1,721,021 research outputs found
All-optical isolation by directional coupling
No full textA nonlinear phase defect inserted in a coherent coupler can realize an effective all-optical diode. Basic features, design criteria, and suggested implementations are discussed with reference to Kerr-like media. (c) 2008 Optical Society of America
Propagation of optical spatial solitons in finite-size media: interplay between nonlocality and boundary conditions
No full textWe study the propagation of spatial solitons close to the lateral boundaries of self-focusing nonlocal media. Using the Green function approach, we investigate the soliton induced index distribution and resulting trajectories in four cases of physical relevance. (c) 2007 Optical Society of America
Dissipative self-confined optical beams in doped nematic liquid crystals
No full textWe study light localization in nonlinear non-local nematic liquid crystals capable of optical gain. We address the role of optical amplification on nonlinear beam propagation, considering various forms of gain and configurations
Self-Turning Self-Confined Light Beams in Guest-Host Media
No full textWe demonstrate power-dependent steering of self-confined light beams propagating in the nonparaxial regime in a guest-host nonlinear medium. Exploiting the Janossy enhancement in dye-doped liquid crystals with reorientational response, we observe sub-mW spatial soliton self-steering as large as 39 degrees, accompanied by trapping of the light spontaneously emitted by the excited dye. The self-turning is modeled in terms of an effective transverse force stemming from the longitudinal electric field in the tightly confined beams, with good agreement between data and simulations
On beam propagation in anisotropic media: one-dimensional analysis
No full textWe theoretically investigate light beam propagation in (1 + 1)D homogeneous anisotropic uniaxials where ordinary and extraordinary waves are decoupled, accounting for the vectorial character of the electromagnetic field and addressing the nonparaxial limit. (C) 2011 Optical Society of Americ
Nonparaxial solitary waves in anisotropic dielectrics
No full textWe account for the vectorial character of electromagnetic waves in the study of nonlinear self-action and transverse localization in dielectric anisotropic media. With reference to uniaxials, we address spatial solitons propagating in the nonparaxial regime in the presence of an arbitrary degree of nonlocality, going from the standard Kerr response to the highly nonlocal case, unveiling various effects, including transverse profile asymmetry and bending of the trajectory, as well as a weak effective nonlocality even in local media
Nonlinear bouncing of nonlocal spatial solitons at the boundaries RID F-7127-2011
No full textWe investigate, both experimentally and theoretically, the interaction of (2D + 1) spatial solitons with the boundaries of a nonlinear medium in the presence of nonlocality. We demonstrate power-dependent nonlinear repulsion at the boundaries, in quantitative agreement with the model predictions. (c) 2007 Optical S ociety of America
Sub-milliwatt dissipative nematicons and spontaneous light emission in dye-doped nematic liquid crystals
No full textBlue light self-confinement in active dye-doped nematic liquid crystals is reported, demonstrating trapping of the emitted red light in dissipative spatial solitons formed by all-optical reorientation
Nematicons beyond the perturbative regime
No full textWe model spatial solitons in nematic liquid crystals, accounting for nonperturbative excitation and related effects, such as power-dependent self steering. We also address the interplay between nonlocality and saturation typical of a reorientational medium. (C) 2010 Optical Society of Americ
Electro-optic beam steering with nematicons
No full textWe analyze a novel geometry expressly designed to maximize the bias-controlled deflection of self-confined light beams in nematic liquid crystals (NLC). We use a self-confined beam and a dielectric interface defined by external voltages, ranging from total internal reflection (TIR) to refraction depending on the applied bias. The optimization of the deflection angle is achieved by using comb electrodes in a planar cell employing planarly oriented NLC molecules. We predict a maximum deflection of 70 with the standard mixture E7. © 2012 Copyright Taylor and Francis Group, LLC
- …
