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Potential Due to a Polarized Object01:29

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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,...
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    Investigating evanescent optical fields in double-prism systems reveals they exhibit genuine 3D polarization states. Field properties at the second boundary depend on gap width, crucial for near-field optics applications.

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    Area of Science:

    • Optics
    • Photonics
    • Condensed Matter Physics

    Background:

    • Evanescent optical fields are crucial in near-field optics.
    • Frustrated total internal reflection (FTIR) enables optical tunneling between surfaces.
    • Polarization matrices characterize light polarization properties.

    Purpose of the Study:

    • To analyze the 3D polarimetric properties of evanescent fields in a double-prism system.
    • To investigate the influence of gap width on these properties.
    • To explore applications in near-field optics and surface nanophotonics.

    Main Methods:

    • Analysis of 3D polarimetric properties using a 3x3 polarization matrix decomposition.
    • Consideration of frustrated total internal reflection (FTIR) and optical tunneling.
    • Modeling of evanescent fields excited by random plane waves.

    Main Results:

    • Evanescent fields in the gap are always in a genuine 3D polarization state, regardless of incident wave polarization.
    • The 3D polarimetric properties at the second boundary are sensitive to gap width variations.
    • Significant effects are observed at smaller gap widths and larger angles of incidence.

    Conclusions:

    • This study reveals novel aspects of 3D evanescent field polarization.
    • The findings have potential applications in advanced near-field optical devices.
    • Understanding these properties is key for developing surface nanophotonic technologies.