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Related Concept Videos

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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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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Related Experiment Video

Updated: Aug 16, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Coherence-induced depolarization effects in polarization singular beams.

Saba N Khan, Stuti Joshi, P Senthilkumaran

    Optics Letters
    |December 20, 2022
    PubMed
    Summary

    Coherence affects light polarization. C-point beams resist depolarization due to orbital angular momentum (OAM), preserving their polarization vortex structure even with reduced spatial coherence.

    Area of Science:

    • Optics and Photonics
    • Quantum Information Science
    • Electromagnetism

    Background:

    • Polarization singularities, such as C-points and V-points, are crucial features in light polarization.
    • The interplay between spatial coherence and polarization properties of light beams is an active area of research.

    Purpose of the Study:

    • To investigate coherence-induced depolarization effects in polarization singular beams.
    • To analyze the influence of spatial coherence length, singularity index, and orbital angular momentum (OAM) on beam properties.

    Main Methods:

    • Theoretical modeling of polarization singular beams.
    • Experimental verification using optical setups to control and measure beam properties.
    • Analysis of irradiance profiles and degree of polarization (DoP) distributions.

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    Main Results:

    • Spatial coherence length significantly governs irradiance and DoP distributions.
    • V-point beams show uniform DoP deterioration with reduced coherence.
    • C-point beams exhibit anti-depolarization near the core, preserving the polarization vortex structure due to non-zero net OAM.

    Conclusions:

    • C-point beams demonstrate resilience to depolarization, offering potential for robust polarization control.
    • The findings highlight the critical role of OAM in maintaining polarization integrity under varying coherence conditions.
    • This research provides insights into the fundamental physics of light polarization and its applications.