布里渊散射
布里渊区
光学
波长
材料科学
光子晶体光纤
光散射
散射
纳米尺度
光纤
声子
折射率
光子学
慢光
声波
光电子学
光子晶体
物理
纳米技术
凝聚态物理
作者
Paulo Dainese,P. St. J. Russell,Nicolas Y. Joly,Jonathan C. Knight,Gustavo S. Wiederhecker,H.L. Fragnito,Vincent Laude,Abdelkrim Khelif
出处
期刊:Nature Physics
[Springer Nature]
日期:2006-05-21
卷期号:2 (6): 388-392
被引量:267
摘要
Wavelength-scale periodic microstructuring dramatically alters the optical properties of materials. An example is glass photonic crystal fibre1 (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 core2,3. At the same time, the threshold power for stimulated Brillouin scattering4 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.
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