期刊
NANO LETTERS
卷 19, 期 6, 页码 3838-3845出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01004
关键词
hybrid waveguide; semiconductor nanowire; second harmonic generation; momentum conservation; surface plasmon polariton
类别
资金
- National Key Basic Research Program [2015CB932400]
- National Natural Science Foundation of China [91850207, 11674255, 11674256]
- National Key RAMP
- D Program of China [2017YFA0303504, 2017YFA0205800]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30201000]
Developing highly efficient nanoscale coherent light sources is essential for advances in technological applications such as integrated photonic circuits, bioimaging, and sensing. An on-chip wavelength convertor based on second harmonic generation (SHG) would be a crucial step toward this goal, but the light-conversion efficiency would be low for small device dimensions. Here we demonstrate strongly enhanced SHG with a high conversion efficiency of 4 x 10(-5) W-1 from a hybrid plasmonic waveguide consisting of a CdSe nanowire coupled with a Au film. The strong spatial overlap of the waveguide mode with the nonlinear material and momentum conservation between the incident and reflected modes are the key factors resulting in such high efficiency. The SHG emission angles vary linearly with excitation wavelength, indicating a nonlinear steering of coherent light emission at the subwavelength scale. Our work is promising for the realization of efficient and tunable nonlinear coherent sources and opens new approaches for efficient integrated nonlinear nanophotonic devices.
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