Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction

J. V. Ford, B. G. Sumpter, D. W. Noid, M. D. Barnes, J. U. Otaigbe

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    12 Scopus citations

    Abstract

    We show that fourth-order dispersion functions of solid-phase polymers can be determined by multicolor optical diffraction. Electrodynamically trapped microparticles of polyethylene glycol with different molecular weights were probed by two-dimensional optical diffraction with four different laser wavelengths (632.8, 514.5, 488.0, and 457.9 nm); subsequent Mie analysis of one-dimensional scattering patterns yielded size and refractive index (both real and imaginary parts). Using a single wavelength as a size reference, the nonlinear dependence of the refractive index of solid (nonevaporating) polymer microparticles was determined by finding the refractive index for a given wavelength that best matched a Mie calculation subject to the reference size constraint. The experimentally determined refractive index values were fit to a standard fourth-order Cauchy function to obtain values for n0, n1, and n2.

    Original languageEnglish
    Pages (from-to)2515-2517
    Number of pages3
    JournalApplied Physics Letters
    Volume77
    Issue number16
    DOIs
    StatePublished - Oct 16 2000

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