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Microscopy Probes Dielectric Constant of Nanostructured Films

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Daniel S. Burgess

Using near-field scanning optical microscopy, researchers from Argonne National Laboratory in Illinois have imaged the interference patterns of surface plasmons on silver nanostructured thin films, enabling them to measure the local plasmon dispersion and decay length and thereby determine the frequency-dependent dielectric constant of the films. The disparity in the values of the dielectric constant as found in the study and as presented in optical handbooks underscores the importance of in situ experimental testing in the development of plasmonic devices for applications in sensing and...Read full article

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    Published: July 2006
    Glossary
    dielectric constant
    A number that indicates the magnitude of the shift in a solid of positive and negative charges in opposite directions when a voltage is applied across the solid.
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    Basic Sciencedielectric constantFeatureslocal plasmon dispersionMicroscopynanonear-field scanning optical microscopy

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