基于单晶铋取代钇铁石榴石的高品质因子磁光微盘谐振器
High-Q Magneto-Optical Microdisk Resonators Based on Monocrystalline Bismuth-substituted Yttrium Iron Garnets
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中文总结 AI 辅助
本研究基于单晶铋取代钇铁石榴石制备高Q值磁光微盘谐振器，实现Q=1.52×10^5及非互易响应，为集成非互易光子学和量子接口提供紧凑平台。
中文摘要 AI 辅助
基于多种材料平台的微谐振器通过在紧凑体积内增强光与物质相互作用，推动了集成光子学的发展。将这一策略扩展到磁光（MO）介质对于非互易光子学、磁子学和量子转换极具吸引力，然而基于单晶钇铁石榴石（YIG）的紧凑高Q值谐振器由于纳米加工难度大而一直难以实现。在此，我们展示了基于单晶铋取代YIG（Bi:YIG）的高Q值、小模式体积磁光微盘谐振器。通过键合和减薄制备的低损耗Bi:YIG薄膜，结合优化的氩等离子体刻蚀，实现了亚微米厚、空气悬浮的微盘，支持电信波段回音壁模式，其Q值为1.52×10^5，模式体积V≈200立方波长，Q/V≈760，这代表了集成高Q值YIG磁光腔数量级上的改进。该器件表现出明显的磁场依赖光谱响应，包括互易共振位移和非互易的相向传播模式频率分裂。一个微扰解析模型定量重现了这些响应，并表明有效磁光系数约为体材料值的两倍，提示可能存在由小型化引起的增强效应。这些结果确立了单晶YIG微盘作为紧凑高Q值磁光平台，用于集成隔离器、光机学、微梳和光子-磁子量子接口。
英文摘要
Microresonators based on diverse material platforms have driven the progress of integrated photonics by enhancing light-matter interactions in compact volumes. Extending this strategy to magneto-optical (MO) media is highly attractive for nonreciprocal photonics, magnonics, and quantum transduction, yet compact high-Q resonators based on single-crystalline yttrium iron garnet (YIG) have remained elusive because of the difficulty of its nanofabrication. Here we demonstrate high-Q, small-mode-volume MO microdisk resonators based on monocrystalline Bi-substituted YIG (Bi:YIG). Low-loss Bi:YIG thin films prepared by bonding and thinning, combined with optimized Ar-plasma etching, enable submicron-thick, air-suspended microdisks that support telecom-band whispering-gallery modes with $Q = 1.52\times 10^5$, a mode volume $V \approx 200$ cubic wavelengths, and $Q/V \approx 760$, representing an orders-of-magnitude improvement for integrated high-Q YIG MO cavities. The device exhibits clear magnetic-field-dependent spectral responses, including reciprocal resonance shifts and nonreciprocal frequency splitting of counter-propagating modes. A perturbative analytical model quantitatively reproduces these responses and indicates an effective MO coefficient about twice the bulk value, suggesting a possible miniaturization-induced enhancement. These results establish monocrystalline YIG microdisks as a compact high-Q MO platform for integrated isolators, optomechanics, microcombs, and photon-magnon quantum interfaces.
发表机构
- Keio University（庆应义塾大学）
- University of Tokyo（东京大学）
机构由 AI 辅助整理，请以论文原文为准。
