Optical Microresonators Based on Tapered Optical Fibers

基于锥形光纤的光学微谐振器

• 批准号: 5436884
• 负责人: Professor Dr. Arno Rauschenbeutel
• 金额: --
• 依托单位: Institut für Angewandte Physik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5436884?language=en
• 关键词: Optical; Microresonators; Based; Tapered; Fibers

We aim to realize high Q microresonators in structured tapered optical fibers. The resonators have a highly prolate shape. They sustain whispering gallery modes which exhibit, in contrast to the equatorial modes commonly used in silica microsphere resonators, two spatially well separated caustics with a resonantly enhanced field strength. The position of the caustics strongly depends on the number of revolutions the closed optical path corresponding to the resonator mode carries out around the resonator axis. Different modes can therefore be selectively excited by coupling light in and out of the resonator at the respective caustic. This will be accomplished by means of auxiliary tapered optical fibers using frustrated total internal reflection. Moreover, the free spectral range of our so-called "pendulum modes" is significantly smaller than for equatorial whispering gallery modes. Therefore, a tuning of the pendulum modes over one free spectral range can easily be achieved. The advantageous mode geometry of the resonators, in combination with their tunability, opens interesting perspectives for confining and controlling light. As a first application we aim to couple organic molecules to the resonator modes and observe a modification of their fluorescence.

我们的目标是在结构渐变光纤中实现高Q微谐振器。谐振器的形状非常长。它们支持回音廊模式，与二氧化硅微球谐振器中常用的赤道模式相反，两个空间上分离良好的焦散线具有共振增强的场强。焦散的位置强烈地依赖于对应于谐振器模式的闭合光路绕谐振器轴进行的旋转次数。因此，可以通过在相应焦散处耦合进出谐振器的光来选择性地激发不同的模式。这将通过使用受阻全内反射的辅助锥形光纤来实现。此外，我们所谓的“钟摆模式”的自由光谱范围比赤道耳语走廊模式的自由光谱范围小得多。因此，可以很容易地在一个自由光谱范围内实现摆模式的调谐。谐振器的有利模式几何结构，再加上它们的可调性，为限制和控制光开辟了有趣的前景。作为第一个应用，我们的目标是将有机分子耦合到谐振器模式，并观察到它们的荧光变化。