Numerical analysis of low-RI WGM resonators excited by a periodically arranged multilayer dielectric planar waveguide
Numerical analysis of low-RI WGM resonators excited by a periodically arranged multilayer dielectric planar waveguide
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DOI：
10.1016/j.optcom.2021.127343
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发表时间：
2021-12
影响因子：
2.4
通讯作者：
Meng Zhang;Jiansheng Liu;Jiangtao Cheng
中科院分区：
文献类型：
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作者：
Meng Zhang;Jiansheng Liu;Jiangtao Cheng
在回音壁模（Whispering Gallery Mode，WGM）谐振腔的应用中，特别是低折射率谐振腔，由于缺少合适的匹配波导材料，光激发一直是一个关键问题。布洛赫表面波（Bloch surface wave，BSW）由于其场分布将其大部分模能量延伸到外表面周围以及其易于调节的有效折射率，可以促进实现有效耦合。本文提出、设计并数值分析了一种用于球形WGM谐振器自适应激励的BSW波导平台。模拟结果表明，在BSW激励下，WGM谐振腔的谐振深度（RD）可达98%以上，总品质因数Q值高达3。13× 104，与其固有值Q（5.8× 104）处于同一数量级。此外，由于受其构成材料的限制较少，这种BSW-WGM平台非常坚固，特别适合完全集成的应用。
In the applications of whispering gallery mode (WGM) resonators, especially those with low refractive indices (RIs), optical excitation is always a critical issue due to the lack of suitable and matching waveguide materials. The Bloch surface wave (BSW) can facilitate achieving an effective coupling, resulting from its field distribution extending a large portion of its mode energy around the external surface and its easy adjustment of the effective refractive index. In this paper, a BSW waveguide platform for adaptive excitation of spherical WGM resonators is proposed, designed, and numerically analyzed. The simulation results show that the WGM resonator stimulated by BSW exhibits a resonance depth (RD) as large as∼ 98% and a high total quality factor Q total∼ 3. 13× 10 4 which is in the same order of magnitude as its intrinsic value Q intrinsic of 5.8× 10 4. Moreover, less limited by its constitutive materials, this BSW-WGM platform is robust and especially suitable for fully integrated applications.