Harnessing the mode mixing in optical fiber-tip cavities
Harnessing the mode mixing in optical fiber-tip cavities
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DOI：
10.1088/1361-6455/aa640a
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发表时间：
2017-04-28
影响因子：
1.6
通讯作者：
Horak, Peter
中科院分区：
文献类型：
--
作者：
Podoliak, Nina;Takahashi, Hiroki;Horak, Peter
本文系统地数值研究了在光纤端部形成高斯形反射镜的法布里-珀罗光学腔。这种腔可以通过激光加工光纤尖端来制造，并且是用于实现量子信息应用所需的原子粒子与光场之间的强耦合的有前途的系统。使用模式混合矩阵法，我们分析了腔的光学本征模和相应的损耗取决于一系列的腔形状参数，如镜的曲率半径，压痕深度和腔长。反射镜的高斯形状导致腔中的光学模式的混合。研究了模式混合效应对原子与腔场耦合的影响以及腔场与单模光纤之间的模式匹配。虽然模式混合与增加的腔损耗相关联，但它也可以导致局部光场的增强。我们证明，在谐振腔的基本模式和第二阶拉盖尔-高斯模式之间的谐振周围，可以在腔中心获得50%的原子腔耦合增强，同时仍然保持低的腔损耗和高的腔-光纤光学耦合。
We present a systematic numerical study of Fabry-Perot optical cavities with Gaussian-shape mirrors formed between tips of optical fibers. Such cavities can be fabricated by laser machining of fiber tips and are promising systems for achieving strong coupling between atomic particles and an optical field as required for quantum information applications. Using a mode mixing matrix method, we analyze the cavity optical eigenmodes and corresponding losses depending on a range of cavity-shape parameters, such as mirror radius of curvature, indentation depth and cavity length. The Gaussian shape of the mirrors causes mixing of optical modes in the cavity. We investigate the effect of the mode mixing on the coherent atom-cavity coupling as well as the mode matching between the cavity and a single-mode optical fiber. While the mode mixing is associated with increased cavity losses, it can also lead to an enhancement of the local optical field. We demonstrate that around the resonance between the fundamental and 2nd order Laguerre-Gaussian modes of the cavity it is possible to obtain 50% enhancement of the atomcavity coupling at the cavity center while still maintaining low cavity losses and high cavity-fiber optical coupling.