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Related Experiment Videos

Green's function for a sharpened and metal-coated dielectric probe.

Vineet Khullar, Gong Gu, Ali Passian

    Applied Optics
    |April 1, 2018
    PubMed
    Summary

    This study presents an analytical model for apertureless scanning-probe optical microscopy. The model simplifies probe-sample interactions, enabling examination of field enhancements for improved nanoscale imaging.

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    Area of Science:

    • Physics
    • Optical Microscopy
    • Nanotechnology

    Background:

    • Apertureless scanning-probe optical microscopy utilizes probe-sample interactions for imaging.
    • Traditional probes often use metal coatings near the tip for enhanced optical effects.
    • Near-field interactions are crucial for high-resolution imaging in these techniques.

    Purpose of the Study:

    • To develop an analytical model for apertureless scanning-probe optical microscopy.
    • To approximate near-field interactions using quasi-electrostatic analytics.
    • To analytically examine field enhancements at the probe tip.

    Main Methods:

    • Modeling the coated probe as a hyperboloid of revolution.
    • Applying quasi-electrostatic approximations in the near-field region.

    Related Experiment Videos

  • Solving Laplace's equation and Green's function with boundary conditions.

    • Main Results:

    • An analytical solution for resonance effects on the probe tip was obtained.
    • The model accurately approximates near-field interactions.
    • Large field enhancements due to tip sharpness and surface plasmons can be analytically studied.

    Conclusions:

    • The developed analytical model offers a simplified yet accurate approach for apertureless scanning-probe optical microscopy.
    • This method facilitates the examination of field enhancements crucial for nanoscale optical imaging.
    • The findings contribute to the theoretical understanding and practical application of advanced microscopy techniques.