Raman gain induced mode evolution and on-demand coupling control in whispering-gallery-mode microcavities.
Raman gain induced mode evolution and on-demand coupling control in whispering-gallery-mode microcavities.
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DOI：
10.1364/oe.23.029573
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发表时间：
2015-11
期刊：
影响因子：
3.8
通讯作者：
Xu Yang;Ş. Özdemir;B. Peng;H. Yılmaz;F. Lei;Guilu Long;Lan Yang
中科院分区：
文献类型：
--
作者：
Xu Yang;Ş. Özdemir;B. Peng;H. Yılmaz;F. Lei;Guilu Long;Lan Yang
波导耦合光谐振器在光通信、传感、非线性光学、慢/快光和腔QED等广泛应用中发挥着重要作用。在这样的系统中，耦合机制强烈地影响光传输光谱中的共振特征，从而影响应用的性能和结果。因此，控制波导与微谐振器之间的耦合是至关重要的。在这项工作中，我们研究了一种光纤-锥度耦合低语-走廊模式微谐振器系统，该系统的耦合状态传统上是通过机械调节谐振器与光纤锥度之间的距离来控制的。我们提出并通过实验证明，利用拉曼增益可以实现对耦合状态的按需控制，而无需在谐振器系统中进行任何机械运动。特别地，拉曼增益的应用伴随着Q增强。我们还表明，在拉曼增益控制的帮助下，不同耦合状态之间的转换可以影响光传输光谱，从而提供更好的可分辨性和信号放大。这种全光方法也适用于单片集成和封装波导谐振器系统，其耦合状态在制造时是固定的。它提供了一种有效的途径来控制光在波导耦合谐振器系统中传输，而不需要机械地移动单个光学元件。
Waveguide-coupled optical resonators have played an important role in a wide range of applications including optical communication, sensing, nonlinear optics, slow/fast light, and cavity QED. In such a system, the coupling regimes strongly affect the resonance feature in the light transmission spectra, and hence the performance and outcomes of the applications. Therefore it is crucial to control the coupling between the waveguide and the microresonator. In this work, we investigated a fiber-taper coupled whispering-gallery-mode microresonator system, in which the coupling regime is traditionally controlled by adjusting the distance between the resonator and the fiber-taper mechanically. We propose and experimentally demonstrate that by utilizing Raman gain one can achieve on-demand control of the coupling regime without any mechanical movement in the resonator system. Particularly, the application of Raman gain is accompanied by Q enhancement. We also show that with the help of Raman gain control, the transitions between various coupling regimes can affect the light transmission spectra so as to provide better resolvability and signal amplification. This all-optical approach is also suitable for monolithically integrated and packaged waveguide-resonator systems, whose coupling regime is fixed at the time of manufacturing. It provides an effective route to control the light transmission in a waveguide-couple resonator system without mechanically moving individual optical components.