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High-harmonic generation by field enhanced femtosecond pulses in metal-sapphire nanostructure

Author

Listed:
  • Seunghwoi Han

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Hyunwoong Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Yong Woo Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Young-Jin Kim

    (School of Mechanical and Aerospace Engineering, Nanyang Technological University (NTU))

  • Seungchul Kim

    (Max Planck Center for Attosecond Science, Max Planck POSTECH/KOREA Res. Initiative)

  • In-Yong Park

    (Korea Research Institute of Standards and Science (KRISS))

  • Seung-Woo Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

Abstract

Plasmonic high-harmonic generation (HHG) drew attention as a means of producing coherent extreme ultraviolet (EUV) radiation by taking advantage of field enhancement occurring in metallic nanostructures. Here a metal-sapphire nanostructure is devised to provide a solid tip as the HHG emitter, replacing commonly used gaseous atoms. The fabricated solid tip is made of monocrystalline sapphire surrounded by a gold thin-film layer, and intended to produce EUV harmonics by the inter- and intra-band oscillations of electrons driven by the incident laser. The metal-sapphire nanostructure enhances the incident laser field by means of surface plasmon polaritons, triggering HHG directly from moderate femtosecond pulses of ∼0.1 TW cm−2 intensities. The measured EUV spectra exhibit odd-order harmonics up to ∼60 nm wavelengths without the plasma atomic lines typically seen when using gaseous atoms as the HHG emitter. This experimental outcome confirms that the plasmonic HHG approach is a promising way to realize coherent EUV sources for nano-scale near-field applications in spectroscopy, microscopy, lithography and atto-second physics.

Suggested Citation

  • Seunghwoi Han & Hyunwoong Kim & Yong Woo Kim & Young-Jin Kim & Seungchul Kim & In-Yong Park & Seung-Woo Kim, 2016. "High-harmonic generation by field enhanced femtosecond pulses in metal-sapphire nanostructure," Nature Communications, Nature, vol. 7(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13105
    DOI: 10.1038/ncomms13105
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