1,721,126 research outputs found
Guiding and routing light with nematicons RID F-7127-2011
No full textWe review the main properties and applications of Nematicons, spatial solitons in reorientational nematic liquid crystals, with emphasis on waveguiding and processing of optical information
Spectral evolution of an optical pattern in non local nematic liquid crystals RID F-7127-2011
No full textWe experimentally ascertain the role of non locality in the spectral evolution of multifilament patterns generated by modulational instability in nematic liquid crystals. (c) 2005 Optical Society of America
Spatial solitons in nematic liquid crystals RID F-7127-2011
No full textNematic liquid crystals exhibit a saturable nonlinearity, nonlocal in time and in space, owing to light-induced reorientation of the molecular director. In such media, (2 + 1)-dimensional spatial solitons can be obtained at milliwatt-power levels and confine weaker co-polarized signals of different wavelengths, employing either coherent or partially incoherent excitations. Our experimental observations of solitons and related phenomena, ranging from angular steering to mutual interactions, are reviewed. Models are briefly discussed and used to predict and interpret the results
Observation of power-dependent walk-off via modulational instability in nematic liquid crystals RID F-7127-2011
No full textWe investigate power-controlled angular steering of light filaments produced by transverse modulational instability in an anisotropic nematic liquid-crystal cell. (c) 2005 Optical Society of America
Nematicons across interfaces: anomalous refraction and reflection of solitons in liquid crystals RID F-7127-2011
No full textThe robustness of nematicons, i. e. spatial solitons in nematic liquid crystals, can be exploited to implement counter-intuitive negative reflection and refraction schemes for optical signal manipulation at interfaces. (C) 2007 Optical Society of Americ
Routing light at will RID F-7127-2011
No full textWe present a comprehensive review on the routing of self-confined light-beams in liquid crystals, i.e., generation, propagation and angular steering of self-induced waveguides or spatial solitons in a nonlinear non local dielectric with a large electro-optic response. We describe all-optical routing through soliton-soliton or soliton-beam interactions, as well as voltage-controlled steering in an anisotropic geometry via birefringence or refraction/reflection at a graded interface
Nematic Liquid Crystals: a suitable medium for self-confinement of Coherent and Incoherent Light
No full textNonlocal optical propagation in nonlinear nematic liquid crystals RID F-7127-2011
No full textOptical propagation in nematic liquid crystals is characterized by a large and highly-nonlocal Kerr-like nonlinearity. We investigate the fundamental role played by spatial nonlocality in nonlinear optical propagation, and develop a model able to predict the main features of spatial solitons and modulational instability in nematic liquid crystals. The model unifies solitons in physical systems exhibiting different degrees of nonlocality, disclosing a connection between nonlocal solitons and parametric solitons in quadratic media. Finally, soliton breathing as well as other characteristics of nonlocal propagation are experimentally demonstrated in a specifically-engineered liquid crystal cell
Nonlocal spatial soliton interactions in nematic liquid crystals RID F-7127-2011
No full textThe interaction between spatial optical solitons in undoped nematic liquid crystals is governed by reorientational nonlinearity with a significant nonlocality. We demonstrate several cases of interactions, including crossing, interlacing, and merging of spatial solitons in voltage-biased liquid-crystal cells. A scalar model accounts for the main features that were experimentally observed. (C) 2002 Optical Society of America
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