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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

645
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
645

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Related Experiment Video

Updated: Dec 13, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

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Published on: July 21, 2018

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Polarization-contrast surface plasmon imaging.

Yevgeniy Mikhyeyev, Ribal Georges Sabat

    Optics Express
    |August 6, 2020
    PubMed
    Summary

    Silver-coated gratings detect refractive index changes in solutions using Surface Plasmon Resonance (SPR). This polarization-contrast method enables imaging of inhomogeneous mixtures like water and oil.

    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Optical sensing

    Background:

    • Surface Plasmon Resonance (SPR) is a label-free optical technique used for detecting changes in refractive index.
    • Crossed Surface Relief Gratings (CSRGs) offer unique optical properties for manipulating surface plasmons.

    Purpose of the Study:

    • To develop and demonstrate a novel imaging technique for localized refractive index variations.
    • To utilize polarization-contrast Surface Plasmon Resonance (SPR) with CSRGs for enhanced sensitivity and imaging capabilities.

    Main Methods:

    • Fabrication of silver-coated CSRGs.
    • Utilizing crossed polarizers and a monochromatic light source.
    • Acquisition of polarization-contrast microscopy images of sample solutions.

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    Multimodal Analytical Platform on a Multiplexed Surface Plasmon Resonance Imaging Chip for the Analysis of Extracellular Vesicle Subsets
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    Related Experiment Videos

    Last Updated: Dec 13, 2025

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    Main Results:

    • Incident light intensity directly correlated with local refractive index values.
    • In-plane polarization conversion of SPR light by orthogonal grating vectors.
    • Successful imaging of a water and silicon oil mixture using the developed SPR-CSRG system.

    Conclusions:

    • Silver-coated CSRGs enable sensitive detection and imaging of refractive index variations.
    • Polarization-contrast SPR with CSRGs provides a powerful tool for analyzing inhomogeneous solutions.
    • This technique offers a promising approach for label-free optical microscopy and sensing.