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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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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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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
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Polarization effects in 3D vectorial-induced current reconstructions.

Christelle Eyraud, Rodolphe Vaillon, Amélie Litman

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    This summary is machine-generated.

    This study explores how polarization choices in scattering matrix elements affect 3D tomography imaging. Understanding these impacts is crucial for accurate reconstruction from truncated experimental data.

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    Area of Science:

    • Electromagnetics and Wave Propagation
    • Computational Imaging
    • Applied Physics

    Background:

    • Tomography algorithms rely on the complex amplitude scattering matrix as input.
    • For 3D targets, the scattering matrix includes vectorial information, requiring various polarization projections.
    • Experimental data often presents truncation issues.

    Purpose of the Study:

    • To investigate the impact of selecting specific scattering matrix elements on imaging results.
    • To analyze the influence of polarization choices on tomography reconstructions.
    • To understand the physical content of polarization terms in imaging.

    Main Methods:

    • Utilized a simple vectorial-induced current reconstruction algorithm.
    • Applied the algorithm to scaled models of aggregates.
    • Used experimental scattered fields acquired in the microwave frequency range.

    Main Results:

    • Demonstrated that specific polarization choices significantly influence imaging outcomes.
    • Qualitative maps of the scene were reconstructed, highlighting polarization-dependent features.
    • The study provides insights into the physical interpretation of different polarization terms.

    Conclusions:

    • Polarization selection is a critical factor in 3D tomography, especially with truncated data.
    • The findings aid in optimizing tomography algorithms for vectorial scattering information.
    • This research contributes to improved imaging of complex targets using microwave scattering data.