Observation of topological frequency combs

• 成果类型: Article
• 署名作者: Flower, Christopher J.; Jalali Mehrabad, Mahmoud; Xu, Lida; Moille, Gregory; Suarez-Forero, Daniel G.; Orsel, Ogulcan; Bahl, Gaurav; Chembo, Yanne; Srinivasan, Kartik; Mittal, Sunil; Hafezi, Mohammad
• 署名单位: University System of Maryland; University of Maryland College Park; National Institute of Standards & Technology (NIST) - USA; University of Illinois System; University of Illinois Urbana-Champaign; University System of Maryland; University of Maryland College Park; Northeastern University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8350
• DOI: 10.1126/science.ado0053
• 发表日期: 2024-06-21
• 页码: 1356-+
• 关键词: generation; wave

摘要

On-chip generation of optical frequency combs using nonlinear ring resonators has enabled numerous applications of combs that were otherwise limited to mode-locked lasers. Nevertheless, on-chip frequency combs have relied predominantly on single-ring resonators. In this study, we experimentally demonstrate the generation of a novel class of frequency combs, the topological frequency combs, in a two-dimensional lattice of hundreds of ring resonators that hosts fabrication-robust topological edge states with linear dispersion. By pumping these edge states, we demonstrate the generation of a nested frequency comb that shows oscillation of multiple edge state resonances across approximate to 40 longitudinal modes and is spatially confined at the lattice edge. Our results provide an opportunity to explore the interplay between topological physics and nonlinear frequency comb generation in a commercially available nanophotonic platform.