Ultra-low Brillouin scattering in anti-resonant hollow-core fibers
Ultra-low Brillouin scattering in anti-resonant hollow-core fibers
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DOI：
10.1063/5.0017796
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发表时间：
2020-09
期刊：
影响因子：
5.6
通讯作者：
A. Iyer;Wendao Xu;J. Antonio-Lopez;R. A. Correa;W. Renninger
中科院分区：
文献类型：
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作者：
A. Iyer;Wendao Xu;J. Antonio-Lopez;R. A. Correa;W. Renninger
光纤中的敏感光学实验，包括在通信和量子信息中的应用，受到光从热激发的导声声子散射时产生的噪声的限制。新型光纤，如微结构光纤，提供了对光学和声学波导特性的控制，其可以被设计为减轻光机械噪声。在这里，我们研究了微结构反共振空芯光纤的光学机械特性，并展示了它们作为低噪声光纤平台的前景。通过开发超灵敏光谱技术，发现七毛细管反共振空芯光纤表现出创纪录的低光机械耦合（<10−4 W−1 m−1），与全面的数值计算一致。最大的散射发生在被限制在光纤芯中的空气中的被引导的声学模式。由于与芯中的光学模式的最小重叠，二氧化硅中的声共振散射小一百倍，导致可忽略的去偏振噪声。反共振空芯光纤中最大的光机械相互作用被发现比传统单模光纤中的光机械相互作用弱至少三个（如果抽空的话为五个）数量级，这使得这类光纤成为低噪声应用的有前途的平台，包括量子信息处理和光通信。
Sensitive optical experiments in fiber, including for applications in communications and quantum information, are limited by the noise generated when light scatters from thermally excited guided-acoustic phonons. Novel fibers, such as microstructured fibers, offer control over both optical and acoustic waveguide properties, which can be designed to mitigate optomechanical noise. Here, we investigate the optomechanical properties of microstructured anti-resonant hollow-core fibers and demonstrate their promise as a low-noise fiber platform. By developing an ultra-sensitive spectroscopy technique, a seven capillary anti-resonant hollow-core fiber is found to exhibit record low optomechanical coupling (<10−4 W−1 m−1), in agreement with comprehensive numerical calculations. The largest scattering occurs from a guided acoustic mode in the air confined in the core of the fiber. Acoustic resonances in the silica, due to minimal overlap with the optical mode in the core, scatter a hundred times less, resulting in negligible depolarization noise. The largest optomechanical interactions in anti-resonant hollow-core fibers are found to be at least three (five if evacuated) orders of magnitude weaker than those in conventional single-mode fibers, which makes this class of fibers a promising platform for low noise applications, including quantum information processing and optical communication.