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Type: Artigo de periódico
Title: Stimulated Brillouin scattering from multi-GHz-guided acoustic phonons in nanostructured photonic crystal fibres
Author: Dainese, P
Russell, PSJ
Joly, N
Knight, JC
Wiederhecker, GS
Fragnito, HL
Laude, V
Khelif, A
Abstract: Wavelength-scale periodic microstructuring dramatically alters the optical properties of materials. An example is glass photonic crystal fibre(1) ( PCF), which guides light by means of a lattice of hollow micro/nanochannels running axially along its length. In this letter, we explore stimulated Brillouin scattering in PCFs with subwavelength-scale solid silica glass cores. The large refractive-index difference between air and glass allows much tighter confinement of light than is possible in all-solid single-mode glass optical fibres made using conventional techniques. When the silica-air PCF has a core diameter of around 70% of the vacuum wavelength of the launched laser light, we find that the spontaneous Brillouin signal develops a highly unusual multi-peaked spectrum with Stokes frequency shifts in the 10-GHz range. We attribute these peaks to several families of guided acoustic modes each with different proportions of longitudinal and shear strain, strongly localized to the core(2,3). At the same time, the threshold power for stimulated Brillouin scattering(4) increases fivefold. The results show that Brillouin scattering is strongly affected by nanoscale microstructuring, opening new opportunities for controlling light-sound interactions in optical fibres.
Country: Inglaterra
Editor: Nature Publishing Group
Citation: Nature Physics. Nature Publishing Group, v. 2, n. 6, n. 388, n. 392, 2006.
Rights: fechado
Identifier DOI: 10.1038/nphys315
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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