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Enhanced Terahertz Emission From ZnSe Nano-Grain Surface

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5 Author(s)
He, Shan ; State Key Lab. of Optoelectron. Mater. & Technol., Sun Yat-sen Univ., Guangzhou ; Chen, Xiaoshu ; Xiaojun Wu ; Wang, Gang
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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.

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Lightwave Technology, Journal of  (Volume:26 ,  Issue: 11 )