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.
© 2008 IEEE
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