高Q接触环形微腔中的“Wiggler”Bloch波超模场
High-Q Contacted Ring Microcavities with Scatterer-Avoiding "Wiggler" Bloch Wave Supermode Fields
摘要：
与波导芯接触的高Q环形谐振器为芯片级光机械、热光学和电光学中的各种应用提供了通用平台。我们提出并证明了一种新的方法来实现方位角周期性接触环形谐振器的多模布洛赫匹配的基础上，支持接触的内部和外部半径边缘的光学Q小退化。相邻的横向空间阶的简并模之间的辐射耦合导致虚频（Q）分裂和散射体避免高Q“摇摆器”超模场。我们实验测量Q值高达258，000的设备中制造的硅器件层上埋氧化物下包层，和高达139，000的设备完全悬浮在空气中使用底切步骤。Wiggler超模是微光子系统的真实模式，它在电学、热学和机械设计方面提供了新的自由度。
英文摘要：
High-Q ring resonators with contacts to the waveguide core provide a versatile platform for various applications in chip-scale optomechanics, thermo- and electro-optics. We propose and demonstrate a novel approach to implement azimuthally periodic contacted ring resonators based on multi-mode Bloch matching that support contacts on both the inner and outer radius edges with small degradation to the optical Q. Radiative coupling between degenerate modes of adjacent transverse spatial order leads to imaginary frequency (Q) splitting and a scatterer avoiding high-Q "wiggler" supermode field. We experimentally measure Q's up to 258,000 in devices fabricated in a silicon device layer on buried oxide undercladding, and up to 139,000 in devices fully suspended in air using an undercut step. Wiggler supermodes are true modes of the microphotonic system that offer new degrees of freedom in electrical, thermal and mechanical design.
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