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Phase conjugation in amorphous selenium thin films.

E Haro-Poniatowski, M Fernandez-Guasti, S Camacho-Lopez

    Optics Letters
    |September 29, 2009
    PubMed
    Summary
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    Phase conjugation was achieved in amorphous selenium thin films, reaching 18% efficiency. Microscopic analysis confirmed amorphous selenium and thickness variations, though these alone don

    Area of Science:

    • Materials Science
    • Optics
    • Condensed Matter Physics

    Background:

    • Phase conjugation is a significant phenomenon in nonlinear optics.
    • Amorphous selenium thin films are explored for their optical properties.
    • Understanding light-matter interactions in these films is crucial for optical applications.

    Purpose of the Study:

    • To investigate and report phase conjugation in amorphous selenium thin films.
    • To quantify the maximum efficiency of the phase-conjugate signal.
    • To analyze the physical mechanisms responsible for the observed phase conjugation.

    Main Methods:

    • Utilized a 25-mW He-Ne laser to induce phase conjugation.
    • Recorded gratings with spatial frequencies of 275 lines/mm.

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  • Performed micro Raman spectroscopy and scanning electron microscopy (SEM) with profilometry.

    • Main Results:

    • Achieved a maximum phase-conjugate signal efficiency of 18%.
    • Micro Raman spectroscopy confirmed the presence of amorphous selenium in the grating lines.
    • SEM and profilometry revealed induced thickness variations in the film, but these were insufficient to fully explain the effect.

    Conclusions:

    • Phase conjugation is demonstrably present in amorphous selenium thin films.
    • The observed phenomenon is not solely attributable to surface relief or thickness variations.
    • Further investigation is needed to elucidate the precise mechanism behind the high efficiency phase conjugation in this material.