectric waveguides. Hybrid modes refer to hybrid ordinary-surface plasmon polariton modes in the waveguide structures. We investigate how robust metamaterials are to fluctuations in their structural parameters; specifically, we examine the effects of Gaussian errors on the metamaterials electromagnetic behavior. Our survey enables us to determine the allowable fluctuation limits and from this to identify appropriate unit-cell structure for further applications of metamaterials in waveguide technologies.
In this work, we focus on Multi Quantum Well (MQW) as a semiconductor structure which is orthogonal to the direction
of the propagation of the radiation inside the microresonator in active configuration. At the first, the existence of optical
patterns in semiconductor microresonators in active configuration demonstrated then, the possibility of controlling these
optical patterns using another light (All Optical Switching) has been studied.
We have recently introduced a novel method to calculate local dispersion relation based on the Finite-Difference Time-domain
and filter diagonalization method, which is suitable for local study of dispersion in optical waveguide, especially
for the cases of non-periodic, curvilinear, and finite waveguides. In this paper, this approach is applied to study the
photonic crystal waveguides at interfaces and double hetero-structure waveguides. We also studied the stretching effect,
which is increasing the lateral distance between neighboring rods along guiding direction on band gap. Hybrid modes at
interface are results of superposition of existing modes in adjacent waveguides. The results present a clear picture of
localization mechanism of cavity modes and the transmission in the double-hetero-structures.
In this paper, stabilization of an unstable state of a pattern forming system or selecting of arbitrary pattern formation is presented using a spatial perturbation method in the far-field configuration. Selection and tracking of unstable rolls, squares, and hexagons are demonstrated by numerical simulations through semiconductor microresonators in passive and far-field configurations.
CSs have been theoretically predicted and recently experimentally
demonstrated in broad area, vertical cavity, driven semiconductor
lasers (VCSELs) slightly below the lasing threshold. Above
threshold, the simple adiabatic elimination of the polarization
variable is not correct, leading to oscillatory instabilities with
a spuriously high critical wave-number. To achieve real insight on
the complete dynamical problem, we study here the complete system
of equations and find regimes where a Hopf instability, typical of
lasers above threshold, affects the lower intensity branch of the
homogeneous steady state, while the higher intensity branch is
unstable due to a Turing instability. Numerical results obtained
by direct integration of the dynamical equations show that
writable/erasable CSs are possible in this regime, sitting on