Generation of isolated attosecond pulses using a plasmonic funnel-waveguide

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We theoretically investigated the possibility of generating attosecond pulses by means of plasmonic field enhancement induced in a nanostructured metallic funnel-waveguide. This study was motivated by our recent experimental demonstration of ultrashort extreme-ultraviolet (EUV) pulses using the same type of three-dimensional waveguides. Here, with emphasis on generation of isolated attosecond pulses, the finite-domain time-difference method was used to analyze the funnel-waveguide with respect to the geometry-dependent plasmonic features such as the field enhancement factor, enhanced plasmonic field profile and hot-spot location. Then an extended semi-classical model of high-order harmonic generation was adopted to predict the EUV spectra generated from the funnel-waveguide in consideration of the spatial inhomogeneity of the plasmonic field within the hot-spot volume. Our simulation finally proved that isolated attosecond pulses can be produced at fast repetition rates directly from a few-cycle femtosecond laser or by synthesizing a two-color laser consisting of two multi-cycle pulses of cross-polarized configuration.
Publisher
IOP PUBLISHING LTD
Issue Date
2012-10
Language
English
Article Type
Article
Keywords

HIGH-HARMONIC-GENERATION; EXTREME-ULTRAVIOLET; REPETITION RATE; FREQUENCY COMB; ENHANCEMENT; ENERGY; MHZ

Citation

NEW JOURNAL OF PHYSICS, v.14

ISSN
1367-2630
DOI
10.1088/1367-2630/14/10/103038
URI
http://hdl.handle.net/10203/102506
Appears in Collection
ME-Journal Papers(저널논문)
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