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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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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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Related Experiment Video

Updated: Jan 25, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Integrated polarizer based on 45° tilted gratings.

Matthew T Posner, Nina Podoliak, Devin H Smith

    Optics Express
    |May 5, 2019
    PubMed
    Summary

    Researchers developed an integrated optical polarizer using 45° tilted gratings in planar waveguides. This device achieves a high polarization extinction ratio, crucial for optical communication systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Integrated optical devices are essential for modern telecommunications.
    • Polarizers are key components for controlling light polarization in optical systems.
    • Existing polarizers often face limitations in integration and performance.

    Purpose of the Study:

    • To report the first integrated implementation of a polarizer utilizing 45° tilted gratings in planar waveguides.
    • To demonstrate the fabrication and performance of this novel waveguide polarizer.
    • To provide a numerical and analytical understanding of the device architecture.

    Main Methods:

    • Fabrication of waveguides and gratings using direct UV writing in a hydrogenated germanium-doped silica-on-silicon chip.
    • Experimental characterization of the polarizer's performance, including polarization extinction ratio and wavelength dependence.
    • Numerical simulation and analytical modeling of the polarizer architecture.

    Main Results:

    • Achieved a polarization extinction ratio per unit length of 0.25 dB/mm.
    • Demonstrated minimal wavelength dependence (<0.3 dB) over the C band (1530-1570 nm) for a 20 mm device.
    • Numerical and analytical models showed good agreement with experimental data.

    Conclusions:

    • The developed integrated waveguide polarizer offers high performance and low wavelength dependency.
    • Direct UV writing is a viable fabrication method for such integrated optical components.
    • The study provides a validated design and analysis for future integrated photonic devices.