Field enhancement within an optical fibre with a subwavelength air core
Field enhancement within an optical fibre with a subwavelength air core
复制标题
DOI：
10.1038/nphoton.2006.81
复制
发表时间：
2007-02
期刊：
影响因子：
35
通讯作者：
G. Wiederhecker;C. Cordeiro;F. Couny;F. Benabid;S. Maier;J. Knight;C. Cruz;H. Fragnito
中科院分区：
文献类型：
--
作者：
G. Wiederhecker;C. Cordeiro;F. Couny;F. Benabid;S. Maier;J. Knight;C. Cruz;H. Fragnito
严格限制的光可以实现从非线性光管理到原子操纵的各种应用。光子晶体光纤（PCF）可以在非常小的纤芯中提供强有力的引导，同时提供长的相互作用长度。然而，波导中的光限制通常最终受到衍射的限制，衍射倾向于使光远离波导芯传播，尽管波导芯具有较高的折射率。最近的研究表明，这种扩展场可以被强引导绝缘体上硅（SOI）波导内的纳米尺度缝隙捕获。在这封信中，我们证明了一个亚波长尺度的空气孔运行的长度的PCF核心内的光能的浓度。核心类似于一个亚微米直径的管，内径为200 nm或更小。空气孔中的高强度，加上长的相互作用长度，有望在光-物质相互作用和非线性光纤光学的新一类实验。
Tightly confined light enables a variety of applications ranging from nonlinear light management to atomic manipulation. Photonic-crystal fibres (PCFs) can provide strong guidance in very small cores while simultaneously offering long interaction lengths. However, light confinement in waveguides is usually ultimately limited by diffraction,, which tends to spread light away from the waveguiding core, despite its higher refractive index. It was recently demonstrated that such spreading fields can be trapped by a nanometre-scale slot inside a strongly guiding silicon-on-insulator (SOI) waveguide,. In this letter we demonstrate the concentration of optical energy within a subwavelength-scale air hole running down the length of a PCF core. The core resembles a submicrometre-diameter tube with a bore diameter of 200 nm or less. The high intensity in an air hole, coupled with long interaction lengths, promises a new class of experiments in light–matter interaction and nonlinear fibre optics.