In previously reported researches on bound state in the continuum (BIC) waveguides, almost all of them are demonstrated with top-down fabrication procedures, leading to inconvenience for post-manipulation and size tuning. Nanofibers with circular cross sections are the fundamental components to transport energy due to their intrinsic advantages of high flexibility and adjustability, which is replaceable and can be readily manipulated over size and position on the substrate. In this work, we explore the possibility of achieving on-chip integration of silica nanofiber onto a silicon-on-insulator platform. By constructing additional leakage channels in coupled nanofiber waveguides, coherently destructive interferences are successfully achieved. The heavy leakage losses from the low-index nanofiber to a high-index silicon substrate are completely eliminated with BIC, and the propagation length of the nanofiber waveguide is significantly improved.

中文翻译：

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圆形波导连续体中的束缚态：面向硅平台上纳米纤维的片上集成

在之前报道的连续介质（BIC）波导束缚态研究中，几乎所有的研究都是通过自上而下的制造过程来演示的，这导致了后期操作和尺寸调整的不便。具有圆形横截面的纳米纤维是传输能量的基本组件，因为它们具有高灵活性和可调节性的固有优势，可以更换，并且可以轻松地在基板上控制尺寸和位置。在这项工作中，我们探索了将二氧化硅纳米纤维片上集成到绝缘体上硅平台上的可能性。通过在耦合纳米纤维波导中构建额外的泄漏通道，成功实现了相干相消干涉。 BIC完全消除了从低折射率纳米纤维到高折射率硅衬底的严重泄漏损耗，并且纳米纤维波导的传播长度显着提高。