Enhancement of ultrafast electron photoemission from metallic nanoantennas excited by a femtosecond laser pulse

被引：29

作者：

Gubko, Mikhail A. ^{[1
]}

Husinsky, Wolfang ^{[2
]}

Ionin, Andrey A. ^{[1
]}

Kudryashov, Sergey I. ^{[1
]}

Makarov, Sergey V. ^{[1
]}

Nathala, Chandrasekher R. ^{[2
]}

Rudenko, Andrey A. ^{[1
]}

Seleznev, Leonid V. ^{[1
]}

Sinitsyn, Dmitry V. ^{[1
]}

Treshin, Ilya V. ^{[1
]}

机构：

[1] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia

[2] Vienna Univ Technol, A-1040 Vienna, Austria

来源：

LASER PHYSICS LETTERS | 2014年 / 11卷 / 06期

基金：

俄罗斯基础研究基金会;

关键词：

nanoantenna; femtosecond laser pulse; ultrafast electron photoemission; MOLECULAR-DYNAMICS; SURFACE; SPECTROSCOPY; GENERATION; TARGETS;

D O I：

10.1088/1612-2011/11/6/065301

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have demonstrated for the first time that an array of nanoantennas (central nanotips inside sub-micrometer pits) on an aluminum surface, fabricated using a specific double-pulse femtosecond laser irradiation scheme, results in a 28-fold enhancement of the non-linear (three-photon) electron photoemission yield, driven by a third intense IR femtosecond laser pulse. The supporting numerical electrodynamic modeling indicates that the electron emission is increased not owing to a larger effective aluminum surface, but due to instant local electromagnetic field enhancement near the nanoantenna, contributed by both the tip's 'lightning rod' effect and the focusing effect of the pit as a microreflector and annular edge as a plasmonic lens.

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