Simultaneous multi-frequency topological edge modes between one-dimensional photonic crystals

Ka Hei Choi, C. W. Ling, K. F. Lee, Yuen Hong Tsang, Kin Hung Fung (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

44 Citations (Scopus)


We show theoretically that, in the limit of weak dispersion, one-dimensional binary centrosymmetric photonic crystals can support topological edge modes in all photonic bandgaps. By analyzing their bulk band topology, these "harmonic" topological edge modes can be designed in a way that they exist at all photonic bandgaps opened at the center of the Brillouin zone, at all gaps opened at the zone boundaries, or both. The results may suggest a new approach to achieve robust multi-frequency coupled modes for applications in nonlinear photonics, such as frequency upconversion.
Original languageEnglish
Pages (from-to)1644-1647
Number of pages4
JournalOptics Letters
Issue number7
Publication statusPublished - 1 Apr 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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