Title :
Tip-Enhanced Second Harmonic Generation From a Single NaNbO3 Nanocrystal
Author :
Gengxu Chen ; Wu, E. ; Chengjie Ding ; Quanlan Xiao ; Xueting Ci ; Yan Liu ; Youying Rong ; Botao Wu ; Jianrong Qiu ; Heping Zeng
Author_Institution :
State Key Lab. of Precision Spectrosc., East China Normal Univ., Shanghai, China
Abstract :
We demonstrated the enhanced second harmonic generation (SHG) from a single sodium niobate (NaNbO3) nanocrystal by approaching a metal tip on top of it. By scanning a laser-focused NaNbO3 nanocrystal with a gold-coated tip, the mapping of the enhanced SHG from the nanocrystal was obtained. We observed that the SHG of the single NaNbO3 nanocrystal was strongly enhanced with the gold-coated tip on the top of it. And the enhancement factor showed strong dependence on the excitation polarization and the excitation power. An over 12-fold tip enhancement was observed when the excitation power was 12 mW.
Keywords :
gold; nanophotonics; nanostructured materials; optical harmonic generation; sodium compounds; Au; NaNbO3; enhancement factor; excitation polarization; excitation power; gold-coated tip; laser-focused nanocrystal; metal tip; power 12 mW; single sodium niobate nanocrystal; tip-enhanced second harmonic generation; Frequency conversion; Laser excitation; Microscopy; Nanocrystals; Nonlinear optics; Optical imaging; Plasmons; Second harmonic generation (SHG); nanocrystal; polarization dependence; power dependence; single sodium niobate (NaNbO3); single sodium niobate (NaNbO3) nanocrystal; tip enhancement;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2015.2413406
