Ji Yingke, Wang Binbin, Fang Liang, Zhao Qiang, Xiao Fajun, Gan Xuetao
Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China.
Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China.
Materials (Basel). 2021 Nov 30;14(23):7330. doi: 10.3390/ma14237330.
On-chip exciting electric modes in individual plasmonic nanostructures are realized widely; nevertheless, the excitation of their magnetic counterparts is seldom reported. Here, we propose a highly efficient on-chip excitation approach of the magnetic dipole mode of an individual split-ring resonator (SRR) by integrating it onto a photonic crystal nanocavity (PCNC). A high excitation efficiency of up to 58% is realized through the resonant coupling between the modes of the SRR and PCNC. A further fine adjustment of the excited magnetic dipole mode is demonstrated by tuning the relative position and twist angle between the SRR and PCNC. Finally, a structure with a photonic crystal waveguide side-coupled with the hybrid SRR-PCNC is illustrated, which could excite the magnetic dipole mode with an in-plane coupling geometry and potentially facilitate the future device application. Our result may open a way for developing chip-integrated photonic devices employing a magnetic field component in the optical field.
单个等离子体纳米结构中的片上激发电模式已得到广泛实现；然而，其磁模式的激发却鲜有报道。在此，我们提出一种通过将单个裂环谐振器（SRR）集成到光子晶体纳米腔（PCNC）上，实现对其磁偶极模式的高效片上激发方法。通过SRR和PCNC模式之间的共振耦合，实现了高达58%的高激发效率。通过调整SRR与PCNC之间的相对位置和扭转角度，进一步展示了对激发磁偶极模式的精细调节。最后，展示了一种光子晶体波导与混合SRR - PCNC侧面耦合的结构，该结构可以通过面内耦合几何结构激发磁偶极模式，并有可能促进未来的器件应用。我们的结果可能为开发在光场中采用磁场分量的芯片集成光子器件开辟一条道路。
