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Direct backward third-harmonic generation in nanostructures.

Chieh-Feng Chang1, Hsing-Chao Chen, Miin-Jang Chen

  • 1Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan.

Optics Express
|April 15, 2010
PubMed
Summary

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Direct-backward third harmonic generation (DBTHG) is now shown to be significant. This study demonstrates DBTHG can be comparable to forward-THG in nanostructures, opening new avenues in nano-science.

Area of Science:

  • Nonlinear Optics
  • Nanophotonics
  • Materials Science

Background:

  • Third harmonic generation (THG) is a key nonlinear optical process.
  • Direct-backward THG (DBTHG) has been historically overlooked due to assumed negligible wave-vector mismatch.
  • Previous DBTHG signals were often misattributed to forward-THG (FTHG) back-reflections.

Purpose of the Study:

  • To theoretically and experimentally validate the existence and significance of direct-backward third harmonic generation (DBTHG).
  • To investigate the magnitude of DBTHG relative to FTHG in various nanostructures.
  • To develop efficient computational methods for DBTHG.

Main Methods:

  • Theoretical modeling using Green's function.
  • Experimental measurements of DBTHG in ZnO thin films, CdSe quantum dots, and Fe(3)O(4) nanoparticles.

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  • Derivation of an integral equation for fast DBTHG computation in nano films.

    • Main Results:

    • DBTHG was experimentally and theoretically demonstrated to be a significant phenomenon.
    • The magnitude of DBTHG was found to be comparable to FTHG in nanostructures.
    • Simulation results based on Green's function accurately predicted experimental DBTHG data.

    Conclusions:

    • DBTHG is a viable and significant nonlinear optical process, not negligible as previously thought.
    • DBTHG in nanostructures can be comparable in magnitude to FTHG.
    • DBTHG holds potential as a powerful tool in nano-science research, particularly when used alongside FTHG measurements.