Second harmonic generation of metal nanoparticles under tightly focused illumination
Sun Jing-Wei1, Wang Xiang-Hui1, †, , Chang Sheng-Jiang1, Zeng Ming2, Zhang Na1
       

Near-field distributions of FF under (a)–(c) PW and (d)–(f) tightly focused illuminations, respectively; (g) the corresponding profiles of Ez along the dashed lines in Figs. 4(c) and 4(f).