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Related Concept Videos

Group Polarization01:01

Group Polarization

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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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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Related Experiment Video

Updated: Jan 1, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Polarization-selective waveguide holography in the visible spectrum.

Zhiqin Huang, Daniel L Marks, David R Smith

    Optics Express
    |December 28, 2019
    PubMed
    Summary

    We developed a new waveguide hologram using metamaterials that can display two independent images with different polarizations. This technology enables 3D stereoscopic images and vortex beams for applications like augmented reality.

    Area of Science:

    • Photonics
    • Metamaterials
    • Holography

    Background:

    • Traditional holograms lack polarization selectivity, limiting their applications.
    • Integrated photonic devices require advanced holographic functionalities.

    Purpose of the Study:

    • To demonstrate a polarization-selective waveguide hologram.
    • To enable independent holographic image generation using orthogonal polarizations.

    Main Methods:

    • Utilized an all-dielectric metamaterial multilayer system.
    • Employed binary computer-generated holograms (CGH) with orthogonally polarized beams.
    • Used fundamental and higher-order TM and TE modes in an optical waveguide.

    Main Results:

    • Achieved spatially separated or overlapped holographic images with two orthogonal polarizations.

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  • Demonstrated the combination of images for 3D stereoscopic viewing.
  • Showcased the construction of radially and azimuthally polarized vortex beams.
  • Confirmed distinct propagation constants for guided waves, enabling image separation.

    • Conclusions:

    • Polarization-selective waveguide holograms offer versatile functionalities for integrated photonics.
    • This technology paves the way for advanced applications in chip-scale displays, augmented reality, and optical trapping.