Nonlinear frequency up-conversion via double topological edge modes

Cheng Qian, Ka Hei Choi, Raymond P.H. Wu, Yongliang Zhang, Kai Guo, Kin Hung Fung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)


We study the nonlinear frequency up-conversion in a plasmonic thin film sandwiched between one-dimensional photonic crystals (PCs) of different Zak phases by rigorous numerical time-domain nonlinear hydrodynamic calculations. We show that the proposed hetero-structure can support robust fundamental and high-order topological edge modes that simultaneously enhance the third-harmonic generation. Numerical simulations also show that femtosecond pulses can excite double topological edge modes through optical tunneling in band gaps, leading to a large nonlinear response. The obtained third harmonic generation (THG) conversion efficiency of the hetero-structure is three orders of magnitude larger than that of a single plasmonic film. The results presented here may open new avenues for designing high-efficiency nonlinear photonic devices.
Original languageEnglish
Pages (from-to)5083-5091
Number of pages9
JournalOptics Express
Issue number4
Publication statusPublished - 19 Feb 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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