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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

1.6K
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
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Related Experiment Video

Updated: Nov 14, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Multiplexing multifoci optical metasurfaces for information encoding in the ultraviolet spectrum.

Jinpeng Huang, Xiang Gao, Zelin Hu

    Applied Optics
    |March 10, 2021
    PubMed
    Summary

    This study presents novel optical metasurfaces for ultraviolet information encoding. These multiplexing multifoci metasurfaces offer enhanced security through 1D and 2D data encryption modes.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Information Security

    Background:

    • Optical metasurfaces offer advanced control over light properties like phase, polarization, and amplitude.
    • Optical cryptography leverages light wavefront manipulation for secure information transmission.
    • Existing metasurface encoding methods are limited to 1D or 2D modes using wavelength or polarization.

    Purpose of the Study:

    • To demonstrate multiplexing multifoci optical metasurfaces for enhanced information encoding in the ultraviolet (UV) spectrum.
    • To achieve both 1D and 2D information encoding modes within the spatial domain.
    • To enhance the security of optical cryptography using UV light and metasurface properties.

    Main Methods:

    • Fabrication of high-aspect-ratio aluminum nitride nanorods.
    • Utilizing the Pancharatnam-Berry phase to introduce discontinuous phase shifts.
    • Designing metasurfaces for multifocal beam generation in the spatial zone.
    • Encoding information in both 1D (wavelength or polarization) and 2D (wavelength and polarization) modes.

    Main Results:

    • Successful demonstration of multiplexing multifoci optical metasurfaces.
    • Achieved information encoding in UV spectrum using both 1D and 2D modes.
    • Metasurfaces exhibit sensitivity to incident light helicity and UV wavelength.
    • Realization of multifoci generation in the spatial domain.

    Conclusions:

    • The developed optical metasurfaces provide a robust platform for secure information encoding in the UV spectrum.
    • The combination of multifoci generation, UV operation, and polarization sensitivity guarantees high security for encrypted information.
    • This technology holds significant promise for advancing optical cryptography and secure communication systems.