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Photonic crystals (PCs) are periodic dielectric structures that severed as anexcellent platform to manipulate light. A conventional way to guide/trap lightvia PCs is to introduce a line or point defect by removing or modifying severalunit cells. Here we show that the light can be effectively guided and trappedin the glided photonic crystal interfaces (GPCIs). The projected band gap ofGPCIs, which depends on the glide parameter, is characterized by a Dirac mass.Interestingly, the GPCIs with zero Dirac mass is a glide-symmetric waveguidefeatured with excellent transmission performance even in the presence of sharpcorners and disorders. Moreover, placing two GPCIs with opposite Dirac masstogether results in a photonic bound state due to the Jackiw-Rebbi theory. Ourwork provides an alternative way towards the design of ultracompact photonicdevices such as GPCIs-induced coupled cavity-waveguide system and waveguidesplitter.

Topological light guiding and trapping via shifted photonic crystal interfaces