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Proceedings Paper

Nanoplasmonic generation of ultrashort EUV pulses
Author(s): Joonhee Choi; Dong-Hyub Lee; Seunghwoi Han; In-Yong Park; Seungchul Kim; Seung-Woo Kim
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Paper Abstract

Ultrashort extreme-ultraviolet (EUV) light pulses are an important tool for time-resolved pump-probe spectroscopy to investigate the ultrafast dynamics of electrons in atoms and molecules. Among several methods available to generate ultrashort EUV light pulses, the nonlinear frequency upconversion process of high-harmonic generation (HHG) draws attention as it is capable of producing coherent EUV pulses with precise control of burst timing with respect to the driving near-infrared (NIR) femtosecond laser. In this report, we present and discuss our recent experimental data obtained by the plasmon-driven HHG method that generate EUV radiation by means of plasmonic nano-focusing of NIR femtosecond pulses. For experiment, metallic waveguides having a tapered hole of funnel shape inside were fabricated by adopting the focused-ion-beam process on a micro-cantilever substrate. The plasmonic field formed within the funnelwaveguides being coupled with the incident femtosecond pulse permitted intensity enhancement by a factor of ~350, which creates a hot spot of sub-wavelength size with intensities strong enough for HHG. Experimental results showed that with injection of noble gases into the funnel-waveguides, EUV radiation is generated up to wavelengths of 32 nm and 29.6 nm from Ar and Ne gas atoms, respectively. Further, it was observed that lower-order EUV harmonics are cut off in the HHG spectra by the tiny exit aperture of the funnel-waveguide.

Paper Details

Date Published: 9 October 2012
PDF: 7 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84571B (9 October 2012); doi: 10.1117/12.929403
Show Author Affiliations
Joonhee Choi, KAIST (Korea, Republic of)
Dong-Hyub Lee, KAIST (Korea, Republic of)
Seunghwoi Han, KAIST (Korea, Republic of)
In-Yong Park, KAIST (Korea, Republic of)
KRISS (Korea, Republic of)
Seungchul Kim, Max Planck Ctr. for Attosecond Science (Korea, Republic of)
Seung-Woo Kim, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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