异质结构微谐振器中色散管理的倍频程光频梳孤子
Dispersion-managed octave soliton microcombs in heterostructured microresonators
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中文总结 AI 辅助
本研究提出异质结构微谐振器宽带色散管理策略，制备氮化硅微谐振器生成低重复频率倍频程孤子光频梳，可应用于光钟等领域。
中文摘要 AI 辅助
控制群速度色散在超快光学中具有基础重要性，尤其对于超连续谱产生和光频梳合成而言。然而，在传统纳米光子平台上，在超宽带宽范围内同时独立调控多个色散系数仍是一项艰巨挑战。本文展示了一种采用异质结构微谐振器实现宽带色散管理的可靠策略，该谐振器由几何结构不同的绝热级联波导构成。通过精心设计局部色散曲线，我们可灵活合成不同阶次的全局有效色散系数，有效拓展了超出传统限制的设计自由度。作为基准演示，我们采用商用代工厂工艺制备了异质结构氮化硅微谐振器，并成功生成了重复频率低至118 GHz的倍频程孤子光频梳。这些光频梳具有可确定性调控的色散波，其工作范围为290-310 THz。这类具备可检测重复频率和载波包络偏移频率的倍频程光频梳，可直接应用于光钟和频率合成器的f-2f自参考。所提出的异质结构架构为生成具有可调控光谱特性的超宽带孤子光频梳建立了通用范式。
英文摘要
Controlling group velocity dispersion is of fundamental importance in ultrafast optics, particularly for supercontinuum generation and optical frequency comb synthesis. However, the simultaneous, independent tailoring of multiple dispersion coefficients over an ultra-broad bandwidth remains a formidable challenge in conventional nanophotonic platforms. Here, we demonstrate a robust strategy for broadband dispersion management using heterostructured microresonators comprised of adiabatically concatenated waveguides with distinct geometries. By meticulously engineering the local dispersion profiles, we can flexibly synthesize the global effective dispersion coefficients of different orders, effectively expanding design degrees of freedom beyond conventional limits. As a benchmarking demonstration, we fabricate heterostructured silicon nitride microresonators using a commercial foundry process and successfully generate octave-spanning soliton microcombs with a repetition rate as low as 118 GHz. These microcombs feature deterministically tunable dispersive waves operating across the 290-310 THz range. Such octave-spanning microcombs with detectable repetition rates and carrier-envelope offset frequencies are readily applicable to f-2f self-referencing in optical clocks and frequency synthesizers. The proposed heterostructured architecture establishes a versatile paradigm for generating ultrawideband soliton microcombs with tailorable spectral profiles.
