Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces

被引：88

作者：

Welsh, Gregor H. ^{[1
]}

Wynne, Klaas ^{[1
]}

机构：

[1] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland

来源：

OPTICS EXPRESS | 2009年 / 17卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

EVANESCENT-WAVE ACCELERATION; OPTICAL RECTIFICATION; CHARGE-TRANSFER; EMISSION; FILMS; FIELD; PHOTOEMISSION; SPECTROSCOPY; MULTIPHOTON; EXCITATION;

D O I：

10.1364/OE.17.002470

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A resonant "incoherent" rectification process is presented relying on the excitation of surface plasmons on a nanostructured metal surface. Excitation of gold and silver films with 800-nm femtosecond laser pulses results in the emission of terahertz radiation with an angle-dependent efficiency and an approximately third-order power dependence. It is shown that the source of this terahertz pulse generation is the surface-plasmon-assisted multiphoton ionization and ponderomotive acceleration in the evanescent field of the surface plasmon. Simple models are used to understand the forces and dynamics near the surface. (C) 2009 Optical Society of America

引用

页码：2470 / 2480

页数：11

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