Title :
Enhanced Terahertz Emission From ZnSe Nano-Grain Surface
Author :
He, Shan ; Chen, Xiaoshu ; Wu, Xiaojun ; Wang, Gang ; Zhao, Fuli
Author_Institution :
State Key Lab. of Optoelectron. Mater. & Technol., Sun Yat-sen Univ., Guangzhou
fDate :
6/1/2008 12:00:00 AM
Abstract :
ZnSe(111) nano-grain surface is fabricated by the femtosecond laser ablation technology and is applied for terahertz (THz) generation. Compared with bare ZnSe surface, this nano-grain surface can improve THz emission properties. The power of THz radiation from ZnSe nano-grain surface is about twice as large as that from bare surface at optical rectification range. This enhancement can be attributed to the local field enhancement of the ZnSe nano-grain surface. The primary field enhancement mechanism is the macroscopic local-field enhancement which includes both of the lightning-rod effect and the local-plasmon effect.
Keywords :
II-VI semiconductors; laser ablation; nanostructured materials; nanotechnology; submillimetre wave generation; surface plasmons; zinc compounds; ZnSe; ZnSe nanograin surface; enhanced terahertz emission; femtosecond laser ablation; lightning-rod effect; local field enhancement; local-plasmon effect; optical rectification; terahertz generation; Gratings; Laser beams; Laser excitation; Nonlinear optics; Optical pumping; Pump lasers; Stimulated emission; Surface emitting lasers; Ultrafast optics; Zinc compounds; Nano-grain; ZnSe; optical rectification; surface field enhancement; terahertz (THz) emission;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2008.923217
