A waveguide structure capable of aggressive bends (r_(0) -> 0) and long-range propagation (approx1.2 dB/mm) is described here. The structure uses a step-index slab to create the vertical confinement and a pair of metallic parallel plates on either side of the core for lateral confinement. The parallel plates are dimensioned to ensure that all modes that would cause radiation loss in a bend are cut off.
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机译：在此描述了一种能够进行剧烈弯曲（r_（0）-> 0）和远距离传播（约1.2 dB / mm）的波导结构。该结构使用阶跃折射率板来创建垂直约束，并在芯体的两侧使用一对金属平行板进行横向约束。平行板的尺寸确定为确保将所有会导致折弯中的辐射损失的模式都切除。
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