Aluminum nitride nanophotonics for beyond-octave soliton microcomb generation and self-referencing.
Aluminum nitride nanophotonics for beyond-octave soliton microcomb generation and self-referencing.
复制标题
氮化铝奈米光子学于超倍频程孤子微梳产生与自参考。
DOI：
10.1038/s41467-021-25751-9
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发表时间：
2021-09-14
影响因子：
16.6
通讯作者：
Tang HX
中科院分区：
文献类型：
--
作者：
Liu X;Gong Z;Bruch AW;Surya JB;Lu J;Tang HX
频率微梳是锁模激光器和光纤梳的替代品，可用于精密计量、分子指纹和系外行星发现等应用的微型光尺。为了实现频率控制功能，必须通过锁定其载波包络偏移频率来稳定微梳。到目前为止，微梳的稳定性仍然是由芯片外部的精密光学元件复合而成的，从而避免了其缩放效益。为了解决这一挑战，在这里，我们展示了一种基于氮化铝薄膜的纳米光子芯片解决方案，该解决方案同时提供用于生成倍频程孤子梳的光学克尔非线性和用于实现偏移频率的外差检测的二次非线性。结晶氮化铝光子学的敏捷色散控制允许高保真生成孤子，其特征包括1.5倍频程光谱跨度、双色散波和低至220千兆赫的亚太赫兹重复率。这些有吸引力的特性，在片上相位匹配氮化铝波导的帮助下，允许完全确定偏移频率。我们的原理验证演示代表了便携式光学原子钟和频率合成器的完全集成自锁微梳的重要里程碑。虽然倍频程孤子微梳是有吸引力的片上计量和光学时钟，在现有材料的限制导致芯片集成的复杂性增加。在这里，作者报告了使用氮化铝纳米光子芯片获得倍频程孤子微梳和自参考。
Frequency microcombs, alternative to mode-locked laser and fiber combs, enable miniature rulers of light for applications including precision metrology, molecular fingerprinting and exoplanet discoveries. To enable frequency ruling functions, microcombs must be stabilized by locking their carrier-envelope offset frequency. So far, the microcomb stabilization remains compounded by the elaborate optics external to the chip, thus evading its scaling benefit. To address this challenge, here we demonstrate a nanophotonic chip solution based on aluminum nitride thin films, which simultaneously offer optical Kerr nonlinearity for generating octave soliton combs and quadratic nonlinearity for enabling heterodyne detection of the offset frequency. The agile dispersion control of crystalline aluminum nitride photonics permits high-fidelity generation of solitons with features including 1.5-octave spectral span, dual dispersive waves, and sub-terahertz repetition rates down to 220 gigahertz. These attractive characteristics, aided by on-chip phase-matched aluminum nitride waveguides, allow the full determination of the offset frequency. Our proof-of-principle demonstration represents an important milestone towards fully integrated self-locked microcombs for portable optical atomic clocks and frequency synthesizers. Though octave soliton microcombs are attractive for on-chip metrology and optical clocks, limitations in existing materials lead to increased chip integration complexity. Here, the authors report access to octave soliton microcombs and self-referencing using aluminium nitride nanophotonic chips.
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影响因子：
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