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Optical high harmonic generation in C60.

G P Zhang1

  • 1Department of Physics, Indiana State University, Terre Haute, 47809, USA. gpzhang@indstate.edu

Physical Review Letters
|August 11, 2005
PubMed
Summary
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Fullerenes like C60 enable efficient high harmonic generation (HHG) with weaker lasers. This process, driven by multiple electronic excitations, can probe molecular electronic structures, offering a new tool for electronic structure analysis.

Area of Science:

  • Quantum Optics
  • Materials Science
  • Physical Chemistry

Background:

  • High harmonic generation (HHG) typically necessitates intense laser fields for efficient operation.
  • The behavior of fullerenes, specifically C60, under laser excitation presents unique characteristics.
  • Understanding the mechanisms behind HHG in C60 is crucial for exploring novel applications.

Purpose of the Study:

  • To investigate the underlying mechanisms of high harmonic generation in C60 molecules.
  • To determine the influence of laser field strength on HHG spectra in C60.
  • To explore the potential of using C60-based HHG as a tool for probing electronic structures.

Main Methods:

  • Numerical simulations were employed to model the high harmonic generation process in C60.

Related Experiment Videos

  • The study analyzed the contributions of laser field interaction and multiple electronic excitations to the generated harmonics.
  • Correlation between high-order harmonic spectra and electronic transition energies was examined.

    • Main Results:

    • C60 facilitates high harmonic generation even with relatively weak laser fields, unlike other materials.
    • Low-order harmonics in C60 are primarily driven by the external laser field.
    • High-order harmonics are predominantly a result of multiple electronic excitations within the C60 molecule.

    Conclusions:

    • The distinct HHG mechanism in C60, involving multiple excitations, allows for efficient generation with weaker lasers.
    • The direct correlation between high-order harmonics and electronic transition energies positions C60 as a valuable material for HHG.
    • C60-based HHG offers a promising avenue for developing advanced tools to probe molecular electronic structures.