Z-scan theoretical analysis for three-, four- and five-photon absorption

    Authors

    D. S. Correa; L. De Boni; L. Misoguti; I. Cohanoschi; F. E. Hernandez;C. R. Mendonca

    Comments

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    Abbreviated Journal Title

    Opt. Commun.

    Keywords

    NONLINEAR ABSORPTION; OPTICAL LIMITER; MEH-PPV; 2-PHOTON; FLUORESCENCE; ENHANCEMENT; INFORMATION; DERIVATIVES; MICROSCOPY; EXCITATION; Optics

    Abstract

    In this work. we report a theoretical analysis of three-, four- and five-photon absorption process using the open aperture Z-scan technique. The normalized transmittance equations presented here can be used to fit the experimental data, allowing the determination of material's multi-photon absorption cross-section. Through simulations, we observed the expected sharpening of the Z-scan curve for higher order nonlinear absorption. The normalized transmittance change as a function of the excitation irradiance displays distinct slopes for process with distinct number of photons, which can be used for determining the origin of the nonlinear processes. Optical limiting curves were also simulated for multi-photon absorption processes, demonstrating that high limiting thresholds occur for higher order processes. (c) 2007 Elsevier B.V. All rights reserved.

    Journal Title

    Optics Communications

    Volume

    277

    Issue/Number

    2

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    440

    Last Page

    445

    WOS Identifier

    WOS:000251791100036

    ISSN

    0030-4018

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