Subwavelength light-guiding optical devices have gained great attention in the photonics community because they provide unique opportunities for miniaturization and functionality of the optical interconnect technology. On the other hand, high-refractive-index dielectric nanoparticles working at their fundamental Mie resonances have recently opened new venues to enhance and control light-matter interactions at the nanoscale while being free from Ohmic losses. Combining the best of both worlds, here we experimentally demonstrate low-loss slow light waveguiding in a chain of coupled silicon Mie resonators at telecommunication wavelengths. This resonant coupling forms waveguide modes with propagation losses comparable to, or even lower than those in a stripe waveguide of the same cross section. Moreover, the nanoparticle waveguide also exhibits slow light behaviour, with group velocities down to 0.03 of the speed of light. These unique properties of coupled silicon Mie resonator waveguides, together with hybrid coupler designs reducing the coupling loss from a bus waveguide, as also shown in this work, may open a path towards their potential applications in integrated photonics for light control in optical and quantum communications or biosensing, to mention some.

中文翻译：

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耦合亚波长硅三重谐振器中的低损耗慢光波导

亚波长导光光学器件已在光子学界引起了广泛关注，因为它们为光学互连技术的小型化和功能化提供了独特的机会。另一方面，在其基本Mie共振下工作的高折射率介电纳米粒子最近开辟了新的场所，以增强和控制纳米级的光-物质相互作用，同时没有欧姆损失。结合两全其美，我们在实验上演示了在电信波长的耦合硅Mie谐振器链中的低损耗慢光波导。这种谐振耦合形成的波导模式具有与相同横截面的条纹波导相当或更低的传播损耗。此外，纳米粒子波导还表现出缓慢的光行为，群速度低至光速的0.03。耦合硅Mie谐振器波导的这些独特性能以及混合耦合器设计减少了总线波导的耦合损耗（如本工作所示），可能会为它们在集成光子学中的潜在应用开辟一条道路，以用于光和量子通信中的光控制还是生物传感