Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces | Zendy

G. H. Welsh | Zendy; Klaas Wynne | Zendy

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Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces

Author(s) -

G. H. Welsh,

Klaas Wynne

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.002470

Subject(s) - terahertz radiation , optical rectification , surface plasmon , materials science , femtosecond , optics , ultrashort pulse , plasmon , terahertz spectroscopy and technology , excitation , laser , surface plasmon polariton , photomixing , ponderomotive force , optoelectronics , far infrared laser , nonlinear optics , physics , terahertz metamaterials , quantum mechanics

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.

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