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Optical V(z) for high-resolution 2pi surface plasmon microscopy.

M G Somekh, S G Liu, T S Velinov

    Optics Letters
    |December 8, 2007
    PubMed
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    Surface plasmons, electromagnetic waves on surfaces, can be visualized using interferometry. This technique enables diffraction-limited surface plasmon microscopy for detailed surface analysis.

    Area of Science:

    • Physics
    • Optics
    • Materials Science

    Background:

    • Surface plasmons are electromagnetic surface waves confined to interfaces.
    • Their wave vectors exceed that of free-space light, posing challenges for direct far-field observation.

    Purpose of the Study:

    • To demonstrate a method for imaging surface plasmons in the far field.
    • To link surface plasmon propagation properties to observable output variations.

    Main Methods:

    • Utilizing an oil-immersion lens within an interferometer setup.
    • Exciting surface plasmons and analyzing output variations with defocus.

    Main Results:

    • The characteristic output variation is directly determined by surface plasmon propagation properties.

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  • Achieved diffraction-limited imaging of surface plasmons in the far field.

    • Conclusions:

    • Interferometric excitation and analysis provide a viable route for far-field surface plasmon microscopy.
    • This method allows for the characterization of surface plasmon propagation, enhancing nanoscale optical imaging.