Winkler Justin M, Grudinin Ivan S, Yu Nan
Opt Express. 2016 Jun 13;24(12):13231-43. doi: 10.1364/OE.24.013231.
We study the quality factor of single-mode optical whispering gallery mode resonators using finite element method simulations, with a particular focus on the photonic belt resonator geometry. We experimentally observe a large difference between the quality factors of TM and TE modes in such resonators. Examining radiative losses, we conclude that the TM fundamental mode of single-mode resonators can have geometry related radiative losses caused by mode hybridization and coupling that limits their achievable quality factor. However, TE modes are free from mode hybridization radiative losses. This leads to much higher achievable Q factors for TE modes, only limited by fabrication and material quality. We experimentally observed photonic belt resonator quality factors on the order of one billion for TE modes, higher than in any other single mode optical resonator of similar dimensions.
我们使用有限元方法模拟研究了单模光学回音壁模式谐振器的品质因数，特别关注光子带谐振器的几何结构。我们通过实验观察到此类谐振器中TM模和TE模的品质因数存在很大差异。通过研究辐射损耗，我们得出结论，单模谐振器的TM基模可能存在与几何结构相关的辐射损耗，这是由模式杂化和耦合引起的，限制了它们可达到的品质因数。然而，TE模不存在模式杂化辐射损耗。这导致TE模可达到的品质因数要高得多，仅受制造工艺和材料质量的限制。我们通过实验观察到，TE模的光子带谐振器品质因数达到了十亿量级，高于任何其他类似尺寸的单模光学谐振器。
