Uniqueness of determination of second-order nonlinear optical expansion coefficients of thin films

F.X. Wang, M. Siltanen, M. Kauranen

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)
    50 Downloads (Pure)

    Abstract

    Second-harmonic generation from surfaces and thin films can be described by up to three nonlinear expansion coefficients, which are associated with the quadratic combinations of the p- and s-polarized components of the fundamental beam and specific to the measured signal. It has been shown that the relative complex values of the coefficients can be uniquely determined by using a quarter-wave-plate to continuously vary the state of polarization of the fundamental beam [J. J. Maki, M. Kauranen, T. Verbiest, and A. Persoons, Phys. Rev. B 55, 5021 (1997)]. The proof is based on a specific and experimentally convenient initial state of polarization before the wave plate and on the assumption of the most general experimental situation where all three coefficients are nonvanishing, which implies that the sample or the experimental setup is chiral. We show both experimentally and theoretically that, surprisingly, the traditional experimental configuration fails in yielding unique values in a more specific, but common, achiral case. We identify new initial states of polarization that allow the coefficients to be uniquely determined even in the achiral case.
    Translated title of the contributionUniqueness of determination of second-order nonlinear optical expansion coefficients of thin films
    Original languageEnglish
    Pages (from-to)pp. 085428-1-6
    Number of pages6
    JournalPhysical Review B
    Issue number76
    DOIs
    Publication statusPublished - 2007
    Publication typeA1 Journal article-refereed

    Publication forum classification

    • Publication forum level 2

    Fingerprint

    Dive into the research topics of 'Uniqueness of determination of second-order nonlinear optical expansion coefficients of thin films'. Together they form a unique fingerprint.

    Cite this