Terahertz-pulse emission through excitation of surface plasmons in metallic nanostructures

被引：0
|
作者：
Welsh, Gregor H. [1 ]
Wynne, Klaas [1 ]
机构：
[1] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland
来源：
ULTRAFAST PHENOMENA IN SEMICONDUCTORS AND NANOSTRUCTURE MATERIALS XII | 2008年 / 6892卷
关键词：
ultrafast; terahertz radiation; surface plasmons; nanostructures;
D O I：
10.1117/12.759115
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The second-order processes of optical rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification relying on the excitation of surface plasmons (SPs) in metallic nanostructures. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the SPs, results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher order in the incident field.
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页数：11
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