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Title: Nonlinear frequency up-conversion via double topological edge modes
Authors: Qian, C 
Choi, KH 
Wu, RPH 
Zhang, Y 
Guo, K 
Fung, KH 
Issue Date: 2018
Publisher: Optical Society of America
Source: Optics express, 2018, v. 26, no. 4, p. 5083-5091 How to cite?
Journal: Optics express 
Abstract: 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.
EISSN: 1094-4087
DOI: 10.1364/OE.26.005083
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