AI 中文总结
本研究开发YIG-绝缘体平台与高精度纳米图案化技术，制备出基于单晶铋掺杂YIG的光子晶体缺陷纳米腔，实现1500 nm波长附近的高Q因子，为光-磁相互作用及小型化非互易光子器件提供了新平台。
AI 中文摘要
单晶钇铁石榴石（YIG）是磁光学和量子磁振学的关键材料，因其具有高光学透明度、室温下的大磁光（MO）效应以及超长自旋相干时间。虽然在微波区域已展示出丰富的磁光现象，但由于难以制备高质量的YIG纳米结构，将这些概念扩展到技术上重要的电信波长仍具有挑战性。在此，我们通过开发YIG-绝缘体平台和高精度YIG纳米图案化技术，展示了基于单晶铋掺杂YIG的光子晶体（PhC）缺陷纳米腔。制备的纳米腔在波长λ=1500 nm附近表现出腔共振，品质因数Q高达1800，模式体积V为1.1(λ/n)³，对应的Q/V约为10³。测得的Q因子主要受用于面外光耦合的有意引入的晶格调制控制，这表明进一步优化腔几何结构和测量配置可使实验Q因子提升一个数量级。基于YIG的PhC纳米腔为光学区域中强受限的光-磁相互作用提供了平台，为小型化非互易光子器件和增强的光子-磁振耦合开辟了途径。
英文摘要
Monocrystalline yttrium iron garnet (YIG) is a key material for magneto optics and quantum magnonics owing to its high optical transparency, large magneto-optical (MO) effects at room temperature, and exceptionally-long spin coherence. While rich MO phenomena have been demonstrated in the microwave regime, extending these concepts to technologically important telecommunication wavelengths remains challenging due to the difficulty of fabricating high-quality YIG nanostructures. Here, we demonstrate photonic crystal (PhC) defect nanocavities based on monocrystalline Bi-substitudted YIG by developing a YIG-on-insulator platform and high-precision YIG nanopatterning. The fabricated nanocavities exhibit cavity resonances around lambda = 1500 nm with Q factors up to 1,800 and a mode volume V of 1.1(lambda/n)^3, corresponding to Q/V reaching around 10^3. The measured Q factor is primarily governed by intentionally introduced lattice modulations for out-of-plane light coupling, suggesting that further optimization of the cavity geometry and measurement configuration could yield an order-of-magnitude improvement of the experimental Q factor. YIG-based PhC nanocavities provide a platform for strongly confined light-magnetism interactions in the optical regime, opening pathways toward downsized nonreciprocal photonic devices and enhanced photon-magnon coupling.
Comments16 pages, 4 figures
