Bending reorientational solitons with modulated alignment
| Autor: | Antonmaria A. Minzoni, Filip A. Sala, Noel F. Smyth, Urszula A. Laudyn, Miroslaw A. Karpierz, Gaetano Assanto |
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| Přispěvatelé: | Sala, F., Smyth, N. F., Laudyn, U., Karpierz, M., Minzoni, A. A., Assanto, G. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Nonlinear photonics
solitons liquid crystals signal processing Physics Kerr effect Condensed matter physics business.industry Physics::Optics Statistical and Nonlinear Physics Soliton (optics) Polarization (waves) 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics Liquid crystal 0103 physical sciences Transverse orientation Light beam 010306 general physics business Refractive index Nematicon |
| Zdroj: | Sala, F A, Smyth, N, Laudyn, U A, Karpierz, M A, Minzoni, A A & Assanto, G 2017, ' Bending reorientational solitons with modulated alignment ', Journal of the Optical Society of America B, vol. 34, no. 12, pp. 2459-2466 . https://doi.org/10.1364/JOSAB.34.002459 |
| DOI: | 10.1364/JOSAB.34.002459 |
| Popis: | While curved waveguides are fundamental elements in photonics, those induced all-optically in nonlinear uniform dielectrics tend to be straight. In uniaxial soft matter with a reorientational response, such as nematic liquid crystals, light beams in the extraordinary polarization undergo self-focusing via an increase in refractive index and eventually form spatial solitons, i.e., self-induced waveguides. Hereby we investigate the bending of such waveguides by analyzing the trajectory of solitons in nematic liquid crystals— nematicons— in the presence of a linearly varying transverse orientation of the optic axis. Tothis extent we use and compare two approaches: i) a slowly varying (adiabatic) approximation based on momentum conservation of the nematicon in a Hamiltonian sense; ii) the Frank-Oseen elastic theory coupled with a fully vectorial and nonlinear beam propagation method. The models provide comparable results in such a non-homogeneously oriented uniaxial medium and predict bent soliton paths with either monotonic or non-monotonic curvatures, enabling the design of curved channel waveguides induced by light beams. |
| Databáze: | OpenAIRE |
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