Classical dielectric waveguides (DWs) offer a single- mode operation over a very broad bandwidth with low propagation loss. The main shortcoming of conventional DWs, especially those comprised of light-weight materi-als with a low dielectric constant, is the poor power con-finement，which causes significant crosstalk and inter-ference between neighboring DWs, thereby hampering their deployment in a densely packed layout for effec-tive system integration and miniaturization.