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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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,...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Group Polarization01:01

Group Polarization

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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Related Experiment Video

Updated: Jun 12, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
08:48

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Published on: September 25, 2020

Reflection polarizing holographic optical element for compact magnetooptical disk heads.

A Ohba, Y Kimura, S Sugama

    Applied Optics
    |June 26, 2010
    PubMed
    Summary

    A novel holographic optical element enhances compact magneto-optical disk heads by integrating polarizing beam splitting and signal detection. This innovation achieves a 57-dB carrier-to-noise ratio, proving its practical viability for data storage.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Compact magneto-optical (MO) disk heads require integrated optical elements for efficient data reading.
    • Existing optical systems often involve multiple components, increasing size and complexity.

    Purpose of the Study:

    • To develop a reflection polarizing holographic optical element (HOE) with a sinusoidal surface-relief structure for compact MO disk heads.
    • To integrate polarizing beam splitting, focusing, and tracking error signal detection functions into a single HOE.
    • To introduce a novel fabrication process for creating the sinusoidal surface-relief structure.

    Main Methods:

    • Development of a holographic optical element (HOE) with a sinusoidal surface-relief profile.
    • Photolithography-based fabrication process, including a method for converting rectangular profiles to sinusoidal ones.
    • High-fidelity replication using photopolymerization.
    • Integration and testing of the HOE in a magneto-optical disk head.

    Main Results:

    • Successful fabrication of a sinusoidal surface-relief HOE.
    • Demonstration of polarizing beam splitter, focusing, and tracking error signal detection functions.
    • Achieved a carrier-to-noise (C/N) ratio of 57 dB for a 1-MHz readout signal.
    • High replication fidelity was maintained during the photopolymerization process.

    Conclusions:

    • The developed reflection polarizing HOE is suitable for compact MO disk heads.
    • The novel fabrication process enables efficient production of sinusoidal surface-relief structures.
    • The achieved C/N ratio indicates practical usability for data readout applications.