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Related Concept Videos

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Dynamically switchable self-focused thermal emission.

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    Researchers developed a microphotonic lens that focuses thermal emission at 4µm when heated above VO2

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Manipulating thermal emission is crucial for thermal management, sensing, and thermophotovoltaics.
    • Existing methods often lack precise control over thermal emission characteristics.

    Purpose of the Study:

    • To design and demonstrate a microphotonic lens for temperature-switchable self-focused thermal emission.
    • To achieve selective emission of focused infrared radiation at a specific wavelength.

    Main Methods:

    • Utilized the coupling between isotropic localized resonators and vanadium dioxide (VO2) phase change properties.
    • Designed a microphotonic lens structure.
    • Calculated thermal emission properties through direct simulation.

    Main Results:

    • The microphotonic lens selectively emits focused thermal radiation at 4µm above the VO2 phase transition temperature.
    • A clear focal spot was achieved at the designed focal length.
    • Focal plane intensity was 330 times lower below the phase transition temperature, demonstrating switchable focusing.

    Conclusions:

    • The developed microphotonic lens offers temperature-dependent control over focused thermal emission.
    • This technology has potential applications in thermal management, thermophotovoltaics, and advanced sensing.
    • Paves the way for novel contact-free sensing and on-chip infrared communication.