Nonlocal Effects on Field Enhancement in Dimer
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Nonlocal effect on the enhancement of the fundamental wave and the second harmonic generation in the metal dimmer structure is mainly studied in this paper. The dielectric model of metals was described by the hydrodynamic model. From the simulation results, it is found that the nonlocal effect weakens the field enhancement obviously. In addition, with the same spacing, the nonlocal effect on the second harmonic generation is more severe than the fundamental one. It can also be observed that with fixed spacing, the spectrum peaks of the fundamental/second harmonic wave shift with the side length of the dimer. These results have certain guiding significance to the design devices.
KeywordsHarmonic generation Nonlinear Nonlocal effect
This study recieved financial support from the National Science Foundation of China (NSFC) (61675171, 61377055, 61308007, 61705046); Research Fund for the Doctoral Program of Higher Education of China (2014AA014402); and China Postdoctoral Scientific Foundation (grant no. 2017M612608). Science and Technology Planning Project of Guangdong Province (2017B020227009).
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