基金
This work was financially supported by the National Natural Science Foundation of China (NSFC) (61675169, 61377055 and 11634010), the National Key R&D Program of China (2017YFA0303800), and the Fundamental Research Funds for the Central Universities (3102017zy021, 3102017HQZZ 022).
surface plasmon polaritons
plasmonic tip nanofocusing
metal nanostructures
electromagnetic field enhancement