Second harmonic generation of metal nanoparticles under tightly focused illumination
Sun Jing-Wei1, Wang Xiang-Hui1, †, 
, Chang Sheng-Jiang1, Zeng Ming2, Zhang Na1
, Chang Sheng-Jiang1, Zeng Ming2, Zhang Na1 Schematic diagram of SH response from a spherical particle excited by a focused beam.
