Xiong Yuzan, Christy Andrew, Li Yi, Sun Rui, Comstock Andrew H, Wu Junming, Lopez Rene, Lei Sidong, Sun Dali, Cahoon James F, Zhang Xufeng, Yang Binbin, Zhang Wei
Opt Express. 2025 Apr 21;33(8):16809-16819. doi: 10.1364/OE.557146.
Improving the photon-magnon coupling strength can be done by tuning the structure of microwave resonators to better interact with the magnon counterpart. Planar resonators accommodating unconventional photon modes beyond the half- and quarter-wavelength designs have been explored due to their optimized mode profiles and potentials for on-chip integration. Here, we designed and fabricated an actively controlled ring resonator supporting the spoof localized surface plasmons (LSPs), and implemented it in the investigation of photon-magnon coupling for hybrid magnonic applications. We demonstrated gain-assisted photon-magnon coupling with the YIG magnon mode under several different sample geometries. The achieved coupling amplification largely benefits from the high quality factor (Q-factor) due to the additional gain provided by a semiconductor amplifier, which effectively increases the Q-factor from a nearly null state (passive resonance) to more than 1000 for a quadrupole LSP mode. Our results suggest an additional control knob for manipulating photon-magnon coupled systems exploiting external controls of gain and loss.
提高光子与磁振子的耦合强度可以通过调整微波谐振器的结构，使其更好地与磁振子相互作用来实现。由于其优化的模式分布和片上集成潜力，人们已经探索了平面谐振器，这些谐振器能够容纳超越半波长和四分之一波长设计的非常规光子模式。在这里，我们设计并制造了一种支持类表面等离激元局域表面等离子体激元（LSPs）的主动控制环形谐振器，并将其应用于混合磁振子应用中的光子 - 磁振子耦合研究。我们在几种不同的样品几何结构下展示了与YIG磁振子模式的增益辅助光子 - 磁振子耦合。所实现的耦合放大很大程度上得益于半导体放大器提供的额外增益所带来的高品质因数（Q因子），这有效地将四极LSP模式的Q因子从几乎为零的状态（无源共振）提高到超过1000。我们的结果表明，利用增益和损耗的外部控制，为操纵光子 - 磁振子耦合系统提供了一个额外的控制旋钮。
