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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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 the...

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Published on: July 25, 2022

Multimodal multiplex spectroscopy using photonic crystals.

Zhaochun Xu, Zhanglei Wang, Michael Sullivan

    Optics Express
    |May 26, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Disordered photonic crystals enable high-resolution optical spectrometers. These devices offer efficient spectral analysis for diffuse sources, paving the way for advanced optical sensing applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Low coherence fields interact with disordered photonic crystals.
    • Photonic crystals offer unique spatio-spectral transmission properties.

    Purpose of the Study:

    • To investigate the use of disordered photonic crystals for optical spectrometer construction.
    • To evaluate the feasibility of creating high-resolution, multimodal spectrometers for diffuse source analysis.

    Main Methods:

    • Utilizing spatio-spectral transmission patterns from disordered photonic crystals.
    • Mounting a photonic crystal on a focal plane array for experimental analysis.

    Main Results:

    • Demonstrated the potential for 1-10 nm resolution multimodal spectrometers.
    • Showcased high efficiency spectral analysis of diffuse sources.
    • Highlighted the relative independence of spatial and spectral modal response in photonic crystals.

    Conclusions:

    • Disordered photonic crystals are suitable for constructing advanced optical spectrometers.
    • The developed spectrometers enable efficient analysis of diffuse light sources.
    • The technology holds promise for improved optical sensing and spectral analysis.