Abstract

We use surface-plasmon resonance in a silver film to obtain high-resolution real-time images of a transparent dielectric sample in contact with it. A new aspect of the work was the use of radially polarized illumination from a LED at $530\mathrm{nm}$ to obtain speckle-free images with high spatial resolution along all orientations. The sensitivity to refractive index changes in the sample is estimated to be better than ${10}^{-3}$, and the modulation transfer function out to spatial frequency $1{\mu \mathrm{m}}^{-1}$ was measured.

© 2008 Optical Society of America

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