Murendranath Patil Chirag, Arregui Guillermo, Mechlenborg Morten, Zhou Xiaoyan, Alaeian Hadiseh, David García Pedro, Stobbe Søren
Opt Express. 2022 Apr 11;30(8):12565-12575. doi: 10.1364/OE.449221.
We report optical transmission measurements on suspended silicon photonic-crystal waveguides, where one side of the photonic lattice is shifted by half a period along the waveguide axis. The combination of this glide symmetry and slow light leads to a strongly enhanced chiral light-matter interaction but the interplay between slow light and backscattering has not been investigated experimentally in such waveguides. We build photonic-crystal resonators consisting of glide-symmetric waveguides terminated by reflectors and use transmission measurements as well as evanescent coupling to map out the dispersion relation. We find excellent agreement with theory and measure group indices exceeding 90, implying significant potential for applications in slow-light devices and chiral quantum optics. By measuring resonators of different length, we assess the role of backscattering induced by fabrication imperfections and its intimate connection to the group index.
我们报告了对悬浮硅光子晶体波导的光传输测量结果，其中光子晶格的一侧沿波导轴移动了半个周期。这种滑移对称性和慢光的结合导致了强烈增强的手性光与物质相互作用，但慢光与背散射之间的相互作用在这类波导中尚未进行实验研究。我们构建了由反射器终止的具有滑移对称波导的光子晶体谐振器，并使用传输测量以及倏逝耦合来绘制色散关系图。我们发现与理论结果非常吻合，并且测量得到的群折射率超过90，这意味着在慢光器件和手性量子光学应用中具有巨大潜力。通过测量不同长度的谐振器，我们评估了由制造缺陷引起的背散射的作用及其与群折射率的紧密联系。
